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Allow NOT NULL constraints to be added as NOT VALID

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This allows them to be added without scanning the table, and validating
them afterwards without holding access exclusive lock on the table after
any violating rows have been deleted or fixed.

Doing ALTER TABLE ... SET NOT NULL for a column that has an invalid
not-null constraint validates that constraint.  ALTER TABLE .. VALIDATE
CONSTRAINT is also supported.  There are various checks on whether an
invalid constraint is allowed in a child table when the parent table has
a valid constraint; this should match what we do for enforced/not
enforced constraints.

pg_attribute.attnotnull is now only an indicator for whether a not-null
constraint exists for the column; whether it's valid or invalid must be
queried in pg_constraint.  Applications can continue to query
pg_attribute.attnotnull as before, but now it's possible that NULL rows
are present in the column even when that's set to true.

For backend internal purposes, we cache the nullability status in
CompactAttribute->attnullability that each tuple descriptor carries
(replacing CompactAttribute.attnotnull, which was a mirror of
Form_pg_attribute.attnotnull).  During the initial tuple descriptor
creation, based on the pg_attribute scan, we set this to UNRESTRICTED if
pg_attribute.attnotnull is false, or to UNKNOWN if it's true; then we
update the latter to VALID or INVALID depending on the pg_constraint
scan.  This flag is also copied when tupledescs are copied.

Comparing tuple descs for equality must also compare the
CompactAttribute.attnullability flag and return false in case of a
mismatch.

pg_dump deals with these constraints by storing the OIDs of invalid
not-null constraints in a separate array, and running a query to obtain
their properties.  The regular table creation SQL omits them entirely.
They are then dealt with in the same way as "separate" CHECK
constraints, and dumped after the data has been loaded.  Because no
additional pg_dump infrastructure was required, we don't bump its
version number.

I decided not to bump catversion either, because the old catalog state
works perfectly in the new world.  (Trying to run with new catalog state
and the old server version would likely run into issues, however.)

System catalogs do not support invalid not-null constraints (because
commit 14e87ffa5c54 didn't allow them to have pg_constraint rows
anyway.)

Author: Rushabh Lathia <rushabh.lathia@gmail.com>
Author: Jian He <jian.universality@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Tested-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Discussion: https://postgr.es/m/CAGPqQf0KitkNack4F5CFkFi-9Dqvp29Ro=EpcWt=4_hs-Rt+bQ@mail.gmail.com
This commit is contained in:
Álvaro Herrera 2025-04-07 19:19:50 +02:00
parent b52a4a5f28
commit a379061a22
No known key found for this signature in database
GPG Key ID: 1C20ACB9D5C564AE
21 changed files with 1109 additions and 111 deletions
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2
doc/src/sgml/catalogs.sgml
View File

@ -1260,7 +1260,7 @@
<structfield>attnotnull</structfield> <type>bool</type>
</para>
<para>
This column has a not-null constraint.
This column has a (possibly invalid) not-null constraint.
</para></entry>
</row>

8
doc/src/sgml/ref/alter_table.sgml
View File

@ -243,6 +243,8 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
entire table; however, if a valid <literal>CHECK</literal> constraint is
found which proves no <literal>NULL</literal> can exist, then the
table scan is skipped.
If a column has an invalid not-null constraint,
<literal>SET NOT NULL</literal> validates it.
</para>
<para>
@ -458,8 +460,8 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
<para>
This form adds a new constraint to a table using the same constraint
syntax as <link linkend="sql-createtable"><command>CREATE TABLE</command></link>, plus the option <literal>NOT
VALID</literal>, which is currently only allowed for foreign key
and CHECK constraints.
VALID</literal>, which is currently only allowed for foreign key,
<literal>CHECK</literal> constraints and not-null constraints.
</para>
<para>
@ -586,7 +588,7 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
<term><literal>VALIDATE CONSTRAINT</literal></term>
<listitem>
<para>
This form validates a foreign key or check constraint that was
This form validates a foreign key, check, or not-null constraint that was
previously created as <literal>NOT VALID</literal>, by scanning the
table to ensure there are no rows for which the constraint is not
satisfied. If the constraint is not enforced, an error is thrown.

38
src/backend/access/common/tupdesc.c
View File

@ -22,6 +22,7 @@
#include "access/htup_details.h"
#include "access/toast_compression.h"
#include "access/tupdesc_details.h"
#include "catalog/catalog.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_type.h"
#include "common/hashfn.h"
@ -74,7 +75,16 @@ populate_compact_attribute_internal(Form_pg_attribute src,
dst->atthasmissing = src->atthasmissing;
dst->attisdropped = src->attisdropped;
dst->attgenerated = (src->attgenerated != '\0');
dst->attnotnull = src->attnotnull;
/*
* Assign nullability status for this column. Assuming that a constraint
* exists, at this point we don't know if a not-null constraint is valid,
* so we assign UNKNOWN unless the table is a catalog, in which case we
* know it's valid.
*/
dst->attnullability = !src->attnotnull ? ATTNULLABLE_UNRESTRICTED :
IsCatalogRelationOid(src->attrelid) ? ATTNULLABLE_VALID :
ATTNULLABLE_UNKNOWN;
switch (src->attalign)
{
@ -144,9 +154,10 @@ verify_compact_attribute(TupleDesc tupdesc, int attnum)
/*
* Make the attcacheoff match since it's been reset to -1 by
* populate_compact_attribute_internal.
* populate_compact_attribute_internal. Same with attnullability.
*/
tmp.attcacheoff = cattr->attcacheoff;
tmp.attnullability = cattr->attnullability;
/* Check the freshly populated CompactAttribute matches the TupleDesc's */
Assert(memcmp(&tmp, cattr, sizeof(CompactAttribute)) == 0);
@ -333,8 +344,13 @@ CreateTupleDescCopyConstr(TupleDesc tupdesc)
desc->natts * sizeof(FormData_pg_attribute));
for (i = 0; i < desc->natts; i++)
{
populate_compact_attribute(desc, i);
TupleDescCompactAttr(desc, i)->attnullability =
TupleDescCompactAttr(tupdesc, i)->attnullability;
}
/* Copy the TupleConstr data structure, if any */
if (constr)
{
@ -613,6 +629,24 @@ equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2)
return false;
if (attr1->attnotnull != attr2->attnotnull)
return false;
/*
* When the column has a not-null constraint, we also need to consider
* its validity aspect, which only manifests in CompactAttribute->
* attnullability, so verify that.
*/
if (attr1->attnotnull)
{
CompactAttribute *cattr1 = TupleDescCompactAttr(tupdesc1, i);
CompactAttribute *cattr2 = TupleDescCompactAttr(tupdesc2, i);
Assert(cattr1->attnullability != ATTNULLABLE_UNKNOWN);
Assert((cattr1->attnullability == ATTNULLABLE_UNKNOWN) ==
(cattr2->attnullability == ATTNULLABLE_UNKNOWN));
if (cattr1->attnullability != cattr2->attnullability)
return false;
}
if (attr1->atthasdef != attr2->atthasdef)
return false;
if (attr1->attidentity != attr2->attidentity)

9
src/backend/catalog/heap.c
View File

@ -2616,12 +2616,17 @@ AddRelationNewConstraints(Relation rel,
errmsg("cannot add not-null constraint on system column \"%s\"",
strVal(linitial(cdef->keys))));
Assert(cdef->initially_valid != cdef->skip_validation);
/*
* If the column already has a not-null constraint, we don't want
* to add another one; just adjust inheritance status as needed.
* to add another one; adjust inheritance status as needed. This
* also checks whether the existing constraint matches the
* requested validity.
*/
if (AdjustNotNullInheritance(RelationGetRelid(rel), colnum,
is_local, cdef->is_no_inherit))
is_local, cdef->is_no_inherit,
cdef->skip_validation))
continue;
/*

46
src/backend/catalog/pg_constraint.c
View File

@ -576,8 +576,8 @@ ChooseConstraintName(const char *name1, const char *name2,
/*
* Find and return a copy of the pg_constraint tuple that implements a
* validated not-null constraint for the given column of the given relation.
* If no such constraint exists, return NULL.
* (possibly not valid) not-null constraint for the given column of the
* given relation. If no such constraint exists, return NULL.
*
* XXX This would be easier if we had pg_attribute.notnullconstr with the OID
* of the constraint that implements the not-null constraint for that column.
@ -606,13 +606,11 @@ findNotNullConstraintAttnum(Oid relid, AttrNumber attnum)
AttrNumber conkey;
/*
* We're looking for a NOTNULL constraint that's marked validated,
* with the column we're looking for as the sole element in conkey.
* We're looking for a NOTNULL constraint with the column we're
* looking for as the sole element in conkey.
*/
if (con->contype != CONSTRAINT_NOTNULL)
continue;
if (!con->convalidated)
continue;
conkey = extractNotNullColumn(conTup);
if (conkey != attnum)
@ -630,9 +628,10 @@ findNotNullConstraintAttnum(Oid relid, AttrNumber attnum)
}
/*
* Find and return the pg_constraint tuple that implements a validated
* not-null constraint for the given column of the given relation. If
* no such column or no such constraint exists, return NULL.
* Find and return a copy of the pg_constraint tuple that implements a
* (possibly not valid) not-null constraint for the given column of the
* given relation.
* If no such column or no such constraint exists, return NULL.
*/
HeapTuple
findNotNullConstraint(Oid relid, const char *colname)
@ -723,15 +722,19 @@ extractNotNullColumn(HeapTuple constrTup)
*
* If no not-null constraint is found for the column, return false.
* Caller can create one.
*
* If a constraint exists but the connoinherit flag is not what the caller
* wants, throw an error about the incompatibility. Otherwise, we adjust
* conislocal/coninhcount and return true.
* In the latter case, if is_local is true we flip conislocal true, or do
* nothing if it's already true; otherwise we increment coninhcount by 1.
* wants, throw an error about the incompatibility. If the desired
* constraint is valid but the existing constraint is not valid, also
* throw an error about that (the opposite case is acceptable).
*
* If everything checks out, we adjust conislocal/coninhcount and return
* true. If is_local is true we flip conislocal true, or do nothing if
* it's already true; otherwise we increment coninhcount by 1.
*/
bool
AdjustNotNullInheritance(Oid relid, AttrNumber attnum,
bool is_local, bool is_no_inherit)
bool is_local, bool is_no_inherit, bool is_notvalid)
{
HeapTuple tup;
@ -755,6 +758,17 @@ AdjustNotNullInheritance(Oid relid, AttrNumber attnum,
errmsg("cannot change NO INHERIT status of NOT NULL constraint \"%s\" on relation \"%s\"",
NameStr(conform->conname), get_rel_name(relid)));
/*
* Throw an error if the existing constraint is NOT VALID and caller
* wants a valid one.
*/
if (!is_notvalid && !conform->convalidated)
ereport(ERROR,
errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("incompatible NOT VALID constraint \"%s\" on relation \"%s\"",
NameStr(conform->conname), get_rel_name(relid)),
errhint("You will need to use ALTER TABLE ... VALIDATE CONSTRAINT to validate it."));
if (!is_local)
{
if (pg_add_s16_overflow(conform->coninhcount, 1,
@ -832,7 +846,7 @@ RelationGetNotNullConstraints(Oid relid, bool cooked, bool include_noinh)
cooked->attnum = colnum;
cooked->expr = NULL;
cooked->is_enforced = true;
cooked->skip_validation = false;
cooked->skip_validation = !conForm->convalidated;
cooked->is_local = true;
cooked->inhcount = 0;
cooked->is_no_inherit = conForm->connoinherit;
@ -852,7 +866,7 @@ RelationGetNotNullConstraints(Oid relid, bool cooked, bool include_noinh)
constr->keys = list_make1(makeString(get_attname(relid, colnum,
false)));
constr->is_enforced = true;
constr->skip_validation = false;
constr->skip_validation = !conForm->convalidated;
constr->initially_valid = true;
constr->is_no_inherit = conForm->connoinherit;
notnulls = lappend(notnulls, constr);

271
src/backend/commands/tablecmds.c
View File

@ -435,6 +435,9 @@ static void QueueFKConstraintValidation(List **wqueue, Relation conrel, Relation
static void QueueCheckConstraintValidation(List **wqueue, Relation conrel, Relation rel,
char *constrName, HeapTuple contuple,
bool recurse, bool recursing, LOCKMODE lockmode);
static void QueueNNConstraintValidation(List **wqueue, Relation conrel, Relation rel,
HeapTuple contuple, bool recurse, bool recursing,
LOCKMODE lockmode);
static int transformColumnNameList(Oid relId, List *colList,
int16 *attnums, Oid *atttypids, Oid *attcollids);
static int transformFkeyGetPrimaryKey(Relation pkrel, Oid *indexOid,
@ -498,7 +501,7 @@ static void add_column_collation_dependency(Oid relid, int32 attnum, Oid collid)
static ObjectAddress ATExecDropNotNull(Relation rel, const char *colName, bool recurse,
LOCKMODE lockmode);
static void set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
LOCKMODE lockmode);
bool is_valid, bool queue_validation);
static ObjectAddress ATExecSetNotNull(List **wqueue, Relation rel,
char *constrname, char *colName,
bool recurse, bool recursing,
@ -1340,7 +1343,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
nncols = AddRelationNotNullConstraints(rel, stmt->nnconstraints,
old_notnulls);
foreach_int(attrnum, nncols)
set_attnotnull(NULL, rel, attrnum, NoLock);
set_attnotnull(NULL, rel, attrnum, true, false);
ObjectAddressSet(address, RelationRelationId, relationId);
@ -2738,7 +2741,7 @@ MergeAttributes(List *columns, const List *supers, char relpersistence,
/*
* Request attnotnull on columns that have a not-null constraint
* that's not marked NO INHERIT.
* that's not marked NO INHERIT (even if not valid).
*/
nnconstrs = RelationGetNotNullConstraints(RelationGetRelid(relation),
true, false);
@ -6207,24 +6210,28 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
{
/*
* If we are rebuilding the tuples OR if we added any new but not
* verified not-null constraints, check all not-null constraints. This
* is a bit of overkill but it minimizes risk of bugs.
* verified not-null constraints, check all *valid* not-null
* constraints. This is a bit of overkill but it minimizes risk of
* bugs.
*
* notnull_attrs does *not* collect attribute numbers for not-null
* constraints over virtual generated columns; instead, they are
* collected in notnull_virtual_attrs.
* notnull_attrs does *not* collect attribute numbers for valid
* not-null constraints over virtual generated columns; instead, they
* are collected in notnull_virtual_attrs for verification elsewhere.
*/
for (i = 0; i < newTupDesc->natts; i++)
{
Form_pg_attribute attr = TupleDescAttr(newTupDesc, i);
CompactAttribute *attr = TupleDescCompactAttr(newTupDesc, i);
if (attr->attnotnull && !attr->attisdropped)
if (attr->attnullability == ATTNULLABLE_VALID &&
!attr->attisdropped)
{
if (attr->attgenerated != ATTRIBUTE_GENERATED_VIRTUAL)
notnull_attrs = lappend_int(notnull_attrs, attr->attnum);
Form_pg_attribute wholeatt = TupleDescAttr(newTupDesc, i);
if (wholeatt->attgenerated != ATTRIBUTE_GENERATED_VIRTUAL)
notnull_attrs = lappend_int(notnull_attrs, wholeatt->attnum);
else
notnull_virtual_attrs = lappend_int(notnull_virtual_attrs,
attr->attnum);
wholeatt->attnum);
}
}
if (notnull_attrs || notnull_virtual_attrs)
@ -7809,18 +7816,23 @@ ATExecDropNotNull(Relation rel, const char *colName, bool recurse,
}
/*
* Helper to set pg_attribute.attnotnull if it isn't set, and to tell phase 3
* to verify it.
* set_attnotnull
* Helper to update/validate the pg_attribute status of a not-null
* constraint
*
* When called to alter an existing table, 'wqueue' must be given so that we
* can queue a check that existing tuples pass the constraint. When called
* from table creation, 'wqueue' should be passed as NULL.
* pg_attribute.attnotnull is set true, if it isn't already.
* If queue_validation is true, also set up wqueue to validate the constraint.
* wqueue may be given as NULL when validation is not needed (e.g., on table
* creation).
*/
static void
set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
LOCKMODE lockmode)
bool is_valid, bool queue_validation)
{
Form_pg_attribute attr;
CompactAttribute *thisatt;
Assert(!queue_validation || wqueue);
CheckAlterTableIsSafe(rel);
@ -7844,8 +7856,11 @@ set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
elog(ERROR, "cache lookup failed for attribute %d of relation %u",
attnum, RelationGetRelid(rel));
thisatt = TupleDescCompactAttr(RelationGetDescr(rel), attnum - 1);
thisatt->attnullability = ATTNULLABLE_VALID;
attr = (Form_pg_attribute) GETSTRUCT(tuple);
Assert(!attr->attnotnull);
attr->attnotnull = true;
CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
@ -7853,7 +7868,8 @@ set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
* If the nullness isn't already proven by validated constraints, have
* ALTER TABLE phase 3 test for it.
*/
if (wqueue && !NotNullImpliedByRelConstraints(rel, attr))
if (queue_validation && wqueue &&
!NotNullImpliedByRelConstraints(rel, attr))
{
AlteredTableInfo *tab;
@ -7866,6 +7882,10 @@ set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
table_close(attr_rel, RowExclusiveLock);
heap_freetuple(tuple);
}
else
{
CacheInvalidateRelcache(rel);
}
}
/*
@ -7951,6 +7971,15 @@ ATExecSetNotNull(List **wqueue, Relation rel, char *conName, char *colName,
conForm->conislocal = true;
changed = true;
}
else if (!conForm->convalidated)
{
/*
* Flip attnotnull and convalidated, and also validate the
* constraint.
*/
return ATExecValidateConstraint(wqueue, rel, NameStr(conForm->conname),
recurse, recursing, lockmode);
}
if (changed)
{
@ -8013,8 +8042,8 @@ ATExecSetNotNull(List **wqueue, Relation rel, char *conName, char *colName,
InvokeObjectPostAlterHook(RelationRelationId,
RelationGetRelid(rel), attnum);
/* Mark pg_attribute.attnotnull for the column */
set_attnotnull(wqueue, rel, attnum, lockmode);
/* Mark pg_attribute.attnotnull for the column and queue validation */
set_attnotnull(wqueue, rel, attnum, true, true);
/*
* Recurse to propagate the constraint to children that don't have one.
@ -9417,7 +9446,6 @@ ATPrepAddPrimaryKey(List **wqueue, Relation rel, AlterTableCmd *cmd,
bool recurse, LOCKMODE lockmode,
AlterTableUtilityContext *context)
{
ListCell *lc;
Constraint *pkconstr;
pkconstr = castNode(Constraint, cmd->def);
@ -9436,33 +9464,73 @@ ATPrepAddPrimaryKey(List **wqueue, Relation rel, AlterTableCmd *cmd,
lockmode);
foreach_oid(childrelid, children)
{
foreach(lc, pkconstr->keys)
foreach_node(String, attname, pkconstr->keys)
{
HeapTuple tup;
Form_pg_attribute attrForm;
char *attname = strVal(lfirst(lc));
tup = SearchSysCacheAttName(childrelid, attname);
tup = SearchSysCacheAttName(childrelid, strVal(attname));
if (!tup)
elog(ERROR, "cache lookup failed for attribute %s of relation %u",
attname, childrelid);
strVal(attname), childrelid);
attrForm = (Form_pg_attribute) GETSTRUCT(tup);
if (!attrForm->attnotnull)
ereport(ERROR,
errmsg("column \"%s\" of table \"%s\" is not marked NOT NULL",
attname, get_rel_name(childrelid)));
strVal(attname), get_rel_name(childrelid)));
ReleaseSysCache(tup);
}
}
}
/* Insert not-null constraints in the queue for the PK columns */
foreach(lc, pkconstr->keys)
/* Verify that columns are not-null, or request that they be made so */
foreach_node(String, column, pkconstr->keys)
{
AlterTableCmd *newcmd;
Constraint *nnconstr;
HeapTuple tuple;
nnconstr = makeNotNullConstraint(lfirst(lc));
/*
* First check if a suitable constraint exists. If it does, we don't
* need to request another one. We do need to bail out if it's not
* valid, though.
*/
tuple = findNotNullConstraint(RelationGetRelid(rel), strVal(column));
if (tuple != NULL)
{
Form_pg_constraint conForm = (Form_pg_constraint) GETSTRUCT(tuple);
/* a NO INHERIT constraint is no good */
if (conForm->connoinherit)
ereport(ERROR,
errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("cannot create primary key on column \"%s\"",
strVal(column)),
/*- translator: third %s is a constraint characteristic such as NOT VALID */
errdetail("The constraint \"%s\" on column \"%s\", marked %s, is incompatible with a primary key.",
NameStr(conForm->conname), strVal(column), "NO INHERIT"),
errhint("You will need to make it inheritable using %s.",
"ALTER TABLE ... ALTER CONSTRAINT ... INHERIT"));
/* an unvalidated constraint is no good */
if (!conForm->convalidated)
ereport(ERROR,
errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("cannot create primary key on column \"%s\"",
strVal(column)),
/*- translator: third %s is a constraint characteristic such as NOT VALID */
errdetail("The constraint \"%s\" on column \"%s\", marked %s, is incompatible with a primary key.",
NameStr(conForm->conname), strVal(column), "NOT VALID"),
errhint("You will need to validate it using %s.",
"ALTER TABLE ... VALIDATE CONSTRAINT"));
/* All good with this one; don't request another */
heap_freetuple(tuple);
continue;
}
/* This column is not already not-null, so add it to the queue */
nnconstr = makeNotNullConstraint(column);
newcmd = makeNode(AlterTableCmd);
newcmd->subtype = AT_AddConstraint;
@ -9836,11 +9904,15 @@ ATAddCheckNNConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
constr->conname = ccon->name;
/*
* If adding a not-null constraint, set the pg_attribute flag and tell
* phase 3 to verify existing rows, if needed.
* If adding a valid not-null constraint, set the pg_attribute flag
* and tell phase 3 to verify existing rows, if needed. For an
* invalid constraint, just set attnotnull, without queueing
* verification.
*/
if (constr->contype == CONSTR_NOTNULL)
set_attnotnull(wqueue, rel, ccon->attnum, lockmode);
set_attnotnull(wqueue, rel, ccon->attnum,
!constr->skip_validation,
!constr->skip_validation);
ObjectAddressSet(address, ConstraintRelationId, ccon->conoid);
}
@ -12811,11 +12883,12 @@ ATExecValidateConstraint(List **wqueue, Relation rel, char *constrName,
con = (Form_pg_constraint) GETSTRUCT(tuple);
if (con->contype != CONSTRAINT_FOREIGN &&
con->contype != CONSTRAINT_CHECK)
con->contype != CONSTRAINT_CHECK &&
con->contype != CONSTRAINT_NOTNULL)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("constraint \"%s\" of relation \"%s\" is not a foreign key or check constraint",
constrName, RelationGetRelationName(rel))));
errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("constraint \"%s\" of relation \"%s\" is not a foreign key, check, or not-null constraint",
constrName, RelationGetRelationName(rel)));
if (!con->conenforced)
ereport(ERROR,
@ -12833,6 +12906,11 @@ ATExecValidateConstraint(List **wqueue, Relation rel, char *constrName,
QueueCheckConstraintValidation(wqueue, conrel, rel, constrName,
tuple, recurse, recursing, lockmode);
}
else if (con->contype == CONSTRAINT_NOTNULL)
{
QueueNNConstraintValidation(wqueue, conrel, rel,
tuple, recurse, recursing, lockmode);
}
ObjectAddressSet(address, ConstraintRelationId, con->oid);
}
@ -13049,6 +13127,109 @@ QueueCheckConstraintValidation(List **wqueue, Relation conrel, Relation rel,
heap_freetuple(copyTuple);
}
/*
* QueueNNConstraintValidation
*
* Add an entry to the wqueue to validate the given not-null constraint in
* Phase 3 and update the convalidated field in the pg_constraint catalog for
* the specified relation and all its inheriting children.
*/
static void
QueueNNConstraintValidation(List **wqueue, Relation conrel, Relation rel,
HeapTuple contuple, bool recurse, bool recursing,
LOCKMODE lockmode)
{
Form_pg_constraint con;
AlteredTableInfo *tab;
HeapTuple copyTuple;
Form_pg_constraint copy_con;
List *children = NIL;
AttrNumber attnum;
char *colname;
con = (Form_pg_constraint) GETSTRUCT(contuple);
Assert(con->contype == CONSTRAINT_NOTNULL);
attnum = extractNotNullColumn(contuple);
/*
* If we're recursing, we've already done this for parent, so skip it.
* Also, if the constraint is a NO INHERIT constraint, we shouldn't try to
* look for it in the children.
*
* We recurse before validating on the parent, to reduce risk of
* deadlocks.
*/
if (!recursing && !con->connoinherit)
children = find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
colname = get_attname(RelationGetRelid(rel), attnum, false);
foreach_oid(childoid, children)
{
Relation childrel;
HeapTuple contup;
Form_pg_constraint childcon;
char *conname;
if (childoid == RelationGetRelid(rel))
continue;
/*
* If we are told not to recurse, there had better not be any child
* tables, because we can't mark the constraint on the parent valid
* unless it is valid for all child tables.
*/
if (!recurse)
ereport(ERROR,
errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("constraint must be validated on child tables too"));
/*
* The column on child might have a different attnum, so search by
* column name.
*/
contup = findNotNullConstraint(childoid, colname);
if (!contup)
elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation \"%s\"",
colname, get_rel_name(childoid));
childcon = (Form_pg_constraint) GETSTRUCT(contup);
if (childcon->convalidated)
continue;
/* find_all_inheritors already got lock */
childrel = table_open(childoid, NoLock);
conname = pstrdup(NameStr(childcon->conname));
/* XXX improve ATExecValidateConstraint API to avoid double search */
ATExecValidateConstraint(wqueue, childrel, conname,
false, true, lockmode);
table_close(childrel, NoLock);
}
/* Set attnotnull appropriately without queueing another validation */
set_attnotnull(NULL, rel, attnum, true, false);
tab = ATGetQueueEntry(wqueue, rel);
tab->verify_new_notnull = true;
/*
* Invalidate relcache so that others see the new validated constraint.
*/
CacheInvalidateRelcache(rel);
/*
* Now update the catalogs, while we have the door open.
*/
copyTuple = heap_copytuple(contuple);
copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
copy_con->convalidated = true;
CatalogTupleUpdate(conrel, &copyTuple->t_self, copyTuple);
InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
heap_freetuple(copyTuple);
}
/*
* transformColumnNameList - transform list of column names
*
@ -19770,17 +19951,19 @@ PartConstraintImpliedByRelConstraint(Relation scanrel,
for (i = 1; i <= natts; i++)
{
Form_pg_attribute att = TupleDescAttr(scanrel->rd_att, i - 1);
CompactAttribute *att = TupleDescCompactAttr(scanrel->rd_att, i - 1);
if (att->attnotnull && !att->attisdropped)
/* invalid not-null constraint must be ignored here */
if (att->attnullability == ATTNULLABLE_VALID && !att->attisdropped)
{
Form_pg_attribute wholeatt = TupleDescAttr(scanrel->rd_att, i - 1);
NullTest *ntest = makeNode(NullTest);
ntest->arg = (Expr *) makeVar(1,
i,
att->atttypid,
att->atttypmod,
att->attcollation,
wholeatt->atttypid,
wholeatt->atttypmod,
wholeatt->attcollation,
0);
ntest->nulltesttype = IS_NOT_NULL;

10
src/backend/jit/llvm/llvmjit_deform.c
View File

@ -123,7 +123,7 @@ slot_compile_deform(LLVMJitContext *context, TupleDesc desc,
* combination of attisdropped && attnotnull combination shouldn't
* exist.
*/
if (att->attnotnull &&
if (att->attnullability == ATTNULLABLE_VALID &&
!att->atthasmissing &&
!att->attisdropped)
guaranteed_column_number = attnum;
@ -438,7 +438,7 @@ slot_compile_deform(LLVMJitContext *context, TupleDesc desc,
* into account, because if they're present the heaptuple's natts
* would have indicated that a slot_getmissingattrs() is needed.
*/
if (!att->attnotnull)
if (att->attnullability != ATTNULLABLE_VALID)
{
LLVMBasicBlockRef b_ifnotnull;
LLVMBasicBlockRef b_ifnull;
@ -604,7 +604,8 @@ slot_compile_deform(LLVMJitContext *context, TupleDesc desc,
known_alignment = -1;
attguaranteedalign = false;
}
else if (att->attnotnull && attguaranteedalign && known_alignment >= 0)
else if (att->attnullability == ATTNULLABLE_VALID &&
attguaranteedalign && known_alignment >= 0)
{
/*
* If the offset to the column was previously known, a NOT NULL &
@ -614,7 +615,8 @@ slot_compile_deform(LLVMJitContext *context, TupleDesc desc,
Assert(att->attlen > 0);
known_alignment += att->attlen;
}
else if (att->attnotnull && (att->attlen % alignto) == 0)
else if (att->attnullability == ATTNULLABLE_VALID &&
(att->attlen % alignto) == 0)
{
/*
* After a NOT NULL fixed-width column with a length that is a

16
src/backend/optimizer/util/plancat.c
View File

@ -177,7 +177,9 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
{
CompactAttribute *attr = TupleDescCompactAttr(relation->rd_att, i);
if (attr->attnotnull)
Assert(attr->attnullability != ATTNULLABLE_UNKNOWN);
if (attr->attnullability == ATTNULLABLE_VALID)
{
rel->notnullattnums = bms_add_member(rel->notnullattnums,
i + 1);
@ -1251,6 +1253,7 @@ get_relation_data_width(Oid relid, int32 *attr_widths)
* get_relation_constraints
*
* Retrieve the applicable constraint expressions of the given relation.
* Only constraints that have been validated are considered.
*
* Returns a List (possibly empty) of constraint expressions. Each one
* has been canonicalized, and its Vars are changed to have the varno
@ -1351,17 +1354,18 @@ get_relation_constraints(PlannerInfo *root,
for (i = 1; i <= natts; i++)
{
Form_pg_attribute att = TupleDescAttr(relation->rd_att, i - 1);
CompactAttribute *att = TupleDescCompactAttr(relation->rd_att, i - 1);
if (att->attnotnull && !att->attisdropped)
if (att->attnullability == ATTNULLABLE_VALID && !att->attisdropped)
{
Form_pg_attribute wholeatt = TupleDescAttr(relation->rd_att, i - 1);
NullTest *ntest = makeNode(NullTest);
ntest->arg = (Expr *) makeVar(varno,
i,
att->atttypid,
att->atttypmod,
att->attcollation,
wholeatt->atttypid,
wholeatt->atttypmod,
wholeatt->attcollation,
0);
ntest->nulltesttype = IS_NOT_NULL;

5
src/backend/parser/gram.y
View File

@ -4217,11 +4217,10 @@ ConstraintElem:
n->contype = CONSTR_NOTNULL;
n->location = @1;
n->keys = list_make1(makeString($3));
/* no NOT VALID support yet */
processCASbits($4, @4, "NOT NULL",
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, &n->skip_validation,
&n->is_no_inherit, yyscanner);
n->initially_valid = true;
n->initially_valid = !n->skip_validation;
$$ = (Node *) n;
}
| UNIQUE opt_unique_null_treatment '(' columnList opt_without_overlaps ')' opt_c_include opt_definition OptConsTableSpace

73
src/backend/utils/cache/relcache.c vendored
View File

@ -307,7 +307,7 @@ static TupleDesc GetPgClassDescriptor(void);
static TupleDesc GetPgIndexDescriptor(void);
static void AttrDefaultFetch(Relation relation, int ndef);
static int AttrDefaultCmp(const void *a, const void *b);
static void CheckConstraintFetch(Relation relation);
static void CheckNNConstraintFetch(Relation relation);
static int CheckConstraintCmp(const void *a, const void *b);
static void InitIndexAmRoutine(Relation relation);
static void IndexSupportInitialize(oidvector *indclass,
@ -684,6 +684,8 @@ RelationBuildTupleDesc(Relation relation)
attrmiss ||
relation->rd_rel->relchecks > 0)
{
bool is_catalog = IsCatalogRelation(relation);
relation->rd_att->constr = constr;
if (ndef > 0) /* DEFAULTs */
@ -693,9 +695,33 @@ RelationBuildTupleDesc(Relation relation)
constr->missing = attrmiss;
if (relation->rd_rel->relchecks > 0) /* CHECKs */
CheckConstraintFetch(relation);
else
/* CHECK and NOT NULLs */
if (relation->rd_rel->relchecks > 0 ||
(!is_catalog && constr->has_not_null))
CheckNNConstraintFetch(relation);
/*
* Any not-null constraint that wasn't marked invalid by
* CheckNNConstraintFetch must necessarily be valid; make it so in the
* CompactAttribute array.
*/
if (!is_catalog)
{
for (int i = 0; i < relation->rd_rel->relnatts; i++)
{
CompactAttribute *attr;
attr = TupleDescCompactAttr(relation->rd_att, i);
if (attr->attnullability == ATTNULLABLE_UNKNOWN)
attr->attnullability = ATTNULLABLE_VALID;
else
Assert(attr->attnullability == ATTNULLABLE_INVALID ||
attr->attnullability == ATTNULLABLE_UNRESTRICTED);
}
}
if (relation->rd_rel->relchecks == 0)
constr->num_check = 0;
}
else
@ -3575,6 +3601,14 @@ RelationBuildLocalRelation(const char *relname,
datt->attnotnull = satt->attnotnull;
has_not_null |= satt->attnotnull;
populate_compact_attribute(rel->rd_att, i);
if (satt->attnotnull)
{
CompactAttribute *scatt = TupleDescCompactAttr(tupDesc, i);
CompactAttribute *dcatt = TupleDescCompactAttr(rel->rd_att, i);
dcatt->attnullability = scatt->attnullability;
}
}
if (has_not_null)
@ -4533,13 +4567,14 @@ AttrDefaultCmp(const void *a, const void *b)
}
/*
* Load any check constraints for the relation.
* Load any check constraints for the relation, and update not-null validity
* of invalid constraints.
*
* As with defaults, if we don't find the expected number of them, just warn
* here. The executor should throw an error if an INSERT/UPDATE is attempted.
*/
static void
CheckConstraintFetch(Relation relation)
CheckNNConstraintFetch(Relation relation)
{
ConstrCheck *check;
int ncheck = relation->rd_rel->relchecks;
@ -4570,7 +4605,31 @@ CheckConstraintFetch(Relation relation)
Datum val;
bool isnull;
/* We want check constraints only */
/*
* If this is a not-null constraint, then only look at it if it's
* invalid, and if so, mark the TupleDesc entry as known invalid.
* Otherwise move on. We'll mark any remaining columns that are still
* in UNKNOWN state as known valid later. This allows us not to have
* to extract the attnum from this constraint tuple in the vast
* majority of cases.
*/
if (conform->contype == CONSTRAINT_NOTNULL)
{
if (!conform->convalidated)
{
AttrNumber attnum;
attnum = extractNotNullColumn(htup);
Assert(relation->rd_att->compact_attrs[attnum - 1].attnullability ==
ATTNULLABLE_UNKNOWN);
relation->rd_att->compact_attrs[attnum - 1].attnullability =
ATTNULLABLE_INVALID;
}
continue;
}
/* For what follows, consider check constraints only */
if (conform->contype != CONSTRAINT_CHECK)
continue;

190
src/bin/pg_dump/pg_dump.c
View File

@ -350,8 +350,10 @@ static void buildMatViewRefreshDependencies(Archive *fout);
static void getTableDataFKConstraints(void);
static void determineNotNullFlags(Archive *fout, PGresult *res, int r,
TableInfo *tbinfo, int j,
int i_notnull_name, int i_notnull_noinherit,
int i_notnull_islocal);
int i_notnull_name, int i_notnull_invalidoid,
int i_notnull_noinherit,
int i_notnull_islocal,
PQExpBuffer *invalidnotnulloids);
static char *format_function_arguments(const FuncInfo *finfo, const char *funcargs,
bool is_agg);
static char *format_function_signature(Archive *fout,
@ -8984,6 +8986,7 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
PQExpBuffer q = createPQExpBuffer();
PQExpBuffer tbloids = createPQExpBuffer();
PQExpBuffer checkoids = createPQExpBuffer();
PQExpBuffer invalidnotnulloids = NULL;
PGresult *res;
int ntups;
int curtblindx;
@ -9003,6 +9006,7 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
int i_notnull_name;
int i_notnull_noinherit;
int i_notnull_islocal;
int i_notnull_invalidoid;
int i_attoptions;
int i_attcollation;
int i_attcompression;
@ -9089,6 +9093,10 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
* attnotnull (this cues dumpTableSchema to print the NOT NULL clause
* without a name); also, such cases are never NO INHERIT.
*
* For invalid constraints, we need to store their OIDs for processing
* elsewhere, so we bring the pg_constraint.oid value when the constraint
* is invalid, and NULL otherwise.
*
* We track in notnull_islocal whether the constraint was defined directly
* in this table or via an ancestor, for binary upgrade. flagInhAttrs
* might modify this later for servers older than 18; it's also in charge
@ -9097,11 +9105,14 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
if (fout->remoteVersion >= 180000)
appendPQExpBufferStr(q,
"co.conname AS notnull_name,\n"
"CASE WHEN NOT co.convalidated THEN co.oid "
"ELSE NULL END AS notnull_invalidoid,\n"
"co.connoinherit AS notnull_noinherit,\n"
"co.conislocal AS notnull_islocal,\n");
else
appendPQExpBufferStr(q,
"CASE WHEN a.attnotnull THEN '' ELSE NULL END AS notnull_name,\n"
"NULL AS notnull_invalidoid,\n"
"false AS notnull_noinherit,\n"
"a.attislocal AS notnull_islocal,\n");
@ -9176,6 +9187,7 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
i_attalign = PQfnumber(res, "attalign");
i_attislocal = PQfnumber(res, "attislocal");
i_notnull_name = PQfnumber(res, "notnull_name");
i_notnull_invalidoid = PQfnumber(res, "notnull_invalidoid");
i_notnull_noinherit = PQfnumber(res, "notnull_noinherit");
i_notnull_islocal = PQfnumber(res, "notnull_islocal");
i_attoptions = PQfnumber(res, "attoptions");
@ -9272,8 +9284,11 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
/* Handle not-null constraint name and flags */
determineNotNullFlags(fout, res, r,
tbinfo, j,
i_notnull_name, i_notnull_noinherit,
i_notnull_islocal);
i_notnull_name,
i_notnull_invalidoid,
i_notnull_noinherit,
i_notnull_islocal,
&invalidnotnulloids);
tbinfo->attoptions[j] = pg_strdup(PQgetvalue(res, r, i_attoptions));
tbinfo->attcollation[j] = atooid(PQgetvalue(res, r, i_attcollation));
@ -9294,6 +9309,10 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
}
}
/* If invalidnotnulloids has any data, finalize it */
if (invalidnotnulloids != NULL)
appendPQExpBufferChar(invalidnotnulloids, '}');
PQclear(res);
/*
@ -9426,6 +9445,103 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
PQclear(res);
}
/*
* Get info about NOT NULL NOT VALID constraints. This is skipped for a
* data-only dump, as it is only needed for table schemas.
*/
if (dopt->dumpSchema && invalidnotnulloids)
{
ConstraintInfo *constrs;
int numConstrs;
int i_tableoid;
int i_oid;
int i_conrelid;
int i_conname;
int i_consrc;
int i_conislocal;
pg_log_info("finding invalid not null constraints");
resetPQExpBuffer(q);
appendPQExpBuffer(q,
"SELECT c.tableoid, c.oid, conrelid, conname, "
"pg_catalog.pg_get_constraintdef(c.oid) AS consrc, "
"conislocal, convalidated "
"FROM unnest('%s'::pg_catalog.oid[]) AS src(conoid)\n"
"JOIN pg_catalog.pg_constraint c ON (src.conoid = c.oid)\n"
"ORDER BY c.conrelid, c.conname",
invalidnotnulloids->data);
res = ExecuteSqlQuery(fout, q->data, PGRES_TUPLES_OK);
numConstrs = PQntuples(res);
constrs = (ConstraintInfo *) pg_malloc(numConstrs * sizeof(ConstraintInfo));
i_tableoid = PQfnumber(res, "tableoid");
i_oid = PQfnumber(res, "oid");
i_conrelid = PQfnumber(res, "conrelid");
i_conname = PQfnumber(res, "conname");
i_consrc = PQfnumber(res, "consrc");
i_conislocal = PQfnumber(res, "conislocal");
/* As above, this loop iterates once per table, not once per row */
curtblindx = -1;
for (int j = 0; j < numConstrs;)
{
Oid conrelid = atooid(PQgetvalue(res, j, i_conrelid));
TableInfo *tbinfo = NULL;
int numcons;
/* Count rows for this table */
for (numcons = 1; numcons < numConstrs - j; numcons++)
if (atooid(PQgetvalue(res, j + numcons, i_conrelid)) != conrelid)
break;
/*
* Locate the associated TableInfo; we rely on tblinfo[] being in
* OID order.
*/
while (++curtblindx < numTables)
{
tbinfo = &tblinfo[curtblindx];
if (tbinfo->dobj.catId.oid == conrelid)
break;
}
if (curtblindx >= numTables)
pg_fatal("unrecognized table OID %u", conrelid);
for (int c = 0; c < numcons; c++, j++)
{
constrs[j].dobj.objType = DO_CONSTRAINT;
constrs[j].dobj.catId.tableoid = atooid(PQgetvalue(res, j, i_tableoid));
constrs[j].dobj.catId.oid = atooid(PQgetvalue(res, j, i_oid));
AssignDumpId(&constrs[j].dobj);
constrs[j].dobj.name = pg_strdup(PQgetvalue(res, j, i_conname));
constrs[j].dobj.namespace = tbinfo->dobj.namespace;
constrs[j].contable = tbinfo;
constrs[j].condomain = NULL;
constrs[j].contype = 'n';
constrs[j].condef = pg_strdup(PQgetvalue(res, j, i_consrc));
constrs[j].confrelid = InvalidOid;
constrs[j].conindex = 0;
constrs[j].condeferrable = false;
constrs[j].condeferred = false;
constrs[j].conislocal = (PQgetvalue(res, j, i_conislocal)[0] == 't');
/*
* All invalid not-null constraints must be dumped separately,
* because CREATE TABLE would not create them as invalid, and
* also because they must be created after potentially
* violating data has been loaded.
*/
constrs[j].separate = true;
constrs[j].dobj.dump = tbinfo->dobj.dump;
}
}
PQclear(res);
}
/*
* Get info about table CHECK constraints. This is skipped for a
* data-only dump, as it is only needed for table schemas.
@ -9570,18 +9686,23 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
*
* Result row 'r' is for tbinfo's attribute 'j'.
*
* There are three possibilities:
* There are four possibilities:
* 1) the column has no not-null constraints. In that case, ->notnull_constrs
* (the constraint name) remains NULL.
* 2) The column has a constraint with no name (this is the case when
* constraints come from pre-18 servers). In this case, ->notnull_constrs
* is set to the empty string; dumpTableSchema will print just "NOT NULL".
* 3) The column has a constraint with a known name; in that case
* 3) The column has an invalid not-null constraint. This must be treated
* as a separate object (because it must be created after the table data
* is loaded). So we add its OID to invalidnotnulloids for processing
* elsewhere and do nothing further with it here. We distinguish this
* case because the "notnull_invalidoid" column has been set to a non-NULL
* value, which is the constraint OID. Valid constraints have a null OID.
* 4) The column has a constraint with a known name; in that case
* notnull_constrs carries that name and dumpTableSchema will print
* "CONSTRAINT the_name NOT NULL". However, if the name is the default
* (table_column_not_null), there's no need to print that name in the dump,
* so notnull_constrs is set to the empty string and it behaves as the case
* above.
* so notnull_constrs is set to the empty string and it behaves as case 2.
*
* In a child table that inherits from a parent already containing NOT NULL
* constraints and the columns in the child don't have their own NOT NULL
@ -9593,19 +9714,53 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
* Any of these constraints might have the NO INHERIT bit. If so we set
* ->notnull_noinh and NO INHERIT will be printed by dumpTableSchema.
*
* In case 3 above, the name comparison is a bit of a hack; it actually fails
* In case 4 above, the name comparison is a bit of a hack; it actually fails
* to do the right thing in all but the trivial case. However, the downside
* of getting it wrong is simply that the name is printed rather than
* suppressed, so it's not a big deal.
*
* invalidnotnulloids is expected to be given as NULL; if any invalid not-null
* constraints are found, it is initialized and filled with the array of
* OIDs of such constraints, for later processing.
*/
static void
determineNotNullFlags(Archive *fout, PGresult *res, int r,
TableInfo *tbinfo, int j,
int i_notnull_name, int i_notnull_noinherit,
int i_notnull_islocal)
int i_notnull_name,
int i_notnull_invalidoid,
int i_notnull_noinherit,
int i_notnull_islocal,
PQExpBuffer *invalidnotnulloids)
{
DumpOptions *dopt = fout->dopt;
/*
* If this not-null constraint is not valid, list its OID in
* invalidnotnulloids and do nothing further. It'll be processed
* elsewhere later.
*
* Because invalid not-null constraints are rare, we don't want to malloc
* invalidnotnulloids until we're sure we're going it need it, which
* happens here.
*/
if (!PQgetisnull(res, r, i_notnull_invalidoid))
{
char *constroid = PQgetvalue(res, r, i_notnull_invalidoid);
if (*invalidnotnulloids == NULL)
{
*invalidnotnulloids = createPQExpBuffer();
appendPQExpBufferChar(*invalidnotnulloids, '{');
appendPQExpBuffer(*invalidnotnulloids, "%s", constroid);
}
else
appendPQExpBuffer(*invalidnotnulloids, ",%s", constroid);
/* nothing else to do */
tbinfo->notnull_constrs[j] = NULL;
return;
}
/*
* notnull_noinh is straight from the query result. notnull_islocal also,
* though flagInhAttrs may change that one later in versions < 18.
@ -18152,13 +18307,20 @@ dumpConstraint(Archive *fout, const ConstraintInfo *coninfo)
.createStmt = q->data,
.dropStmt = delq->data));
}
else if (coninfo->contype == 'c' && tbinfo)
else if ((coninfo->contype == 'c' || coninfo->contype == 'n') && tbinfo)
{
/* CHECK constraint on a table */
/* CHECK or invalid not-null constraint on a table */
/* Ignore if not to be dumped separately, or if it was inherited */
if (coninfo->separate && coninfo->conislocal)
{
const char *keyword;
if (coninfo->contype == 'c')
keyword = "CHECK CONSTRAINT";
else
keyword = "CONSTRAINT";
/* not ONLY since we want it to propagate to children */
appendPQExpBuffer(q, "ALTER %sTABLE %s\n", foreign,
fmtQualifiedDumpable(tbinfo));
@ -18178,7 +18340,7 @@ dumpConstraint(Archive *fout, const ConstraintInfo *coninfo)
ARCHIVE_OPTS(.tag = tag,
.namespace = tbinfo->dobj.namespace->dobj.name,
.owner = tbinfo->rolname,
.description = "CHECK CONSTRAINT",
.description = keyword,
.section = SECTION_POST_DATA,
.createStmt = q->data,
.dropStmt = delq->data));

2
src/bin/pg_dump/pg_dump.h
View File

@ -498,6 +498,8 @@ typedef struct _evttriggerInfo
* use a different objType for foreign key constraints, to make it easier
* to sort them the way we want.
*
* Not-null constraints don't need this, unless they are NOT VALID.
*
* Note: condeferrable and condeferred are currently only valid for
* unique/primary-key constraints. Otherwise that info is in condef.
*/

21
src/bin/pg_dump/t/002_pg_dump.pl
View File

@ -744,8 +744,8 @@ my %pgdump_runs = (
schema_only_with_statistics => {
dump_cmd => [
'pg_dump', '--no-sync',
"--file=$tempdir/schema_only_with_statistics.sql", '--schema-only',
'--with-statistics', 'postgres',
"--file=$tempdir/schema_only_with_statistics.sql",
'--schema-only', '--with-statistics', 'postgres',
],
},
no_schema => {
@ -1118,6 +1118,23 @@ my %tests = (
},
},
'CONSTRAINT NOT NULL / INVALID' => {
create_sql => 'CREATE TABLE dump_test.test_table_nn (
col1 int);
ALTER TABLE dump_test.test_table_nn ADD CONSTRAINT nn NOT NULL col1 NOT VALID;',
regexp => qr/^
\QALTER TABLE dump_test.test_table_nn\E \n^\s+
\QADD CONSTRAINT nn NOT NULL col1 NOT VALID;\E
/xm,
like => {
%full_runs, %dump_test_schema_runs, section_post_data => 1,
},
unlike => {
exclude_dump_test_schema => 1,
only_dump_measurement => 1,
},
},
'CONSTRAINT PRIMARY KEY / WITHOUT OVERLAPS' => {
create_sql => 'CREATE TABLE dump_test.test_table_tpk (
col1 int4range,

9
src/bin/psql/describe.c
View File

@ -3106,7 +3106,8 @@ describeOneTableDetails(const char *schemaname,
{
printfPQExpBuffer(&buf,
"SELECT c.conname, a.attname, c.connoinherit,\n"
" c.conislocal, c.coninhcount <> 0\n"
" c.conislocal, c.coninhcount <> 0,\n"
" c.convalidated\n"
"FROM pg_catalog.pg_constraint c JOIN\n"
" pg_catalog.pg_attribute a ON\n"
" (a.attrelid = c.conrelid AND a.attnum = c.conkey[1])\n"
@ -3129,14 +3130,16 @@ describeOneTableDetails(const char *schemaname,
{
bool islocal = PQgetvalue(result, i, 3)[0] == 't';
bool inherited = PQgetvalue(result, i, 4)[0] == 't';
bool validated = PQgetvalue(result, i, 5)[0] == 't';
printfPQExpBuffer(&buf, " \"%s\" NOT NULL \"%s\"%s",
printfPQExpBuffer(&buf, " \"%s\" NOT NULL \"%s\"%s%s",
PQgetvalue(result, i, 0),
PQgetvalue(result, i, 1),
PQgetvalue(result, i, 2)[0] == 't' ?
" NO INHERIT" :
islocal && inherited ? _(" (local, inherited)") :
inherited ? _(" (inherited)") : "");
inherited ? _(" (inherited)") : "",
!validated ? " NOT VALID" : "");
printTableAddFooter(&cont, buf.data);
}

10
src/include/access/tupdesc.h
View File

@ -42,7 +42,7 @@ typedef struct TupleConstr
struct AttrMissing *missing; /* missing attributes values, NULL if none */
uint16 num_defval;
uint16 num_check;
bool has_not_null;
bool has_not_null; /* any not-null, including not valid ones */
bool has_generated_stored;
bool has_generated_virtual;
} TupleConstr;
@ -76,10 +76,16 @@ typedef struct CompactAttribute
bool atthasmissing; /* as FormData_pg_attribute.atthasmissing */
bool attisdropped; /* as FormData_pg_attribute.attisdropped */
bool attgenerated; /* FormData_pg_attribute.attgenerated != '\0' */
bool attnotnull; /* as FormData_pg_attribute.attnotnull */
char attnullability; /* status of not-null constraint, see below */
uint8 attalignby; /* alignment requirement in bytes */
} CompactAttribute;
/* Valid values for CompactAttribute->attnullability */
#define ATTNULLABLE_UNRESTRICTED 'f' /* No constraint exists */
#define ATTNULLABLE_UNKNOWN 'u' /* constraint exists, validity unknown */
#define ATTNULLABLE_VALID 'v' /* valid constraint exists */
#define ATTNULLABLE_INVALID 'i' /* constraint exists, marked invalid */
/*
* This struct is passed around within the backend to describe the structure
* of tuples. For tuples coming from on-disk relations, the information is

4
src/include/catalog/pg_attribute.h
View File

@ -117,7 +117,9 @@ CATALOG(pg_attribute,1249,AttributeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(75,
*/
char attcompression BKI_DEFAULT('\0');
/* This flag represents the "NOT NULL" constraint */
/*
* Whether a (possibly invalid) not-null constraint exists for the column
*/
bool attnotnull;
/* Has DEFAULT value or not */

2
src/include/catalog/pg_constraint.h
View File

@ -264,7 +264,7 @@ extern HeapTuple findNotNullConstraint(Oid relid, const char *colname);
extern HeapTuple findDomainNotNullConstraint(Oid typid);
extern AttrNumber extractNotNullColumn(HeapTuple constrTup);
extern bool AdjustNotNullInheritance(Oid relid, AttrNumber attnum,
bool is_local, bool is_no_inherit);
bool is_local, bool is_no_inherit, bool is_notvalid);
extern List *RelationGetNotNullConstraints(Oid relid, bool cooked,
bool include_noinh);

69
src/test/regress/expected/alter_table.out
View File

@ -1202,6 +1202,75 @@ alter table atacc1 alter test_a drop not null, alter test_b drop not null;
alter table atacc1 add constraint atacc1_constr_b_valid check(test_b is not null);
alter table atacc1 alter test_b set not null, alter test_a set not null;
drop table atacc1;
-- not null not valid with partitions
CREATE TABLE atnnparted (id int, col1 int) PARTITION BY LIST (id);
ALTER TABLE atnnparted ADD CONSTRAINT dummy_constr NOT NULL id NOT VALID;
CREATE TABLE atnnpart1 (col1 int, id int);
ALTER TABLE atnnpart1 ADD CONSTRAINT another_constr NOT NULL id;
ALTER TABLE atnnpart1 ADD PRIMARY KEY (id);
ALTER TABLE atnnparted ATTACH PARTITION atnnpart1 FOR VALUES IN ('1');
\d+ atnnpart*
Table "public.atnnpart1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+---------+-----------+----------+---------+---------+--------------+-------------
col1 | integer | | | | plain | |
id | integer | | not null | | plain | |
Partition of: atnnparted FOR VALUES IN (1)
Partition constraint: ((id IS NOT NULL) AND (id = 1))
Indexes:
"atnnpart1_pkey" PRIMARY KEY, btree (id)
Not-null constraints:
"another_constr" NOT NULL "id" (inherited)
Index "public.atnnpart1_pkey"
Column | Type | Key? | Definition | Storage | Stats target
--------+---------+------+------------+---------+--------------
id | integer | yes | id | plain |
primary key, btree, for table "public.atnnpart1"
Partitioned table "public.atnnparted"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+---------+-----------+----------+---------+---------+--------------+-------------
id | integer | | not null | | plain | |
col1 | integer | | | | plain | |
Partition key: LIST (id)
Not-null constraints:
"dummy_constr" NOT NULL "id" NOT VALID
Partitions: atnnpart1 FOR VALUES IN (1)
BEGIN;
ALTER TABLE atnnparted VALIDATE CONSTRAINT dummy_constr;
\d+ atnnpart*
Table "public.atnnpart1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+---------+-----------+----------+---------+---------+--------------+-------------
col1 | integer | | | | plain | |
id | integer | | not null | | plain | |
Partition of: atnnparted FOR VALUES IN (1)
Partition constraint: ((id IS NOT NULL) AND (id = 1))
Indexes:
"atnnpart1_pkey" PRIMARY KEY, btree (id)
Not-null constraints:
"another_constr" NOT NULL "id" (inherited)
Index "public.atnnpart1_pkey"
Column | Type | Key? | Definition | Storage | Stats target
--------+---------+------+------------+---------+--------------
id | integer | yes | id | plain |
primary key, btree, for table "public.atnnpart1"
Partitioned table "public.atnnparted"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+---------+-----------+----------+---------+---------+--------------+-------------
id | integer | | not null | | plain | |
col1 | integer | | | | plain | |
Partition key: LIST (id)
Not-null constraints:
"dummy_constr" NOT NULL "id"
Partitions: atnnpart1 FOR VALUES IN (1)
ROLLBACK;
-- leave a table in this state for the pg_upgrade test
-- test inheritance
create table parent (a int);
create table child (b varchar(255)) inherits (parent);

252
src/test/regress/expected/constraints.out
View File

@ -1229,6 +1229,13 @@ alter table cnn_uq add unique using index cnn_uq_idx;
Indexes:
"cnn_uq_idx" UNIQUE CONSTRAINT, btree (a)
-- can't create a primary key on a noinherit not-null
create table cnn_pk (a int not null no inherit);
alter table cnn_pk add primary key (a);
ERROR: cannot create primary key on column "a"
DETAIL: The constraint "cnn_pk_a_not_null" on column "a", marked NO INHERIT, is incompatible with a primary key.
HINT: You will need to make it inheritable using ALTER TABLE ... ALTER CONSTRAINT ... INHERIT.
drop table cnn_pk;
-- Ensure partitions are scanned for null values when adding a PK
create table cnn2_parted(a int) partition by list (a);
create table cnn_part1 partition of cnn2_parted for values in (1, null);
@ -1355,6 +1362,251 @@ Not-null constraints:
"ann" NOT NULL "a"
"bnn" NOT NULL "b"
-- NOT NULL NOT VALID
PREPARE get_nnconstraint_info(regclass[]) AS
SELECT conrelid::regclass as tabname, conname, convalidated, conislocal, coninhcount
FROM pg_constraint
WHERE conrelid = ANY($1)
ORDER BY conrelid::regclass::text, conname;
CREATE TABLE notnull_tbl1 (a int, b int);
INSERT INTO notnull_tbl1 VALUES (NULL, 1), (300, 3);
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nn NOT NULL a; -- error
ERROR: column "a" of relation "notnull_tbl1" contains null values
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nn NOT NULL a NOT VALID; -- ok
-- even an invalid not-null forbids new nulls
INSERT INTO notnull_tbl1 VALUES (NULL, 4);
ERROR: null value in column "a" of relation "notnull_tbl1" violates not-null constraint
DETAIL: Failing row contains (null, 4).
\d+ notnull_tbl1
Table "public.notnull_tbl1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+---------+-----------+----------+---------+---------+--------------+-------------
a | integer | | not null | | plain | |
b | integer | | | | plain | |
Not-null constraints:
"nn" NOT NULL "a" NOT VALID
-- If we have an invalid constraint, we can't have another
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nn1 NOT NULL a NOT VALID NO INHERIT;
ERROR: cannot change NO INHERIT status of NOT NULL constraint "nn" on relation "notnull_tbl1"
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nn NOT NULL a;
ERROR: incompatible NOT VALID constraint "nn" on relation "notnull_tbl1"
HINT: You will need to use ALTER TABLE ... VALIDATE CONSTRAINT to validate it.
-- cannot add primary key on a column with an invalid not-null
ALTER TABLE notnull_tbl1 ADD PRIMARY KEY (a);
ERROR: cannot create primary key on column "a"
DETAIL: The constraint "nn" on column "a", marked NOT VALID, is incompatible with a primary key.
HINT: You will need to validate it using ALTER TABLE ... VALIDATE CONSTRAINT.
-- ALTER column SET NOT NULL validates an invalid constraint (but this fails
-- because of rows with null values)
ALTER TABLE notnull_tbl1 ALTER a SET NOT NULL;
ERROR: column "a" of relation "notnull_tbl1" contains null values
\d+ notnull_tbl1
Table "public.notnull_tbl1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+---------+-----------+----------+---------+---------+--------------+-------------
a | integer | | not null | | plain | |
b | integer | | | | plain | |
Not-null constraints:
"nn" NOT NULL "a" NOT VALID
-- Creating a derived table using LIKE gets the constraint, but it's valid
CREATE TABLE notnull_tbl1_copy (LIKE notnull_tbl1);
EXECUTE get_nnconstraint_info('{notnull_tbl1_copy}');
tabname | conname | convalidated | conislocal | coninhcount
-------------------+---------+--------------+------------+-------------
notnull_tbl1_copy | nn | t | t | 0
(1 row)
-- An inheritance child table gets the constraint, but it's valid
CREATE TABLE notnull_tbl1_child (a int, b int) INHERITS (notnull_tbl1);
NOTICE: merging column "a" with inherited definition
NOTICE: merging column "b" with inherited definition
EXECUTE get_nnconstraint_info('{notnull_tbl1_child, notnull_tbl1}');
tabname | conname | convalidated | conislocal | coninhcount
--------------------+---------+--------------+------------+-------------
notnull_tbl1 | nn | f | t | 0
notnull_tbl1_child | nn | t | f | 1
(2 rows)
-- Also try inheritance added after table creation
CREATE TABLE notnull_tbl1_child2 (c int, b int, a int);
ALTER TABLE notnull_tbl1_child2 INHERIT notnull_tbl1; -- nope
ERROR: column "a" in child table "notnull_tbl1_child2" must be marked NOT NULL
ALTER TABLE notnull_tbl1_child2 ADD NOT NULL a NOT VALID;
ALTER TABLE notnull_tbl1_child2 INHERIT notnull_tbl1;
EXECUTE get_nnconstraint_info('{notnull_tbl1_child2}');
tabname | conname | convalidated | conislocal | coninhcount
---------------------+--------------------------------+--------------+------------+-------------
notnull_tbl1_child2 | notnull_tbl1_child2_a_not_null | f | t | 1
(1 row)
--table rewrite won't validate invalid constraint
ALTER TABLE notnull_tbl1 ADD column d float8 default random();
-- VALIDATE CONSTRAINT scans the table
ALTER TABLE notnull_tbl1 VALIDATE CONSTRAINT nn; -- error, nulls exist
ERROR: column "a" of relation "notnull_tbl1" contains null values
UPDATE notnull_tbl1 SET a = 100 WHERE b = 1;
ALTER TABLE notnull_tbl1 VALIDATE CONSTRAINT nn; -- now ok
EXECUTE get_nnconstraint_info('{notnull_tbl1}');
tabname | conname | convalidated | conislocal | coninhcount
--------------+---------+--------------+------------+-------------
notnull_tbl1 | nn | t | t | 0
(1 row)
--- now we can add primary key
ALTER TABLE notnull_tbl1 ADD PRIMARY KEY (a);
DROP TABLE notnull_tbl1, notnull_tbl1_child, notnull_tbl1_child2;
-- dropping an invalid constraint is possible
CREATE TABLE notnull_tbl1 (a int, b int);
ALTER TABLE notnull_tbl1 ADD NOT NULL a NOT VALID,
ADD NOT NULL b NOT VALID;
ALTER TABLE notnull_tbl1 ALTER a DROP NOT NULL;
ALTER TABLE notnull_tbl1 DROP CONSTRAINT notnull_tbl1_b_not_null;
DROP TABLE notnull_tbl1;
-- ALTER .. NO INHERIT works for invalid constraints
CREATE TABLE notnull_tbl1 (a int);
CREATE TABLE notnull_tbl1_chld () INHERITS (notnull_tbl1);
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nntbl1_a NOT NULL a NOT VALID;
ALTER TABLE notnull_tbl1 ALTER CONSTRAINT nntbl1_a NO INHERIT;
-- DROP CONSTRAINT recurses correctly on invalid constraints
ALTER TABLE notnull_tbl1 ALTER CONSTRAINT nntbl1_a INHERIT;
ALTER TABLE notnull_tbl1 DROP CONSTRAINT nntbl1_a;
DROP TABLE notnull_tbl1, notnull_tbl1_chld;
-- if a parent has a valid not null constraint then a child table cannot
-- have an invalid one
CREATE TABLE notnull_tbl1 (a int);
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nn_parent NOT NULL a not valid;
CREATE TABLE notnull_chld0 (a int, CONSTRAINT nn_chld0 NOT NULL a);
ALTER TABLE notnull_tbl1 INHERIT notnull_chld0; --error
ERROR: constraint "nn_parent" conflicts with NOT VALID constraint on child table "notnull_tbl1"
ALTER TABLE notnull_chld0 DROP CONSTRAINT nn_chld0;
ALTER TABLE notnull_chld0 ADD CONSTRAINT nn_chld0 NOT NULL a not valid;
ALTER TABLE notnull_tbl1 INHERIT notnull_chld0; --now ok
-- parents and child not-null will all be validated.
ALTER TABLE notnull_tbl1 VALIDATE CONSTRAINT nn_parent;
EXECUTE get_nnconstraint_info('{notnull_tbl1, notnull_chld0}');
tabname | conname | convalidated | conislocal | coninhcount
---------------+-----------+--------------+------------+-------------
notnull_chld0 | nn_chld0 | f | t | 0
notnull_tbl1 | nn_parent | t | t | 1
(2 rows)
DROP TABLE notnull_tbl1, notnull_chld0;
-- Test invalid not null on inheritance table.
CREATE TABLE notnull_inhparent (i int);
CREATE TABLE notnull_inhchild (i int) INHERITS (notnull_inhparent);
NOTICE: merging column "i" with inherited definition
CREATE TABLE notnull_inhgrand () INHERITS (notnull_inhparent, notnull_inhchild);
NOTICE: merging multiple inherited definitions of column "i"
ALTER TABLE notnull_inhparent ADD CONSTRAINT nn NOT NULL i NOT VALID;
ALTER TABLE notnull_inhchild ADD CONSTRAINT nn1 NOT NULL i; -- error
ERROR: incompatible NOT VALID constraint "nn" on relation "notnull_inhchild"
HINT: You will need to use ALTER TABLE ... VALIDATE CONSTRAINT to validate it.
EXECUTE get_nnconstraint_info('{notnull_inhparent, notnull_inhchild, notnull_inhgrand}');
tabname | conname | convalidated | conislocal | coninhcount
-------------------+---------+--------------+------------+-------------
notnull_inhchild | nn | f | f | 1
notnull_inhgrand | nn | f | f | 2
notnull_inhparent | nn | f | t | 0
(3 rows)
ALTER TABLE notnull_inhparent ALTER i SET NOT NULL; -- ok
EXECUTE get_nnconstraint_info('{notnull_inhparent, notnull_inhchild, notnull_inhgrand}');
tabname | conname | convalidated | conislocal | coninhcount
-------------------+---------+--------------+------------+-------------
notnull_inhchild | nn | t | f | 1
notnull_inhgrand | nn | t | f | 2
notnull_inhparent | nn | t | t | 0
(3 rows)
DROP TABLE notnull_inhparent, notnull_inhchild, notnull_inhgrand;
-- Verify NOT NULL VALID/NOT VALID with partition table.
DROP TABLE notnull_tbl1;
ERROR: table "notnull_tbl1" does not exist
CREATE TABLE notnull_tbl1 (a int, b int) PARTITION BY LIST (a);
ALTER TABLE notnull_tbl1 ADD CONSTRAINT notnull_con NOT NULL a NOT VALID; --ok
CREATE TABLE notnull_tbl1_1 PARTITION OF notnull_tbl1 FOR VALUES IN (1,2);
CREATE TABLE notnull_tbl1_2(a int, CONSTRAINT nn2 NOT NULL a, b int);
ALTER TABLE notnull_tbl1 ATTACH PARTITION notnull_tbl1_2 FOR VALUES IN (3,4);
CREATE TABLE notnull_tbl1_3(a int, b int);
INSERT INTO notnull_tbl1_3 values(NULL,1);
ALTER TABLE notnull_tbl1_3 add CONSTRAINT nn3 NOT NULL a NOT VALID;
ALTER TABLE notnull_tbl1 ATTACH PARTITION notnull_tbl1_3 FOR VALUES IN (NULL,5);
EXECUTE get_nnconstraint_info('{notnull_tbl1, notnull_tbl1_1, notnull_tbl1_2, notnull_tbl1_3}');
tabname | conname | convalidated | conislocal | coninhcount
----------------+-------------+--------------+------------+-------------
notnull_tbl1 | notnull_con | f | t | 0
notnull_tbl1_1 | notnull_con | t | f | 1
notnull_tbl1_2 | nn2 | t | f | 1
notnull_tbl1_3 | nn3 | f | f | 1
(4 rows)
ALTER TABLE notnull_tbl1 ALTER COLUMN a SET NOT NULL; --error, notnull_tbl1_3 have null values
ERROR: column "a" of relation "notnull_tbl1_3" contains null values
ALTER TABLE notnull_tbl1_3 VALIDATE CONSTRAINT nn3; --error
ERROR: column "a" of relation "notnull_tbl1_3" contains null values
TRUNCATE notnull_tbl1;
ALTER TABLE notnull_tbl1 ALTER COLUMN a SET NOT NULL; --OK
EXECUTE get_nnconstraint_info('{notnull_tbl1, notnull_tbl1_1, notnull_tbl1_2, notnull_tbl1_3}');
tabname | conname | convalidated | conislocal | coninhcount
----------------+-------------+--------------+------------+-------------
notnull_tbl1 | notnull_con | t | t | 0
notnull_tbl1_1 | notnull_con | t | f | 1
notnull_tbl1_2 | nn2 | t | f | 1
notnull_tbl1_3 | nn3 | t | f | 1
(4 rows)
DROP TABLE notnull_tbl1;
-- partitioned table have not-null, then the partitions can not be NOT NULL NOT VALID.
CREATE TABLE pp_nn (a int, b int, NOT NULL a) PARTITION BY LIST (a);
CREATE TABLE pp_nn_1(a int, b int);
ALTER TABLE pp_nn_1 ADD CONSTRAINT nn1 NOT NULL a NOT VALID;
ALTER TABLE pp_nn ATTACH PARTITION pp_nn_1 FOR VALUES IN (NULL,5); --error
ERROR: constraint "nn1" conflicts with NOT VALID constraint on child table "pp_nn_1"
ALTER TABLE pp_nn_1 VALIDATE CONSTRAINT nn1;
ALTER TABLE pp_nn ATTACH PARTITION pp_nn_1 FOR VALUES IN (NULL,5); --ok
DROP TABLE pp_nn;
-- Create table with NOT NULL INVALID constraint, for pg_upgrade.
CREATE TABLE notnull_tbl1_upg (a int, b int);
INSERT INTO notnull_tbl1_upg VALUES (NULL, 1), (NULL, 2), (300, 3);
ALTER TABLE notnull_tbl1_upg ADD CONSTRAINT nn NOT NULL a NOT VALID;
-- Inherit test for pg_upgrade
CREATE TABLE notnull_parent_upg (a int);
CREATE TABLE notnull_child_upg () INHERITS (notnull_parent_upg);
ALTER TABLE notnull_child_upg ADD CONSTRAINT nn NOT NULL a;
ALTER TABLE notnull_parent_upg ADD CONSTRAINT nn NOT NULL a NOT VALID;
SELECT conrelid::regclass, contype, convalidated, conislocal
FROM pg_catalog.pg_constraint
WHERE conrelid in ('notnull_parent_upg'::regclass, 'notnull_child_upg'::regclass)
ORDER BY 1;
conrelid | contype | convalidated | conislocal
--------------------+---------+--------------+------------
notnull_parent_upg | n | f | t
notnull_child_upg | n | t | t
(2 rows)
-- Partition table test, for pg_upgrade
CREATE TABLE notnull_part1_upg (a int, b int) PARTITION BY LIST (a);
ALTER TABLE notnull_part1_upg ADD CONSTRAINT notnull_con NOT NULL a NOT VALID; --ok
CREATE TABLE notnull_part1_1_upg PARTITION OF notnull_part1_upg FOR VALUES IN (1,2);
CREATE TABLE notnull_part1_2_upg (a int, CONSTRAINT nn2 NOT NULL a, b int);
ALTER TABLE notnull_part1_upg ATTACH PARTITION notnull_part1_2_upg FOR VALUES IN (3,4);
CREATE TABLE notnull_part1_3_upg (a int, b int);
INSERT INTO notnull_part1_3_upg values(NULL,1);
ALTER TABLE notnull_part1_3_upg add CONSTRAINT nn3 NOT NULL a NOT VALID;
ALTER TABLE notnull_part1_upg ATTACH PARTITION notnull_part1_3_upg FOR VALUES IN (NULL,5);
EXECUTE get_nnconstraint_info('{notnull_part1_upg, notnull_part1_1_upg, notnull_part1_2_upg, notnull_part1_3_upg}');
tabname | conname | convalidated | conislocal | coninhcount
---------------------+-------------+--------------+------------+-------------
notnull_part1_1_upg | notnull_con | t | f | 1
notnull_part1_2_upg | nn2 | t | f | 1
notnull_part1_3_upg | nn3 | f | f | 1
notnull_part1_upg | notnull_con | f | t | 0
(4 rows)
DEALLOCATE get_nnconstraint_info;
-- end NOT NULL NOT VALID
-- Comments
-- Setup a low-level role to enforce non-superuser checks.
CREATE ROLE regress_constraint_comments;

14
src/test/regress/sql/alter_table.sql
View File

@ -910,6 +910,20 @@ alter table atacc1 add constraint atacc1_constr_b_valid check(test_b is not null
alter table atacc1 alter test_b set not null, alter test_a set not null;
drop table atacc1;
-- not null not valid with partitions
CREATE TABLE atnnparted (id int, col1 int) PARTITION BY LIST (id);
ALTER TABLE atnnparted ADD CONSTRAINT dummy_constr NOT NULL id NOT VALID;
CREATE TABLE atnnpart1 (col1 int, id int);
ALTER TABLE atnnpart1 ADD CONSTRAINT another_constr NOT NULL id;
ALTER TABLE atnnpart1 ADD PRIMARY KEY (id);
ALTER TABLE atnnparted ATTACH PARTITION atnnpart1 FOR VALUES IN ('1');
\d+ atnnpart*
BEGIN;
ALTER TABLE atnnparted VALIDATE CONSTRAINT dummy_constr;
\d+ atnnpart*
ROLLBACK;
-- leave a table in this state for the pg_upgrade test
-- test inheritance
create table parent (a int);
create table child (b varchar(255)) inherits (parent);

169
src/test/regress/sql/constraints.sql
View File

@ -761,6 +761,11 @@ create unique index cnn_uq_idx on cnn_uq (a);
alter table cnn_uq add unique using index cnn_uq_idx;
\d+ cnn_uq
-- can't create a primary key on a noinherit not-null
create table cnn_pk (a int not null no inherit);
alter table cnn_pk add primary key (a);
drop table cnn_pk;
-- Ensure partitions are scanned for null values when adding a PK
create table cnn2_parted(a int) partition by list (a);
create table cnn_part1 partition of cnn2_parted for values in (1, null);
@ -801,6 +806,170 @@ ALTER TABLE ONLY notnull_tbl6 DROP CONSTRAINT ann;
ALTER TABLE ONLY notnull_tbl6 ALTER b DROP NOT NULL;
\d+ notnull_tbl6_1
-- NOT NULL NOT VALID
PREPARE get_nnconstraint_info(regclass[]) AS
SELECT conrelid::regclass as tabname, conname, convalidated, conislocal, coninhcount
FROM pg_constraint
WHERE conrelid = ANY($1)
ORDER BY conrelid::regclass::text, conname;
CREATE TABLE notnull_tbl1 (a int, b int);
INSERT INTO notnull_tbl1 VALUES (NULL, 1), (300, 3);
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nn NOT NULL a; -- error
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nn NOT NULL a NOT VALID; -- ok
-- even an invalid not-null forbids new nulls
INSERT INTO notnull_tbl1 VALUES (NULL, 4);
\d+ notnull_tbl1
-- If we have an invalid constraint, we can't have another
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nn1 NOT NULL a NOT VALID NO INHERIT;
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nn NOT NULL a;
-- cannot add primary key on a column with an invalid not-null
ALTER TABLE notnull_tbl1 ADD PRIMARY KEY (a);
-- ALTER column SET NOT NULL validates an invalid constraint (but this fails
-- because of rows with null values)
ALTER TABLE notnull_tbl1 ALTER a SET NOT NULL;
\d+ notnull_tbl1
-- Creating a derived table using LIKE gets the constraint, but it's valid
CREATE TABLE notnull_tbl1_copy (LIKE notnull_tbl1);
EXECUTE get_nnconstraint_info('{notnull_tbl1_copy}');
-- An inheritance child table gets the constraint, but it's valid
CREATE TABLE notnull_tbl1_child (a int, b int) INHERITS (notnull_tbl1);
EXECUTE get_nnconstraint_info('{notnull_tbl1_child, notnull_tbl1}');
-- Also try inheritance added after table creation
CREATE TABLE notnull_tbl1_child2 (c int, b int, a int);
ALTER TABLE notnull_tbl1_child2 INHERIT notnull_tbl1; -- nope
ALTER TABLE notnull_tbl1_child2 ADD NOT NULL a NOT VALID;
ALTER TABLE notnull_tbl1_child2 INHERIT notnull_tbl1;
EXECUTE get_nnconstraint_info('{notnull_tbl1_child2}');
--table rewrite won't validate invalid constraint
ALTER TABLE notnull_tbl1 ADD column d float8 default random();
-- VALIDATE CONSTRAINT scans the table
ALTER TABLE notnull_tbl1 VALIDATE CONSTRAINT nn; -- error, nulls exist
UPDATE notnull_tbl1 SET a = 100 WHERE b = 1;
ALTER TABLE notnull_tbl1 VALIDATE CONSTRAINT nn; -- now ok
EXECUTE get_nnconstraint_info('{notnull_tbl1}');
--- now we can add primary key
ALTER TABLE notnull_tbl1 ADD PRIMARY KEY (a);
DROP TABLE notnull_tbl1, notnull_tbl1_child, notnull_tbl1_child2;
-- dropping an invalid constraint is possible
CREATE TABLE notnull_tbl1 (a int, b int);
ALTER TABLE notnull_tbl1 ADD NOT NULL a NOT VALID,
ADD NOT NULL b NOT VALID;
ALTER TABLE notnull_tbl1 ALTER a DROP NOT NULL;
ALTER TABLE notnull_tbl1 DROP CONSTRAINT notnull_tbl1_b_not_null;
DROP TABLE notnull_tbl1;
-- ALTER .. NO INHERIT works for invalid constraints
CREATE TABLE notnull_tbl1 (a int);
CREATE TABLE notnull_tbl1_chld () INHERITS (notnull_tbl1);
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nntbl1_a NOT NULL a NOT VALID;
ALTER TABLE notnull_tbl1 ALTER CONSTRAINT nntbl1_a NO INHERIT;
-- DROP CONSTRAINT recurses correctly on invalid constraints
ALTER TABLE notnull_tbl1 ALTER CONSTRAINT nntbl1_a INHERIT;
ALTER TABLE notnull_tbl1 DROP CONSTRAINT nntbl1_a;
DROP TABLE notnull_tbl1, notnull_tbl1_chld;
-- if a parent has a valid not null constraint then a child table cannot
-- have an invalid one
CREATE TABLE notnull_tbl1 (a int);
ALTER TABLE notnull_tbl1 ADD CONSTRAINT nn_parent NOT NULL a not valid;
CREATE TABLE notnull_chld0 (a int, CONSTRAINT nn_chld0 NOT NULL a);
ALTER TABLE notnull_tbl1 INHERIT notnull_chld0; --error
ALTER TABLE notnull_chld0 DROP CONSTRAINT nn_chld0;
ALTER TABLE notnull_chld0 ADD CONSTRAINT nn_chld0 NOT NULL a not valid;
ALTER TABLE notnull_tbl1 INHERIT notnull_chld0; --now ok
-- parents and child not-null will all be validated.
ALTER TABLE notnull_tbl1 VALIDATE CONSTRAINT nn_parent;
EXECUTE get_nnconstraint_info('{notnull_tbl1, notnull_chld0}');
DROP TABLE notnull_tbl1, notnull_chld0;
-- Test invalid not null on inheritance table.
CREATE TABLE notnull_inhparent (i int);
CREATE TABLE notnull_inhchild (i int) INHERITS (notnull_inhparent);
CREATE TABLE notnull_inhgrand () INHERITS (notnull_inhparent, notnull_inhchild);
ALTER TABLE notnull_inhparent ADD CONSTRAINT nn NOT NULL i NOT VALID;
ALTER TABLE notnull_inhchild ADD CONSTRAINT nn1 NOT NULL i; -- error
EXECUTE get_nnconstraint_info('{notnull_inhparent, notnull_inhchild, notnull_inhgrand}');
ALTER TABLE notnull_inhparent ALTER i SET NOT NULL; -- ok
EXECUTE get_nnconstraint_info('{notnull_inhparent, notnull_inhchild, notnull_inhgrand}');
DROP TABLE notnull_inhparent, notnull_inhchild, notnull_inhgrand;
-- Verify NOT NULL VALID/NOT VALID with partition table.
DROP TABLE notnull_tbl1;
CREATE TABLE notnull_tbl1 (a int, b int) PARTITION BY LIST (a);
ALTER TABLE notnull_tbl1 ADD CONSTRAINT notnull_con NOT NULL a NOT VALID; --ok
CREATE TABLE notnull_tbl1_1 PARTITION OF notnull_tbl1 FOR VALUES IN (1,2);
CREATE TABLE notnull_tbl1_2(a int, CONSTRAINT nn2 NOT NULL a, b int);
ALTER TABLE notnull_tbl1 ATTACH PARTITION notnull_tbl1_2 FOR VALUES IN (3,4);
CREATE TABLE notnull_tbl1_3(a int, b int);
INSERT INTO notnull_tbl1_3 values(NULL,1);
ALTER TABLE notnull_tbl1_3 add CONSTRAINT nn3 NOT NULL a NOT VALID;
ALTER TABLE notnull_tbl1 ATTACH PARTITION notnull_tbl1_3 FOR VALUES IN (NULL,5);
EXECUTE get_nnconstraint_info('{notnull_tbl1, notnull_tbl1_1, notnull_tbl1_2, notnull_tbl1_3}');
ALTER TABLE notnull_tbl1 ALTER COLUMN a SET NOT NULL; --error, notnull_tbl1_3 have null values
ALTER TABLE notnull_tbl1_3 VALIDATE CONSTRAINT nn3; --error
TRUNCATE notnull_tbl1;
ALTER TABLE notnull_tbl1 ALTER COLUMN a SET NOT NULL; --OK
EXECUTE get_nnconstraint_info('{notnull_tbl1, notnull_tbl1_1, notnull_tbl1_2, notnull_tbl1_3}');
DROP TABLE notnull_tbl1;
-- partitioned table have not-null, then the partitions can not be NOT NULL NOT VALID.
CREATE TABLE pp_nn (a int, b int, NOT NULL a) PARTITION BY LIST (a);
CREATE TABLE pp_nn_1(a int, b int);
ALTER TABLE pp_nn_1 ADD CONSTRAINT nn1 NOT NULL a NOT VALID;
ALTER TABLE pp_nn ATTACH PARTITION pp_nn_1 FOR VALUES IN (NULL,5); --error
ALTER TABLE pp_nn_1 VALIDATE CONSTRAINT nn1;
ALTER TABLE pp_nn ATTACH PARTITION pp_nn_1 FOR VALUES IN (NULL,5); --ok
DROP TABLE pp_nn;
-- Create table with NOT NULL INVALID constraint, for pg_upgrade.
CREATE TABLE notnull_tbl1_upg (a int, b int);
INSERT INTO notnull_tbl1_upg VALUES (NULL, 1), (NULL, 2), (300, 3);
ALTER TABLE notnull_tbl1_upg ADD CONSTRAINT nn NOT NULL a NOT VALID;
-- Inherit test for pg_upgrade
CREATE TABLE notnull_parent_upg (a int);
CREATE TABLE notnull_child_upg () INHERITS (notnull_parent_upg);
ALTER TABLE notnull_child_upg ADD CONSTRAINT nn NOT NULL a;
ALTER TABLE notnull_parent_upg ADD CONSTRAINT nn NOT NULL a NOT VALID;
SELECT conrelid::regclass, contype, convalidated, conislocal
FROM pg_catalog.pg_constraint
WHERE conrelid in ('notnull_parent_upg'::regclass, 'notnull_child_upg'::regclass)
ORDER BY 1;
-- Partition table test, for pg_upgrade
CREATE TABLE notnull_part1_upg (a int, b int) PARTITION BY LIST (a);
ALTER TABLE notnull_part1_upg ADD CONSTRAINT notnull_con NOT NULL a NOT VALID; --ok
CREATE TABLE notnull_part1_1_upg PARTITION OF notnull_part1_upg FOR VALUES IN (1,2);
CREATE TABLE notnull_part1_2_upg (a int, CONSTRAINT nn2 NOT NULL a, b int);
ALTER TABLE notnull_part1_upg ATTACH PARTITION notnull_part1_2_upg FOR VALUES IN (3,4);
CREATE TABLE notnull_part1_3_upg (a int, b int);
INSERT INTO notnull_part1_3_upg values(NULL,1);
ALTER TABLE notnull_part1_3_upg add CONSTRAINT nn3 NOT NULL a NOT VALID;
ALTER TABLE notnull_part1_upg ATTACH PARTITION notnull_part1_3_upg FOR VALUES IN (NULL,5);
EXECUTE get_nnconstraint_info('{notnull_part1_upg, notnull_part1_1_upg, notnull_part1_2_upg, notnull_part1_3_upg}');
DEALLOCATE get_nnconstraint_info;
-- end NOT NULL NOT VALID
-- Comments
-- Setup a low-level role to enforce non-superuser checks.
CREATE ROLE regress_constraint_comments;