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Fix tablespace inheritance for partitioned rels

Browse Source 
Commit ca4103025d left a few loose ends.  The most important one
(broken pg_dump output) is already fixed by virtue of commit
3b23552ad8, but some things remained:

* When ALTER TABLE rewrites tables, the indexes must remain in the
  tablespace they were originally in.  This didn't work because
  index recreation during ALTER TABLE runs manufactured SQL (yuck),
  which runs afoul of default_tablespace in competition with the parent
  relation tablespace.  To fix, reset default_tablespace to the empty
  string temporarily, and add the TABLESPACE clause as appropriate.

* Setting a partitioned rel's tablespace to the database default is
  confusing; if it worked, it would direct the partitions to that
  tablespace regardless of default_tablespace.  But in reality it does
  not work, and making it work is a larger project.  Therefore, throw
  an error when this condition is detected, to alert the unwary.

Add some docs and tests, too.

Author: Álvaro Herrera
Discussion: https://postgr.es/m/CAKJS1f_1c260nOt_vBJ067AZ3JXptXVRohDVMLEBmudX1YEx-A@mail.gmail.com
This commit is contained in:
Alvaro Herrera
2019-04-25 10:20:23 -04:00
parent 3b23552ad8
commit 87259588d0
18 changed files with 519 additions and 34 deletions
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34
src/backend/commands/tablecmds.c
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@ -567,6 +567,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
Datum reloptions;
ListCell *listptr;
AttrNumber attnum;
bool partitioned;
static char *validnsps[] = HEAP_RELOPT_NAMESPACES;
Oid ofTypeId;
ObjectAddress address;
@ -595,7 +596,10 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
elog(ERROR, "unexpected relkind: %d", (int) relkind);
relkind = RELKIND_PARTITIONED_TABLE;
partitioned = true;
}
else
partitioned = false;
/*
* Look up the namespace in which we are supposed to create the relation,
@ -664,31 +668,24 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
if (stmt->tablespacename)
{
tablespaceId = get_tablespace_oid(stmt->tablespacename, false);
if (partitioned && tablespaceId == MyDatabaseTableSpace)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot specify default tablespace for partitioned relations")));
}
else if (stmt->partbound)
{
HeapTuple tup;
/*
* For partitions, when no other tablespace is specified, we default
* the tablespace to the parent partitioned table's.
*/
Assert(list_length(inheritOids) == 1);
tup = SearchSysCache1(RELOID,
DatumGetObjectId(linitial_oid(inheritOids)));
tablespaceId = ((Form_pg_class) GETSTRUCT(tup))->reltablespace;
if (!OidIsValid(tablespaceId))
tablespaceId = GetDefaultTablespace(stmt->relation->relpersistence);
ReleaseSysCache(tup);
tablespaceId = get_rel_tablespace(linitial_oid(inheritOids));
}
else
{
tablespaceId = GetDefaultTablespace(stmt->relation->relpersistence);
/* note InvalidOid is OK in this case */
}
tablespaceId = GetDefaultTablespace(stmt->relation->relpersistence,
partitioned);
/* Check permissions except when using database's default */
if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
@ -825,7 +822,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
{
accessMethod = stmt->accessMethod;
if (relkind == RELKIND_PARTITIONED_TABLE)
if (partitioned)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("specifying a table access method is not supported on a partitioned table")));
@ -998,7 +995,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
* Process the partitioning specification (if any) and store the partition
* key information into the catalog.
*/
if (stmt->partspec)
if (partitioned)
{
ParseState *pstate;
char strategy;
@ -11276,6 +11273,7 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
if (!rewrite)
TryReuseIndex(oldId, stmt);
stmt->reset_default_tblspc = true;
/* keep the index's comment */
stmt->idxcomment = GetComment(oldId, RelationRelationId, 0);
@ -11307,6 +11305,7 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
/* keep any comment on the index */
indstmt->idxcomment = GetComment(indoid,
RelationRelationId, 0);
indstmt->reset_default_tblspc = true;
cmd->subtype = AT_ReAddIndex;
tab->subcmds[AT_PASS_OLD_INDEX] =
@ -11329,6 +11328,7 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
if (con->contype == CONSTR_FOREIGN &&
!rewrite && tab->rewrite == 0)
TryReuseForeignKey(oldId, con);
con->reset_default_tblspc = true;
cmd->subtype = AT_ReAddConstraint;
tab->subcmds[AT_PASS_OLD_CONSTR] =
lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);