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Code

Removed obsolete DROP_COLUMN_HACK stuff.

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This commit is contained in:
Hiroshi Inoue 2002-04-02 08:51:52 +00:00
parent b4bedfa956
commit c26a44db08
5 changed files with 5 additions and 331 deletions
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300
src/backend/commands/command.c
View File

@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.171 2002/04/01 22:36:09 tgl Exp $ * $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.172 2002/04/02 08:51:50 inoue Exp $
* *
* NOTES * NOTES
* The PerformAddAttribute() code, like most of the relation * The PerformAddAttribute() code, like most of the relation
@ -1115,140 +1115,6 @@ AlterTableAlterColumnFlags(Oid myrelid,
} }
#ifdef _DROP_COLUMN_HACK__
/*
* ALTER TABLE DROP COLUMN trial implementation
*/
/*
* find a specified attribute in a node entry
*/
static bool
find_attribute_walker(Node *node, int *attnump)
{
if (node == NULL)
return false;
if (IsA(node, Var))
{
Var *var = (Var *) node;
if (var->varlevelsup == 0 && var->varno == 1 &&
var->varattno == *attnump)
return true;
}
return expression_tree_walker(node, find_attribute_walker,
(void *) attnump);
}
static bool
find_attribute_in_node(Node *node, int attnum)
{
return find_attribute_walker(node, &attnum);
}
/*
* Remove/check references for the column
*/
static bool
RemoveColumnReferences(Oid reloid, int attnum, bool checkonly, HeapTuple reltup)
{
Relation indexRelation,
rcrel;
ScanKeyData entry;
HeapScanDesc scan;
void *sysscan;
HeapTuple htup,
indexTuple;
Form_pg_index index;
Form_pg_class pgcform = (Form_pg_class) NULL;
int i;
bool checkok = true;
if (!checkonly)
pgcform = (Form_pg_class) GETSTRUCT(reltup);
/*
* Remove/check constraints here
*/
ScanKeyEntryInitialize(&entry, (bits16) 0x0,
Anum_pg_relcheck_rcrelid,
(RegProcedure) F_OIDEQ,
ObjectIdGetDatum(reloid));
rcrel = heap_openr(RelCheckRelationName, RowExclusiveLock);
sysscan = systable_beginscan(rcrel, RelCheckIndex, true,
SnapshotNow,
1, &entry);
while (HeapTupleIsValid(htup = systable_getnext(sysscan)))
{
Form_pg_relcheck relcheck;
char *ccbin;
Node *node;
relcheck = (Form_pg_relcheck) GETSTRUCT(htup);
ccbin = DatumGetCString(DirectFunctionCall1(textout,
PointerGetDatum(&relcheck->rcbin)));
node = stringToNode(ccbin);
pfree(ccbin);
if (find_attribute_in_node(node, attnum))
{
if (checkonly)
{
checkok = false;
elog(ERROR, "target column is used in a constraint");
}
else
{
simple_heap_delete(rcrel, &htup->t_self);
pgcform->relchecks--;
}
}
}
systable_endscan(sysscan);
heap_close(rcrel, NoLock);
/*
* What to do with triggers/rules/views/procedues ?
*/
/*
* Remove/check indexes
*/
indexRelation = heap_openr(IndexRelationName, RowExclusiveLock);
ScanKeyEntryInitialize(&entry, 0, Anum_pg_index_indrelid, F_OIDEQ,
ObjectIdGetDatum(reloid));
scan = heap_beginscan(indexRelation, false, SnapshotNow, 1, &entry);
while (HeapTupleIsValid(indexTuple = heap_getnext(scan, 0)))
{
index = (Form_pg_index) GETSTRUCT(indexTuple);
for (i = 0; i < INDEX_MAX_KEYS; i++)
{
if (index->indkey[i] == InvalidAttrNumber)
break;
else if (index->indkey[i] == attnum)
{
if (checkonly)
{
checkok = false;
elog(ERROR, "target column is used in an index");
}
else
{
index_drop(index->indexrelid);
}
break;
}
}
}
heap_endscan(scan);
heap_close(indexRelation, NoLock);
return checkok;
}
#endif /* _DROP_COLUMN_HACK__ */
/* /*
* ALTER TABLE DROP COLUMN * ALTER TABLE DROP COLUMN
@ -1258,171 +1124,7 @@ AlterTableDropColumn(Oid myrelid,
bool inh, const char *colName, bool inh, const char *colName,
int behavior) int behavior)
{ {
#ifdef _DROP_COLUMN_HACK__
Relation rel,
attrdesc;
HeapTuple reltup;
HeapTupleData classtuple;
Buffer buffer;
Form_pg_attribute attribute;
HeapTuple tup;
Relation idescs[Num_pg_attr_indices];
int attnum;
bool hasindex;
char dropColname[32];
if (inh)
elog(ERROR, "ALTER TABLE / DROP COLUMN with inherit option is not supported yet");
/*
* Grab an exclusive lock on the target table, which we will NOT
* release until end of transaction.
*/
rel = heap_open(myrelid, AccessExclusiveLock);
if (rel->rd_rel->relkind != RELKIND_RELATION)
elog(ERROR, "ALTER TABLE: relation \"%s\" is not a table",
RelationGetRelationName(rel));
if (!allowSystemTableMods
&& IsSystemRelationName(RelationGetRelationName(rel)))
elog(ERROR, "ALTER TABLE: relation \"%s\" is a system catalog",
RelationGetRelationName(rel));
/*
* permissions checking. this would normally be done in utility.c,
* but this particular routine is recursive.
*
* normally, only the owner of a class can change its schema.
*/
if (!pg_class_ownercheck(myrelid, GetUserId()))
elog(ERROR, "ALTER TABLE: \"%s\": permission denied",
RelationGetRelationName(rel));
heap_close(rel, NoLock); /* close rel but keep lock! */
/*
* What to do when rel has inheritors ?
*/
if (length(find_all_inheritors(myrelid)) > 1)
elog(ERROR, "ALTER TABLE: cannot drop a column on table that is inherited from");
/*
* lock the pg_class tuple for update
*/
rel = heap_openr(RelationRelationName, RowExclusiveLock);
reltup = SearchSysCache(RELOID,
ObjectIdGetDatum(myrelid),
0, 0, 0);
if (!HeapTupleIsValid(reltup))
{
Relation myrel;
char *myrelname;
myrel = heap_open(myrelid, AccessExclusiveLock);
myrelname = pstrdup(RelationGetRelationName(myrel));
heap_close(myrel, AccessExclusiveLock);
elog(ERROR, "ALTER TABLE: relation \"%s\" not found",
myrelname);
}
classtuple.t_self = reltup->t_self;
ReleaseSysCache(reltup);
switch (heap_mark4update(rel, &classtuple, &buffer))
{
case HeapTupleSelfUpdated:
case HeapTupleMayBeUpdated:
break;
default:
elog(ERROR, "couldn't lock pg_class tuple");
}
reltup = heap_copytuple(&classtuple);
ReleaseBuffer(buffer);
attrdesc = heap_openr(AttributeRelationName, RowExclusiveLock);
/*
* Get the target pg_attribute tuple and make a modifiable copy
*/
tup = SearchSysCacheCopy(ATTNAME,
ObjectIdGetDatum(myrelid),
PointerGetDatum(colName),
0, 0);
if (!HeapTupleIsValid(tup))
{
Relation myrel;
char *myrelname;
myrel = heap_open(myrelid, AccessExclusiveLock);
myrelname = pstrdup(RelationGetRelationName(myrel));
heap_close(myrel, AccessExclusiveLock);
elog(ERROR, "ALTER TABLE: column name \"%s\" doesn't exist in table \"%s\"",
colName, myrelname);
}
attribute = (Form_pg_attribute) GETSTRUCT(tup);
attnum = attribute->attnum;
if (attnum <= 0)
elog(ERROR, "ALTER TABLE: column name \"%s\" was already dropped",
colName);
/*
* Check constraints/indices etc here
*/
if (behavior != CASCADE)
{
if (!RemoveColumnReferences(myrelid, attnum, true, NULL))
elog(ERROR, "the column is referenced");
}
/*
* change the target pg_attribute tuple
*/
sprintf(dropColname, "*already Dropped*%d", attnum);
namestrcpy(&(attribute->attname), dropColname);
ATTRIBUTE_DROP_COLUMN(attribute);
simple_heap_update(attrdesc, &tup->t_self, tup);
hasindex = (!IsIgnoringSystemIndexes() && RelationGetForm(attrdesc)->relhasindex);
if (hasindex)
{
CatalogOpenIndices(Num_pg_attr_indices, Name_pg_attr_indices, idescs);
CatalogIndexInsert(idescs, Num_pg_attr_indices,
attrdesc, tup);
CatalogCloseIndices(Num_pg_attr_indices, idescs);
}
heap_close(attrdesc, NoLock);
heap_freetuple(tup);
/* delete comment for this attribute only */
CreateComments(RelationGetRelid(rel), RelOid_pg_class,
(int32) attnum, NULL);
/* delete attrdef */
drop_default(myrelid, attnum);
/*
* Remove objects which reference this column
*/
if (behavior == CASCADE)
{
Relation ridescs[Num_pg_class_indices];
RemoveColumnReferences(myrelid, attnum, false, reltup);
/* update pg_class tuple */
simple_heap_update(rel, &reltup->t_self, reltup);
CatalogOpenIndices(Num_pg_class_indices, Name_pg_class_indices, ridescs);
CatalogIndexInsert(ridescs, Num_pg_class_indices, rel, reltup);
CatalogCloseIndices(Num_pg_class_indices, ridescs);
}
heap_freetuple(reltup);
heap_close(rel, NoLock);
#else
elog(ERROR, "ALTER TABLE / DROP COLUMN is not implemented"); elog(ERROR, "ALTER TABLE / DROP COLUMN is not implemented");
#endif /* _DROP_COLUMN_HACK__ */
} }

7
src/backend/optimizer/prep/preptlist.c
View File

@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/preptlist.c,v 1.50 2002/03/20 19:44:15 tgl Exp $ * $Header: /cvsroot/pgsql/src/backend/optimizer/prep/preptlist.c,v 1.51 2002/04/02 08:51:51 inoue Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -198,11 +198,6 @@ expand_targetlist(List *tlist, int command_type,
new_expr = build_column_default(rel, attrno); new_expr = build_column_default(rel, attrno);
break; break;
case CMD_UPDATE: case CMD_UPDATE:
#ifdef _DROP_COLUMN_HACK__
if (COLUMN_IS_DROPPED(att_tup))
new_expr = (Node *) makeNullConst(atttype);
else
#endif /* _DROP_COLUMN_HACK__ */
new_expr = (Node *) makeVar(result_relation, new_expr = (Node *) makeVar(result_relation,
attrno, attrno,
atttype, atttype,

7
src/backend/parser/parse_relation.c
View File

@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_relation.c,v 1.66 2002/03/26 19:15:59 tgl Exp $ * $Header: /cvsroot/pgsql/src/backend/parser/parse_relation.c,v 1.67 2002/04/02 08:51:51 inoue Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -855,11 +855,6 @@ expandRTE(ParseState *pstate, RangeTblEntry *rte,
{ {
Form_pg_attribute attr = rel->rd_att->attrs[varattno]; Form_pg_attribute attr = rel->rd_att->attrs[varattno];
#ifdef _DROP_COLUMN_HACK__
if (COLUMN_IS_DROPPED(attr))
continue;
#endif /* _DROP_COLUMN_HACK__ */
if (colnames) if (colnames)
{ {
char *label; char *label;

6
src/backend/parser/parse_target.c
View File

@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.80 2002/03/29 19:06:12 tgl Exp $ * $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.81 2002/04/02 08:51:52 inoue Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -373,10 +373,6 @@ checkInsertTargets(ParseState *pstate, List *cols, List **attrnos)
{ {
ResTarget *col = makeNode(ResTarget); ResTarget *col = makeNode(ResTarget);
#ifdef _DROP_COLUMN_HACK__
if (COLUMN_IS_DROPPED(attr[i]))
continue;
#endif /* _DROP_COLUMN_HACK__ */
col->name = pstrdup(NameStr(attr[i]->attname)); col->name = pstrdup(NameStr(attr[i]->attname));
col->indirection = NIL; col->indirection = NIL;
col->val = NULL; col->val = NULL;

16
src/include/catalog/pg_attribute.h
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* $Id: pg_attribute.h,v 1.87 2002/03/29 19:06:18 tgl Exp $ * $Id: pg_attribute.h,v 1.88 2002/04/02 08:51:49 inoue Exp $
* *
* NOTES * NOTES
* the genbki.sh script reads this file and generates .bki * the genbki.sh script reads this file and generates .bki
@ -182,20 +182,6 @@ typedef FormData_pg_attribute *Form_pg_attribute;
#define Anum_pg_attribute_atthasdef 15 #define Anum_pg_attribute_atthasdef 15
#ifdef _DROP_COLUMN_HACK__
/*
* CONSTANT and MACROS for DROP COLUMN implementation
*/
#define DROP_COLUMN_OFFSET -20
#define COLUMN_IS_DROPPED(attribute) ((attribute)->attnum <= DROP_COLUMN_OFFSET)
#define DROPPED_COLUMN_INDEX(attidx) (DROP_COLUMN_OFFSET - attidx)
#define ATTRIBUTE_DROP_COLUMN(attribute) \
Assert((attribute)->attnum > 0); \
(attribute)->attnum = DROPPED_COLUMN_INDEX((attribute)->attnum); \
(attribute)->atttypid = (Oid) -1; \
(attribute)->attnotnull = false; \
(attribute)->atthasdef = false;
#endif /* _DROP_COLUMN_HACK__ */
/* ---------------- /* ----------------
* SCHEMA_ macros for declaring hardcoded tuple descriptors. * SCHEMA_ macros for declaring hardcoded tuple descriptors.