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Revert patch pending more discussion:

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Disallow changing DEFAULT expression of a SERIAL column.
This commit is contained in:
Bruce Momjian 2006-04-30 01:08:07 +00:00
parent 366682fb66
commit 782df58a1c
7 changed files with 9 additions and 153 deletions
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4
doc/TODO
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@ -2,7 +2,7 @@
PostgreSQL TODO List PostgreSQL TODO List
==================== ====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Sat Apr 29 12:44:26 EDT 2006 Last updated: Thu Apr 27 11:56:04 EDT 2006
The most recent version of this document can be viewed at The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html. http://www.postgresql.org/docs/faqs.TODO.html.
@ -200,7 +200,7 @@ Data Types
The positive modulus result returned by NUMERICs might be considered The positive modulus result returned by NUMERICs might be considered
inaccurate, in one sense. inaccurate, in one sense.
* -Disallow changing default expression of a SERIAL column * %Disallow changing default expression of a SERIAL column
* %Disallow ALTER SEQUENCE changes for SERIAL sequences because pg_dump * %Disallow ALTER SEQUENCE changes for SERIAL sequences because pg_dump
does not dump the changes does not dump the changes
* Fix data types where equality comparison isn't intuitive, e.g. box * Fix data types where equality comparison isn't intuitive, e.g. box

4
doc/src/FAQ/TODO.html
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@ -8,7 +8,7 @@
<body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF"> <body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF">
<h1><a name="section_1">PostgreSQL TODO List</a></h1> <h1><a name="section_1">PostgreSQL TODO List</a></h1>
<p>Current maintainer: Bruce Momjian (<a href="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</a>)<br/> <p>Current maintainer: Bruce Momjian (<a href="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</a>)<br/>
Last updated: Sat Apr 29 12:44:26 EDT 2006 Last updated: Thu Apr 27 11:56:04 EDT 2006
</p> </p>
<p>The most recent version of this document can be viewed at<br/> <p>The most recent version of this document can be viewed at<br/>
<a href="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>. <a href="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>.
@ -185,7 +185,7 @@ first.
inaccurate, in one sense. inaccurate, in one sense.
</p> </p>
<ul> <ul>
<li>-<em>Disallow changing default expression of a SERIAL column</em> <li>%Disallow changing default expression of a SERIAL column
</li><li>%Disallow ALTER SEQUENCE changes for SERIAL sequences because pg_dump </li><li>%Disallow ALTER SEQUENCE changes for SERIAL sequences because pg_dump
does not dump the changes does not dump the changes
</li><li>Fix data types where equality comparison isn't intuitive, e.g. box </li><li>Fix data types where equality comparison isn't intuitive, e.g. box

88
src/backend/catalog/dependency.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/catalog/dependency.c,v 1.52 2006/04/29 16:43:54 momjian Exp $ * $PostgreSQL: pgsql/src/backend/catalog/dependency.c,v 1.53 2006/04/30 01:08:06 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -1931,89 +1931,3 @@ getRelationDescription(StringInfo buffer, Oid relid)
ReleaseSysCache(relTup); ReleaseSysCache(relTup);
} }
/* Recursively travel and search for the default sequence. Finally detach it */
void performSequenceDefaultDeletion(const ObjectAddress *object,
DropBehavior behavior, int deleteFlag)
{
ScanKeyData key[3];
int nkeys;
SysScanDesc scan;
HeapTuple tup;
ObjectAddress otherObject;
Relation depRel;
depRel = heap_open(DependRelationId, RowExclusiveLock);
ScanKeyInit(&key[0],
Anum_pg_depend_classid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->classId));
ScanKeyInit(&key[1],
Anum_pg_depend_objid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->objectId));
if (object->objectSubId != 0)
{
ScanKeyInit(&key[2],
Anum_pg_depend_objsubid,
BTEqualStrategyNumber, F_INT4EQ,
Int32GetDatum(object->objectSubId));
nkeys = 3;
}
else
nkeys = 2;
scan = systable_beginscan(depRel, DependDependerIndexId, true,
SnapshotNow, nkeys, key);
while (HeapTupleIsValid(tup = systable_getnext(scan)))
{
Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup);
otherObject.classId = foundDep->refclassid;
otherObject.objectId = foundDep->refobjid;
otherObject.objectSubId = foundDep->refobjsubid;
/* Detach the default sequence from the relation */
if(deleteFlag == 1)
{
simple_heap_delete(depRel, &tup->t_self);
break;
}
switch (foundDep->deptype)
{
case DEPENDENCY_NORMAL:
{
if(getObjectClass(&otherObject) == OCLASS_CLASS)
{
/* Dont allow to change the default sequence */
if(deleteFlag == 2)
{
systable_endscan(scan);
heap_close(depRel, RowExclusiveLock);
elog(ERROR, "%s is a SERIAL sequence. Can't alter the relation", getObjectDescription(&otherObject));
return;
}
else /* Detach the default sequence from the relation */
{
performSequenceDefaultDeletion(&otherObject, behavior, 1);
systable_endscan(scan);
heap_close(depRel, RowExclusiveLock);
return;
}
}
}
}
}
systable_endscan(scan);
heap_close(depRel, RowExclusiveLock);
}

49
src/backend/catalog/heap.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/catalog/heap.c,v 1.297 2006/04/29 16:43:54 momjian Exp $ * $PostgreSQL: pgsql/src/backend/catalog/heap.c,v 1.298 2006/04/30 01:08:06 momjian Exp $
* *
* *
* INTERFACE ROUTINES * INTERFACE ROUTINES
@ -2136,50 +2136,3 @@ heap_truncate_find_FKs(List *relationIds)
return result; return result;
} }
/* Detach the default sequence and the relation */
void
RemoveSequenceDefault(Oid relid, AttrNumber attnum,
DropBehavior behavior, bool flag)
{
Relation attrdef_rel;
ScanKeyData scankeys[2];
SysScanDesc scan;
HeapTuple tuple;
attrdef_rel = heap_open(AttrDefaultRelationId, RowExclusiveLock);
ScanKeyInit(&scankeys[0],
Anum_pg_attrdef_adrelid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(relid));
ScanKeyInit(&scankeys[1],
Anum_pg_attrdef_adnum,
BTEqualStrategyNumber, F_INT2EQ,
Int16GetDatum(attnum));
scan = systable_beginscan(attrdef_rel, AttrDefaultIndexId, true,
SnapshotNow, 2, scankeys);
/* There should be at most one matching tuple, but we loop anyway */
while (HeapTupleIsValid(tuple = systable_getnext(scan)))
{
ObjectAddress object;
object.classId = AttrDefaultRelationId;
object.objectId = HeapTupleGetOid(tuple);
object.objectSubId = 0;
if(flag == true) /* Detach the sequence */
performSequenceDefaultDeletion(&object, behavior, 0);
else /* Don't allow to change the default sequence */
performSequenceDefaultDeletion(&object, behavior, 2);
}
systable_endscan(scan);
heap_close(attrdef_rel, RowExclusiveLock);
}

7
src/backend/commands/tablecmds.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.182 2006/04/29 16:43:54 momjian Exp $ * $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.183 2006/04/30 01:08:07 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -3362,11 +3362,6 @@ ATExecColumnDefault(Relation rel, const char *colName,
* safety, but at present we do not expect anything to depend on the * safety, but at present we do not expect anything to depend on the
* default. * default.
*/ */
if (newDefault)
RemoveSequenceDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, false);
else
RemoveSequenceDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, true);
RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, false); RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, false);
if (newDefault) if (newDefault)

5
src/include/catalog/dependency.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* $PostgreSQL: pgsql/src/include/catalog/dependency.h,v 1.22 2006/04/29 16:43:54 momjian Exp $ * $PostgreSQL: pgsql/src/include/catalog/dependency.h,v 1.23 2006/04/30 01:08:07 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -207,7 +207,4 @@ extern void shdepDropOwned(List *relids, DropBehavior behavior);
extern void shdepReassignOwned(List *relids, Oid newrole); extern void shdepReassignOwned(List *relids, Oid newrole);
extern void performSequenceDefaultDeletion(const ObjectAddress *object,
DropBehavior behavior, int deleteFlag);
#endif /* DEPENDENCY_H */ #endif /* DEPENDENCY_H */

5
src/include/catalog/heap.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* $PostgreSQL: pgsql/src/include/catalog/heap.h,v 1.79 2006/04/29 16:43:54 momjian Exp $ * $PostgreSQL: pgsql/src/include/catalog/heap.h,v 1.80 2006/04/30 01:08:07 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -97,7 +97,4 @@ extern void CheckAttributeNamesTypes(TupleDesc tupdesc, char relkind);
extern void CheckAttributeType(const char *attname, Oid atttypid); extern void CheckAttributeType(const char *attname, Oid atttypid);
extern void RemoveSequenceDefault(Oid relid, AttrNumber attnum,
DropBehavior behavior, bool flag);
#endif /* HEAP_H */ #endif /* HEAP_H */