mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2025-02-05 19:09:58 +08:00
Code Issues Packages Projects Releases Wiki Activity

Prevent clustering on incomplete indexes: partial indexes are verboten,

Browse Source 
as are non-amindexnulls AMs unless first column is attnotnull.
This commit is contained in:
Tom Lane 2003-03-03 04:37:37 +00:00
parent d28cd2273b
commit a455c94257
1 changed files with 30 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
src/backend/commands/cluster.c
View File

@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/cluster.c,v 1.105 2003/02/09 06:56:26 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/cluster.c,v 1.106 2003/03/03 04:37:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -160,6 +160,7 @@ cluster(ClusterStmt *stmt)
stmt->indexname, stmt->relation->relname);
}
/* All other checks are done in cluster_rel() */
rvtc.tableOid = tableOid;
rvtc.indexOid = indexOid;
@ -313,6 +314,34 @@ cluster_rel(RelToCluster *rvtc, bool recheck)
RelationGetRelationName(OldIndex),
RelationGetRelationName(OldHeap));
/*
* Disallow clustering on incomplete indexes (those that might not index
* every row of the relation). We could relax this by making a separate
* seqscan pass over the table to copy the missing rows, but that seems
* expensive and tedious.
*/
if (VARSIZE(&OldIndex->rd_index->indpred) > VARHDRSZ) /* partial? */
elog(ERROR, "CLUSTER: cannot cluster on partial index");
if (!OldIndex->rd_am->amindexnulls)
{
AttrNumber colno;
/*
* If the AM doesn't index nulls, then it's a partial index unless
* we can prove all the rows are non-null. Note we only need look
* at the first column; multicolumn-capable AMs are *required* to
* index nulls in columns after the first.
*/
if (OidIsValid(OldIndex->rd_index->indproc))
elog(ERROR, "CLUSTER: cannot cluster on functional index when index access method does not handle nulls");
colno = OldIndex->rd_index->indkey[0];
if (colno > 0) /* system columns are non-null */
if (!OldHeap->rd_att->attrs[colno - 1]->attnotnull)
elog(ERROR, "CLUSTER: cannot cluster when index access method does not handle nulls"
"\n\tYou may be able to work around this by marking column \"%s\" NOT NULL",
NameStr(OldHeap->rd_att->attrs[colno - 1]->attname));
}
/*
* Disallow clustering system relations. This will definitely NOT
* work for shared relations (we have no way to update pg_class rows