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Fix handling of non-key columns get_index_column_opclass()

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f2e40380 introduces support of non-key attributes in GiST indexes.  Then if
get_index_column_opclass() is asked by gistproperty() to get an opclass of
non-key column, it returns garbage past oidvector value.  This commit fixes
that by making get_index_column_opclass() return InvalidOid in this case.

Discussion: https://postgr.es/m/20190902231948.GA5343%40alvherre.pgsql
Author: Nikita Glukhov, Alexander Korotkov
Backpatch-through: 12
This commit is contained in:
Alexander Korotkov 2019-09-09 13:50:12 +03:00
parent 89b160c320
commit 7e04160390
1 changed files with 11 additions and 1 deletions
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12
src/backend/utils/cache/lsyscache.c vendored
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@ -3157,7 +3157,8 @@ get_range_subtype(Oid rangeOid)
*
* Given the index OID and column number,
* return opclass of the index column
* or InvalidOid if the index was not found.
* or InvalidOid if the index was not found
* or column is non-key one.
*/
Oid
get_index_column_opclass(Oid index_oid, int attno)
@ -3180,11 +3181,20 @@ get_index_column_opclass(Oid index_oid, int attno)
/* caller is supposed to guarantee this */
Assert(attno > 0 && attno <= rd_index->indnatts);
/* Non-key attributes don't have an opclass */
if (attno > rd_index->indnkeyatts)
{
ReleaseSysCache(tuple);
return InvalidOid;
}
datum = SysCacheGetAttr(INDEXRELID, tuple,
Anum_pg_index_indclass, &isnull);
Assert(!isnull);
indclass = ((oidvector *) DatumGetPointer(datum));
Assert(attno <= indclass->dim1);
opclass = indclass->values[attno - 1];
ReleaseSysCache(tuple);