diff options
Diffstat (limited to 'src/backend/utils/sort/sortsupport.c')
| -rw-r--r-- | src/backend/utils/sort/sortsupport.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/backend/utils/sort/sortsupport.c b/src/backend/utils/sort/sortsupport.c index fcfe6e831a1..c436fbb4ce1 100644 --- a/src/backend/utils/sort/sortsupport.c +++ b/src/backend/utils/sort/sortsupport.c @@ -15,6 +15,7 @@ #include "postgres.h" +#include "access/gist.h" #include "access/nbtree.h" #include "catalog/pg_am.h" #include "fmgr.h" @@ -175,3 +176,36 @@ PrepareSortSupportFromIndexRel(Relation indexRel, int16 strategy, FinishSortSupportFunction(opfamily, opcintype, ssup); } + +/* + * Fill in SortSupport given a GiST index relation + * + * Caller must previously have zeroed the SortSupportData structure and then + * filled in ssup_cxt, ssup_attno, ssup_collation, and ssup_nulls_first. This + * will fill in ssup_reverse (always false for GiST index build), as well as + * the comparator function pointer. + */ +void +PrepareSortSupportFromGistIndexRel(Relation indexRel, SortSupport ssup) +{ + Oid opfamily = indexRel->rd_opfamily[ssup->ssup_attno - 1]; + Oid opcintype = indexRel->rd_opcintype[ssup->ssup_attno - 1]; + Oid sortSupportFunction; + + Assert(ssup->comparator == NULL); + + if (indexRel->rd_rel->relam != GIST_AM_OID) + elog(ERROR, "unexpected non-gist AM: %u", indexRel->rd_rel->relam); + ssup->ssup_reverse = false; + + /* + * Look up the sort support function. This is simpler than for B-tree + * indexes because we don't support the old-style btree comparators. + */ + sortSupportFunction = get_opfamily_proc(opfamily, opcintype, opcintype, + GIST_SORTSUPPORT_PROC); + if (!OidIsValid(sortSupportFunction)) + elog(ERROR, "missing support function %d(%u,%u) in opfamily %u", + GIST_SORTSUPPORT_PROC, opcintype, opcintype, opfamily); + OidFunctionCall1(sortSupportFunction, PointerGetDatum(ssup)); +} |