diff options
Diffstat (limited to 'src/backend/utils/sort/tuplesort.c')
| -rw-r--r-- | src/backend/utils/sort/tuplesort.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c index b17347b2141..9f1df874389 100644 --- a/src/backend/utils/sort/tuplesort.c +++ b/src/backend/utils/sort/tuplesort.c @@ -975,6 +975,7 @@ tuplesort_begin_cluster(TupleDesc tupDesc, { Tuplesortstate *state = tuplesort_begin_common(workMem, coordinate, randomAccess); + AttrNumber leading; BTScanInsert indexScanKey; MemoryContext oldcontext; int i; @@ -1007,6 +1008,7 @@ tuplesort_begin_cluster(TupleDesc tupDesc, state->abbrevNext = 10; state->indexInfo = BuildIndexInfo(indexRel); + leading = state->indexInfo->ii_IndexAttrNumbers[0]; state->tupDesc = tupDesc; /* assume we need not copy tupDesc */ @@ -1045,7 +1047,7 @@ tuplesort_begin_cluster(TupleDesc tupDesc, (scanKey->sk_flags & SK_BT_NULLS_FIRST) != 0; sortKey->ssup_attno = scanKey->sk_attno; /* Convey if abbreviation optimization is applicable in principle */ - sortKey->abbreviate = (i == 0); + sortKey->abbreviate = (i == 0 && leading != 0); AssertState(sortKey->ssup_attno != 0); |