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Diffstat (limited to 'src/backend/executor/nodeMergeAppend.c')
| -rw-r--r-- | src/backend/executor/nodeMergeAppend.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/backend/executor/nodeMergeAppend.c b/src/backend/executor/nodeMergeAppend.c index 4e200a8e346..0c814f0e72d 100644 --- a/src/backend/executor/nodeMergeAppend.c +++ b/src/backend/executor/nodeMergeAppend.c @@ -137,6 +137,15 @@ ExecInitMergeAppend(MergeAppend *node, EState *estate, int eflags) sortKey->ssup_nulls_first = node->nullsFirst[i]; sortKey->ssup_attno = node->sortColIdx[i]; + /* + * It isn't feasible to perform abbreviated key conversion, since + * tuples are pulled into mergestate's binary heap as needed. It would + * likely be counter-productive to convert tuples into an abbreviated + * representation as they're pulled up, so opt out of that additional + * optimization entirely. + */ + sortKey->abbreviate = false; + PrepareSortSupportFromOrderingOp(node->sortOperators[i], sortKey); } |