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Diffstat (limited to 'src/backend/executor/nodeMergejoin.c')
| -rw-r--r-- | src/backend/executor/nodeMergejoin.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/backend/executor/nodeMergejoin.c b/src/backend/executor/nodeMergejoin.c index 925b4cf5535..eef03825bd9 100644 --- a/src/backend/executor/nodeMergejoin.c +++ b/src/backend/executor/nodeMergejoin.c @@ -1502,6 +1502,10 @@ ExecInitMergeJoin(MergeJoin *node, EState *estate, int eflags) * * Currently, only Material wants the extra MARKs, and it will be helpful * only if eflags doesn't specify REWIND. + * + * Note that for IndexScan and IndexOnlyScan, it is *necessary* that we + * not set mj_ExtraMarks; otherwise we might attempt to set a mark before + * the first inner tuple, which they do not support. */ if (IsA(innerPlan(node), Material) && (eflags & EXEC_FLAG_REWIND) == 0 && |