diff options
Diffstat (limited to 'src/backend/executor/nodeRecursiveunion.c')
| -rw-r--r-- | src/backend/executor/nodeRecursiveunion.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/backend/executor/nodeRecursiveunion.c b/src/backend/executor/nodeRecursiveunion.c index 39be4cdc3b1..b577b72b50c 100644 --- a/src/backend/executor/nodeRecursiveunion.c +++ b/src/backend/executor/nodeRecursiveunion.c @@ -37,10 +37,14 @@ build_hash_table(RecursiveUnionState *rustate) Assert(node->numCols > 0); Assert(node->numGroups > 0); - /* XXX is it worth working a bit harder to determine the inputOps here? */ + /* + * If both child plans deliver the same fixed tuple slot type, we can tell + * BuildTupleHashTableExt to expect that slot type as input. Otherwise, + * we'll pass NULL denoting that any slot type is possible. + */ rustate->hashtable = BuildTupleHashTableExt(&rustate->ps, desc, - NULL, + ExecGetCommonChildSlotOps(&rustate->ps), node->numCols, node->dupColIdx, rustate->eqfuncoids, |