diff options
Diffstat (limited to 'src/backend/executor/execGrouping.c')
| -rw-r--r-- | src/backend/executor/execGrouping.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/src/backend/executor/execGrouping.c b/src/backend/executor/execGrouping.c index 7bc5e405bcc..e361143094c 100644 --- a/src/backend/executor/execGrouping.c +++ b/src/backend/executor/execGrouping.c @@ -382,12 +382,9 @@ FindTupleHashEntry(TupleHashTable hashtable, TupleTableSlot *slot, /* * Compute the hash value for a tuple * - * The passed-in key is a pointer to TupleHashEntryData. In an actual hash - * table entry, the firstTuple field points to a tuple (in MinimalTuple - * format). LookupTupleHashEntry sets up a dummy TupleHashEntryData with a - * NULL firstTuple field --- that cues us to look at the inputslot instead. - * This convention avoids the need to materialize virtual input tuples unless - * they actually need to get copied into the table. + * If tuple is NULL, use the input slot instead. This convention avoids the + * need to materialize virtual input tuples unless they actually need to get + * copied into the table. * * Also, the caller must select an appropriate memory context for running * the hash functions. (dynahash.c doesn't change CurrentMemoryContext.) @@ -455,8 +452,6 @@ TupleHashTableHash(struct tuplehash_hash *tb, const MinimalTuple tuple) /* * See whether two tuples (presumably of the same hash value) match - * - * As above, the passed pointers are pointers to TupleHashEntryData. */ static int TupleHashTableMatch(struct tuplehash_hash *tb, const MinimalTuple tuple1, const MinimalTuple tuple2) |