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| author | David Rowley <drowley@postgresql.org> | 2023-01-23 17:35:01 +1300 |
|---|---|---|
| committer | David Rowley <drowley@postgresql.org> | 2023-01-23 17:35:01 +1300 |
| commit | 16fd03e956540d1b47b743f6a84f37c54ac93dd4 (patch) | |
| tree | 5d4e04184fcc5e119b92d48529b60bc160f99633 /src/include/utils/array.h | |
| parent | 5a3a95385bd5a8f1a4fd50545b7efe9338581899 (diff) | |
| download | postgresql-16fd03e956540d1b47b743f6a84f37c54ac93dd4.tar.gz postgresql-16fd03e956540d1b47b743f6a84f37c54ac93dd4.zip | |
Allow parallel aggregate on string_agg and array_agg
This adds combine, serial and deserial functions for the array_agg() and
string_agg() aggregate functions, thus allowing these aggregates to
partake in partial aggregations. This allows both parallel aggregation to
take place when these aggregates are present and also allows additional
partition-wise aggregation plan shapes to include plans that require
additional aggregation once the partially aggregated results from the
partitions have been combined.
Author: David Rowley
Reviewed-by: Andres Freund, Tomas Vondra, Stephen Frost, Tom Lane
Discussion: https://postgr.es/m/CAKJS1f9sx_6GTcvd6TMuZnNtCh0VhBzhX6FZqw17TgVFH-ga_A@mail.gmail.com
Diffstat (limited to 'src/include/utils/array.h')
| -rw-r--r-- | src/include/utils/array.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/include/utils/array.h b/src/include/utils/array.h index 1ad074055ae..b13dfb345ef 100644 --- a/src/include/utils/array.h +++ b/src/include/utils/array.h @@ -409,6 +409,9 @@ extern bool array_contains_nulls(ArrayType *array); extern ArrayBuildState *initArrayResult(Oid element_type, MemoryContext rcontext, bool subcontext); +extern ArrayBuildState *initArrayResultWithSize(Oid element_type, + MemoryContext rcontext, + bool subcontext, int initsize); extern ArrayBuildState *accumArrayResult(ArrayBuildState *astate, Datum dvalue, bool disnull, Oid element_type, |