| From: | Jeff Davis <jdavis(at)postgresql(dot)org> |
|---|---|
| To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
| Subject: | pgsql: Introduce TupleHashTableHash() and LookupTupleHashEntryHash(). |
| Date: | 2020-02-07 04:44:35 |
| Message-ID: | E1izvVL-0008Bd-N2@gemulon.postgresql.org |
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| Thread: | |
| Lists: | pgsql-committers |
Introduce TupleHashTableHash() and LookupTupleHashEntryHash().
Expose two new entry points: one for only calculating the hash value
of a tuple, and another for looking up a hash entry when the hash
value is already known. This will be useful for disk-based Hash
Aggregation to avoid recomputing the hash value for the same tuple
after saving and restoring it from disk.
Discussion: https://postgr.es/m/37091115219dd522fd9ed67333ee8ed1b7e09443.camel%40j-davis.com
Branch
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master
Details
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https://git.postgresql.org/pg/commitdiff/4eaea3db150af56aa2e40efe91997fd25f3b6d73
Modified Files
--------------
src/backend/executor/execGrouping.c | 108 ++++++++++++++++++++++++++----------
src/include/executor/executor.h | 5 ++
2 files changed, 83 insertions(+), 30 deletions(-)
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