pgsql: Minor refactor of nodeAgg.c. - Mailing list pgsql-committers

Minor refactor of nodeAgg.c.

  * Separate calculation of hash value from the lookup.
  * Split build_hash_table() into two functions.
  * Change lookup_hash_entry() to return AggStatePerGroup. That's all
    the caller needed, anyway.

These changes are to support the upcoming Disk-based Hash Aggregation
work.

Discussion: https://postgr.es/m/31f5ab871a3ad5a1a91a7a797651f20e77ac7ce3.camel%40j-davis.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/5b618e1f48aecc66e3a9f60289491da520faae19

Modified Files
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src/backend/executor/nodeAgg.c | 140 ++++++++++++++++++++++++++---------------
1 file changed, 89 insertions(+), 51 deletions(-)