[COMMITTERS] pgsql: Introduce 64-bit hash functions with a 64-bit seed.
| От | Robert Haas |
|---|---|
| Тема | [COMMITTERS] pgsql: Introduce 64-bit hash functions with a 64-bit seed. |
| Дата | |
| Msg-id | E1dnbjt-0004xb-6w@gemulon.postgresql.org обсуждение исходный текст |
| Ответы |
Re: [COMMITTERS] pgsql: Introduce 64-bit hash functions with a 64-bit seed.
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| Список | pgsql-committers |
Introduce 64-bit hash functions with a 64-bit seed. This will be useful for hash partitioning, which needs a way to seed the hash functions to avoid problems such as a hash index on a hash partitioned table clumping all values into a small portion of the bucket space; it's also useful for anything that wants a 64-bit hash value rather than a 32-bit hash value. Just in case somebody wants a 64-bit hash value that is compatible with the existing 32-bit hash values, make the low 32-bits of the 64-bit hash value match the 32-bit hash value when the seed is 0. Robert Haas and Amul Sul Discussion: http://postgr.es/m/CA+Tgmoafx2yoJuhCQQOL5CocEi-w_uG4S2xT0EtgiJnPGcHW3g@mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/81c5e46c490e2426db243eada186995da5bb0ba7 Modified Files -------------- doc/src/sgml/xindex.sgml | 13 +- src/backend/access/hash/hashfunc.c | 372 +++++++++++++++++++++++++++- src/backend/access/hash/hashpage.c | 2 +- src/backend/access/hash/hashutil.c | 6 +- src/backend/access/hash/hashvalidate.c | 42 +++- src/backend/commands/opclasscmds.c | 34 ++- src/backend/utils/adt/acl.c | 15 ++ src/backend/utils/adt/arrayfuncs.c | 79 ++++++ src/backend/utils/adt/date.c | 21 ++ src/backend/utils/adt/jsonb_op.c | 43 ++++ src/backend/utils/adt/jsonb_util.c | 43 ++++ src/backend/utils/adt/mac.c | 9 + src/backend/utils/adt/mac8.c | 9 + src/backend/utils/adt/network.c | 10 + src/backend/utils/adt/numeric.c | 60 +++++ src/backend/utils/adt/pg_lsn.c | 6 + src/backend/utils/adt/rangetypes.c | 63 +++++ src/backend/utils/adt/timestamp.c | 19 ++ src/backend/utils/adt/uuid.c | 8 + src/backend/utils/adt/varchar.c | 18 ++ src/backend/utils/cache/lsyscache.c | 8 +- src/backend/utils/cache/typcache.c | 58 ++++- src/include/access/hash.h | 32 ++- src/include/catalog/catversion.h | 2 +- src/include/catalog/pg_amproc.h | 36 +++ src/include/catalog/pg_proc.h | 54 ++++ src/include/fmgr.h | 1 + src/include/utils/jsonb.h | 2 + src/include/utils/typcache.h | 4 + src/test/regress/expected/alter_generic.out | 4 +- src/test/regress/expected/hash_func.out | 300 ++++++++++++++++++++++ src/test/regress/parallel_schedule | 2 +- src/test/regress/sql/hash_func.sql | 222 +++++++++++++++++ 33 files changed, 1555 insertions(+), 42 deletions(-)
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