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| author | Robert Haas <rhaas@postgresql.org> | 2020-02-24 17:17:08 +0530 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2020-02-24 17:17:43 +0530 |
| commit | 07b95c3d8334f737d4717c91967729f7721e785c (patch) | |
| tree | 2abfb24ba5536bb20b0ceb9eae54eeb1b1b7bf91 /src/backend/nodes/bitmapset.c | |
| parent | bf883b211eae18662f2dfaede02f5d115bf0b805 (diff) | |
| download | postgresql-07b95c3d8334f737d4717c91967729f7721e785c.tar.gz postgresql-07b95c3d8334f737d4717c91967729f7721e785c.zip | |
Move bitmap_hash and bitmap_match to bitmapset.c.
The closely-related function bms_hash_value is already defined in that
file, and this change means that hashfn.c no longer needs to depend on
nodes/bitmapset.h. That gets us closer to allowing use of the hash
functions in hashfn.c in frontend code.
Patch by me, reviewed by Suraj Kharage and Mark Dilger.
Discussion: http://postgr.es/m/CA+TgmoaRiG4TXND8QuM6JXFRkM_1wL2ZNhzaUKsuec9-4yrkgw@mail.gmail.com
Diffstat (limited to 'src/backend/nodes/bitmapset.c')
| -rw-r--r-- | src/backend/nodes/bitmapset.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/backend/nodes/bitmapset.c b/src/backend/nodes/bitmapset.c index 648cc1a7eb3..f711e6c6995 100644 --- a/src/backend/nodes/bitmapset.c +++ b/src/backend/nodes/bitmapset.c @@ -1167,3 +1167,26 @@ bms_hash_value(const Bitmapset *a) return DatumGetUInt32(hash_any((const unsigned char *) a->words, (lastword + 1) * sizeof(bitmapword))); } + +/* + * bitmap_hash - hash function for keys that are (pointers to) Bitmapsets + * + * Note: don't forget to specify bitmap_match as the match function! + */ +uint32 +bitmap_hash(const void *key, Size keysize) +{ + Assert(keysize == sizeof(Bitmapset *)); + return bms_hash_value(*((const Bitmapset *const *) key)); +} + +/* + * bitmap_match - match function to use with bitmap_hash + */ +int +bitmap_match(const void *key1, const void *key2, Size keysize) +{ + Assert(keysize == sizeof(Bitmapset *)); + return !bms_equal(*((const Bitmapset *const *) key1), + *((const Bitmapset *const *) key2)); +} |