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Add a 64-bit hash function for type hstore.

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There's some question about the correctness of the hash function, but
if it's wrong, the 32-bit version is also wrong.

Amul Sul, reviewed by Hironobu Suzuki

Discussion: https://postgr.es/m/CAAJ_b947JjnNr9Cp45iNjSqKf6PA5mCTmKsRwPjows93YwQrmw@mail.gmail.com
This commit is contained in:
Tom Lane
2018-11-23 13:37:34 -05:00
parent 48c41fa974
commit eb6f29141b
6 changed files with 64 additions and 5 deletions
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12
contrib/hstore/expected/hstore.out
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@@ -1515,3 +1515,15 @@ select json_agg(q) from (select f1, hstore_to_json_loose(f2) as f2 from test_jso
{"f1":"rec2","f2":{"b": false, "c": "null", "d": -12345, "e": "012345.6", "f": -1.234, "g": 0.345e-4, "a key": 2}}]
(1 row)
-- Check the hstore_hash() and hstore_hash_extended() function explicitly.
SELECT v as value, hstore_hash(v)::bit(32) as standard,
hstore_hash_extended(v, 0)::bit(32) as extended0,
hstore_hash_extended(v, 1)::bit(32) as extended1
FROM (VALUES (NULL::hstore), (''), ('"a key" =>1'), ('c => null'),
('e => 012345'), ('g => 2.345e+4')) x(v)
WHERE hstore_hash(v)::bit(32) != hstore_hash_extended(v, 0)::bit(32)
OR hstore_hash(v)::bit(32) = hstore_hash_extended(v, 1)::bit(32);
value | standard | extended0 | extended1
-------+----------+-----------+-----------
(0 rows)