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Rewrite interval_hash() so that the hashcodes are equal for values that

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interval_eq() considers equal.  I'm not sure how that fundamental requirement
escaped us through multiple revisions of this hash function, but there it is;
it's been wrong since interval_hash was first written for PG 7.1.
Per bug #4748 from Roman Kononov.

Backpatch to all supported releases.

This patch changes the contents of hash indexes for interval columns.  That's
no particular problem for PG 8.4, since we've broken on-disk compatibility
of hash indexes already; but it will require a migration warning note in
the next minor releases of all existing branches: "if you have any hash
indexes on columns of type interval, REINDEX them after updating".
This commit is contained in:
Tom Lane
2009-04-04 04:53:25 +00:00
parent 1c855f01ea
commit 1c2d408c01
3 changed files with 49 additions and 37 deletions
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4
src/test/regress/sql/interval.sql
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@@ -241,3 +241,7 @@ SET IntervalStyle to postgres_verbose;
select interval '-10 mons -3 days +03:55:06.70';
select interval '1 year 2 mons 3 days 04:05:06.699999';
select interval '0:0:0.7', interval '@ 0.70 secs', interval '0.7 seconds';
-- check that '30 days' equals '1 month' according to the hash function
select '30 days'::interval = '1 month'::interval as t;
select interval_hash('30 days'::interval) = interval_hash('1 month'::interval) as t;