From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Re: equal operator for _int4 (array of int4) |
Date: | 2000-12-21 18:09:38 |
Message-ID: | 18548.977422178@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> writes:
> What will happens if we ignore NULLs ?
Same thing that happens with hash:
regression=# create table foo (f1 int);
CREATE
regression=# create index fooi on foo using hash (f1);
CREATE
regression=# insert into foo values(1);
INSERT 292677 1
regression=# insert into foo values(null);
INSERT 292678 1
regression=# vacuum foo;
NOTICE: Index fooi: NUMBER OF INDEX' TUPLES (1) IS NOT THE SAME AS HEAP' (2).
Recreate the index.
VACUUM
> We need to provide vacuum some information about numbers of NULL values.
Preferably without hardwiring assumptions about the behavior of
different index types into VACUUM.
That cross-check in VACUUM has really caused way more grief than it's
worth. I'm beginning to wonder if we should just take it out...
regards, tom lane
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