From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Kristofer Munn <kmunn(at)munn(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Indexes on Arrays |
Date: | 2000-09-06 05:02:06 |
Message-ID: | 12616.968216526@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Kristofer Munn <kmunn(at)munn(dot)com> writes:
> I have a table with an array like so:
> create table foo (
> id int4,
> names varchar(80)[]
> );
> and would like to place an index on name[1].
Right now the only way is to make a function that extracts names[1]
and create a functional index on yourfunction(names).
Although functional indexes are a perfectly good general solution from
an academic point of view, this is still a pain in the neck :-(.
Also kinda slow, unless you code the function in C.
I recall talking to someone who was going to look at supporting more
general expressions for index values, but nothing's come of the idea
so far.
regards, tom lane
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