| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Peter Haworth" <pmh(at)edison(dot)ioppublishing(dot)com> |
| Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: How to setup default value "0000-00-00" for "date" |
| Date: | 2004-08-20 17:51:55 |
| Message-ID: | 898.1093024315@sss.pgh.pa.us |
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| Lists: | pgsql-general |
"Peter Haworth" <pmh(at)edison(dot)ioppublishing(dot)com> writes:
> ... why couldn't an explicit IS NULL test
> be allowed to use the index?
It could, if someone cared to puzzle out a way to integrate IS NULL into
the index opclass and access method API infrastructure. Right now all
that stuff assumes that indexable operators are, well, operators (and I
think there are places that assume they must be binary operators, to
boot).
I've looked at this once or twice but always decided that the
bang-for-the-buck ratio was too low compared to other open problems ...
regards, tom lane
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