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Re: Missing information on Expressional Indexes

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: David Fetter <david(at)fetter(dot)org>
Cc: PostgreSQL Docs <pgsql-docs(at)postgresql(dot)org>
Subject: Re: Missing information on Expressional Indexes
Date: 2010-03-17 04:47:51
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Lists: pgsql-docs
David Fetter <david(at)fetter(dot)org> writes:
> I think this page should mention that the expressions used in an
> expressional index need to be equivalent to an IMMUTABLE function, and
> the docs don't say so.

Sure they do, see CREATE INDEX:

	All functions and operators used in an index definition must be
	"immutable" ...

			regards, tom lane

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