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Re: Indexes on Expressions -- Parentheses

From: Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com>
To: "Thomas F(dot)O'Connell" <tfo(at)sitening(dot)com>
Cc: General <pgsql-general(at)postgresql(dot)org>
Subject: Re: Indexes on Expressions -- Parentheses
Date: 2004-09-29 05:30:55
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Lists: pgsql-docspgsql-general

On Tue, 28 Sep 2004, Thomas F.O'Connell wrote:

>  From 11.5 in the docs:
> "The syntax of the CREATE INDEX command normally requires writing
> parentheses around index expressions, as shown in the second example.
> The parentheses may be omitted when the expression is just a function
> call, as in the first example."
> But when I try this:
> db=# CREATE INDEX expression_idx on some_table( extract( year from
> some_column ) );

Extract(year from some_column) is not really just a function call it's
an expression that looks similar to a function call because that's how SQL
defined it.

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