LIMIT problem

From: silly sad <sad(at)bankir(dot)ru>
To: pgsql-sql <pgsql-sql(at)postgresql(dot)org>
Subject: LIMIT problem
Date: 2010-04-30 12:50:18
Message-ID: 4BDAD20A.1090503@bankir.ru
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suppose i request

SELECT foo(t.x) FROM t LIMIT 1;

Whither it DEFINED how many times foo() will be executed?

May anyone rely on it?
Or we have to avoid this non SQLish trick?

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