On Wed, Nov 30, 2011 at 5:10 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> The result of parse analysis for that query is a stored date constant
> (in a Const node) with a cast-to-text on top of it.  The system is aware
> that cast-date-to-text isn't immutable, so it doesn't try to fold the
> cast operation.  When you execute the query, it displays the date
> constant using the now-current datestyle.

Another thought: why does it execute the type input function (which is
dependent on a GUC), but not the cast?

Regards,
    Jeff Davis

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