Expose qurey ID in pg_stat_statements view.

Fujii Masao <fujii@postgresql.org>

Commit: 91484409bdd17f330d10671d388b72d4ef1451d7
Author: Fujii Masao <fujii@postgresql.org>
Date: 2013-12-07T17:06:02Z
Releases: 9.4.0
Expose qurey ID in pg_stat_statements view.

The query ID is the internal hash identifier of the statement,
and was not available in pg_stat_statements view so far.

Daniel Farina, Sameer Thakur and Peter Geoghegan, reviewed by me.

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