patch: format function, next generation

Pavel Stehule <pavel.stehule@gmail.com>

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From: Pavel Stehule <pavel.stehule@gmail.com>

To: PostgreSQL Hackers <pgsql-hackers@postgresql.org>

Cc: Robert Haas <robertmhaas@gmail.com>, Takahiro Itagaki <itagaki.takahiro@gmail.com>

Date: 2010-10-22T08:48:17Z

Lists: pgsql-hackers

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format.diff (text/x-patch) patch

Hello

I reworked a implementation of format function. This respects last discussion:

* support a positional placeholders - syntax %99$x,
* support a tags: %s, I, L,
* enhanced documentation,
* enhanced reggress tests

Regards

Pavel Stehule