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PostgreSQL 8.4.22 Documentation
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E.158. Release 7.3.17

Release Date: 2007-01-08

This release contains a variety of fixes from 7.3.16.

E.158.1. Migration to Version 7.3.17

A dump/restore is not required for those running 7.3.X. However, if you are upgrading from a version earlier than 7.3.13, see Section E.162.

E.158.2. Changes

to_number() and to_char(numeric) are now STABLE, not IMMUTABLE, for new initdb installs (Tom)

This is because lc_numeric can potentially change the output of these functions.
Improve index usage of regular expressions that use parentheses (Tom)

This improves psql \d performance also.

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