Release 7.4.15
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Release date: 2007-01-08
This release contains a variety of fixes from 7.4.14. For information about new features in the 7.4 major release, see Section E.253 .
E.238.1. Migration to Version 7.4.15
A dump/restore is not required for those running 7.4.X. However, if you are upgrading from a version earlier than 7.4.11, see Section E.242 .
E.238.2. Changes
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    Improve handling of getaddrinfo()on AIX (Tom)This fixes a problem with starting the statistics collector, among other things. 
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    Fix "failed to re-find parent key" errors in VACUUM (Tom) 
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    Fix bugs affecting multi-gigabyte hash indexes (Tom) 
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    Fix error when constructing an ARRAY[] made up of multiple empty elements (Tom) 
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    to_number()andto_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. 
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    Improve index usage of regular expressions that use parentheses (Tom) This improves psql \d performance also.