E.184.1. 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.188.

E.184.2. Changes

• Improve handling of getaddrinfo() on AIX (Tom)

  This fixes a problem with starting the statistics collector, among other things.

• Fix "failed to re-find parent key" errors in VACUUM (Tom)

• Fix bugs affecting multi-gigabyte hash indexes (Tom)

• Fix error when constructing an ARRAY[] made up of multiple empty elements (Tom)

• 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.