Обсуждение: pgsql: Teach pattern_fixed_prefix() about collations.

Teach pattern_fixed_prefix() about collations.

This is necessary, not optional, now that ILIKE and regexes are collation
aware --- else we might derive a wrong comparison constant for index
optimized pattern matches.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/3c381a55b0fa1c4ca328211e39df8e1a715129cb

Modified Files
--------------
src/backend/optimizer/path/indxpath.c |   34 +++++----
src/backend/utils/adt/selfuncs.c      |  137 +++++++++++++++++++++++----------
src/include/utils/selfuncs.h          |    1 +
3 files changed, 117 insertions(+), 55 deletions(-)