pgsql: Create a selectivity estimation function for the text search @@

Log Message:
-----------
Create a selectivity estimation function for the text search @@ operator.

Jan Urbanski

Modified Files:
--------------
pgsql/doc/src/sgml:
catalogs.sgml (r2.174 -> r2.175)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/catalogs.sgml?r1=2.174&r2=2.175)
pgsql/src/backend/tsearch:
Makefile (r1.7 -> r1.8)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/tsearch/Makefile?r1=1.7&r2=1.8)
ts_typanalyze.c (r1.1 -> r1.2)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/tsearch/ts_typanalyze.c?r1=1.1&r2=1.2)
pgsql/src/include/catalog:
catversion.h (r1.486 -> r1.487)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h?r1=1.486&r2=1.487)
pg_operator.h (r1.162 -> r1.163)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_operator.h?r1=1.162&r2=1.163)
pg_proc.h (r1.514 -> r1.515)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h?r1=1.514&r2=1.515)
pg_statistic.h (r1.36 -> r1.37)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_statistic.h?r1=1.36&r2=1.37)
pgsql/src/include/tsearch:
ts_type.h (r1.13 -> r1.14)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/tsearch/ts_type.h?r1=1.13&r2=1.14)

Added Files:
-----------
pgsql/src/backend/tsearch:
ts_selfuncs.c (r1.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/tsearch/ts_selfuncs.c?rev=1.1&content-type=text/x-cvsweb-markup)