pgsql: Add missing optimizer hooks for function cost and number of rows. - Mailing list pgsql-committers

Log Message:
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Add missing optimizer hooks for function cost and number of rows.
Closely follow design of other optimizer hooks: if hook exists
retrieve value from plugin; if still not set then get from cache.

Modified Files:
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    pgsql/src/backend/utils/cache:
        lsyscache.c (r1.168 -> r1.169)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/cache/lsyscache.c?r1=1.168&r2=1.169)
    pgsql/src/include/utils:
        lsyscache.h (r1.131 -> r1.132)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/lsyscache.h?r1=1.131&r2=1.132)