Log Message:
-----------
At the head of wchareq, length of (multibyte) character is compared by
using pg_mblen. Therefore, pg_mblen is executed many times, and it
becomes a bottleneck.
This patch makes a short cut, and reduces execution frequency of
pg_mblen by comparing the first byte first.
a_ogawa
Modified Files:
--------------
pgsql/src/backend/utils/adt:
like.c (r1.59 -> r1.60)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/like.c.diff?r1=1.59&r2=1.60)
---------------------------(end of broadcast)---------------------------
TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
