Log Message:
-----------
Add comment for multi-byte computation.
Modified Files:
--------------
pgsql/src/backend/parser:
parse_expr.c (r1.182 -> r1.183)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_expr.c.diff?r1=1.182&r2=1.183)