Log Message:
-----------
Fix core dump with a large SQL.
Modified Files:
--------------
pgpool-II/parser:
pool_memory.c (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgpool/pgpool-II/parser/pool_memory.c.diff?r1=1.7&r2=1.8)