pgsql: DROP ...

Log Message:
-----------

DROP ... IF EXISTS for the following cases:
language, tablespace, trigger, rule, opclass, function, aggregate. operator, and cast.

Modified Files:
--------------
pgsql/src/backend/commands:
aggregatecmds.c (r1.34 -> r1.35)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/aggregatecmds.c.diff?r1=1.34&r2=1.35)
functioncmds.c (r1.74 -> r1.75)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/functioncmds.c.diff?r1=1.74&r2=1.75)
opclasscmds.c (r1.45 -> r1.46)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/opclasscmds.c.diff?r1=1.45&r2=1.46)
operatorcmds.c (r1.30 -> r1.31)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/operatorcmds.c.diff?r1=1.30&r2=1.31)
proclang.c (r1.64 -> r1.65)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/proclang.c.diff?r1=1.64&r2=1.65)
tablespace.c (r1.34 -> r1.35)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablespace.c.diff?r1=1.34&r2=1.35)
trigger.c (r1.202 -> r1.203)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/trigger.c.diff?r1=1.202&r2=1.203)
pgsql/src/backend/nodes:
copyfuncs.c (r1.335 -> r1.336)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c.diff?r1=1.335&r2=1.336)
equalfuncs.c (r1.271 -> r1.272)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/equalfuncs.c.diff?r1=1.271&r2=1.272)
pgsql/src/backend/parser:
gram.y (r2.545 -> r2.546)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.545&r2=2.546)
pgsql/src/backend/rewrite:
rewriteRemove.c (r1.64 -> r1.65)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/rewrite/rewriteRemove.c.diff?r1=1.64&r2=1.65)
pgsql/src/backend/tcop:
utility.c (r1.257 -> r1.258)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/utility.c.diff?r1=1.257&r2=1.258)
pgsql/src/include/commands:
trigger.h (r1.57 -> r1.58)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/trigger.h.diff?r1=1.57&r2=1.58)
pgsql/src/include/nodes:
parsenodes.h (r1.310 -> r1.311)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/parsenodes.h.diff?r1=1.310&r2=1.311)
pgsql/src/include/rewrite:
rewriteRemove.h (r1.21 -> r1.22)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/rewrite/rewriteRemove.h.diff?r1=1.21&r2=1.22)