Mark new text<->date, text<->time, text<->timetz conversion functions as noncachable, so that CURRENT_DATE and CURRENT_TIME work as functions again, rather than being collapsed to constants immediately.  Marking the reverse conversions noncachable might be overkill, but I'm not sure; do these datatypes have the notion of a CURRENT value?  Better safe than sorry, for now.
Mark new text<->date, text<->time, text<->timetz conversion functions as
noncachable, so that CURRENT_DATE and CURRENT_TIME work as functions
again, rather than being collapsed to constants immediately.  Marking the
reverse conversions noncachable might be overkill, but I'm not sure;
do these datatypes have the notion of a CURRENT value?  Better safe than
sorry, for now.

zaksoup/gpdb,ovr/postgres-xl,rubikloud/gpdb,lintzc/gpdb,lpetrov-pivotal/gpdb,tangp3/gpdb,cjcjameson/gpdb,snaga/postgres-xl,cjcjameson/gpdb,foyzur/gpdb,adam8157/gpdb,0x0FFF/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,rubikloud/gpdb,snaga/postgres-xl,foyzur/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,lisakowen/gpdb,pavanvd/postgres-xl,Chibin/gpdb,kmjungersen/PostgresXL,foyzur/gpdb,xuegang/gpdb,rvs/gpdb,50wu/gpdb,yuanzhao/gpdb,Quikling/gpdb,adam8157/gpdb,jmcatamney/gpdb,rvs/gpdb,royc1/gpdb,edespino/gpdb,xinzweb/gpdb,lintzc/gpdb,adam8157/gpdb,lintzc/gpdb,rubikloud/gpdb,randomtask1155/gpdb,yuanzhao/gpdb,randomtask1155/gpdb,Chibin/gpdb,cjcjameson/gpdb,lintzc/gpdb,CraigHarris/gpdb,Quikling/gpdb,ahachete/gpdb,chrishajas/gpdb,CraigHarris/gpdb,yuanzhao/gpdb,edespino/gpdb,yuanzhao/gpdb,rvs/gpdb,kaknikhil/gpdb,Quikling/gpdb,oberstet/postgres-xl,Chibin/gpdb,arcivanov/postgres-xl,kmjungersen/PostgresXL,xinzweb/gpdb,cjcjameson/gpdb,jmcatamney/gpdb,Postgres-XL/Postgres-XL,snaga/postgres-xl,ashwinstar/gpdb,randomtask1155/gpdb,atris/gpdb,greenplum-db/gpdb,chrishajas/gpdb,kmjungersen/PostgresXL,lintzc/gpdb,xuegang/gpdb,janebeckman/gpdb,xinzweb/gpdb,kaknikhil/gpdb,chrishajas/gpdb,randomtask1155/gpdb,xuegang/gpdb,kaknikhil/gpdb,edespino/gpdb,CraigHarris/gpdb,lisakowen/gpdb,atris/gpdb,yazun/postgres-xl,pavanvd/postgres-xl,tangp3/gpdb,rubikloud/gpdb,Postgres-XL/Postgres-XL,ashwinstar/gpdb,edespino/gpdb,ahachete/gpdb,zaksoup/gpdb,kaknikhil/gpdb,lisakowen/gpdb,atris/gpdb,royc1/gpdb,edespino/gpdb,50wu/gpdb,lpetrov-pivotal/gpdb,CraigHarris/gpdb,postmind-net/postgres-xl,Quikling/gpdb,lpetrov-pivotal/gpdb,zeroae/postgres-xl,ahachete/gpdb,oberstet/postgres-xl,adam8157/gpdb,adam8157/gpdb,lpetrov-pivotal/gpdb,randomtask1155/gpdb,adam8157/gpdb,cjcjameson/gpdb,Postgres-XL/Postgres-XL,ahachete/gpdb,atris/gpdb,50wu/gpdb,rvs/gpdb,xinzweb/gpdb,oberstet/postgres-xl,tangp3/gpdb,lisakowen/gpdb,jmcatamney/gpdb,ahachete/gpdb,kaknikhil/gpdb,edespino/gpdb,rubikloud/gpdb,janebeckman/gpdb,Quikling/gpdb,greenplum-db/gpdb,chrishajas/gpdb,greenplum-db/gpdb,CraigHarris/gpdb,randomtask1155/gpdb,techdragon/Postgres-XL,arcivanov/postgres-xl,CraigHarris/gpdb,pavanvd/postgres-xl,Chibin/gpdb,chrishajas/gpdb,royc1/gpdb,lisakowen/gpdb,Chibin/gpdb,chrishajas/gpdb,adam8157/gpdb,Chibin/gpdb,ashwinstar/gpdb,50wu/gpdb,Chibin/gpdb,techdragon/Postgres-XL,royc1/gpdb,ovr/postgres-xl,Postgres-XL/Postgres-XL,50wu/gpdb,lisakowen/gpdb,ashwinstar/gpdb,rvs/gpdb,0x0FFF/gpdb,lintzc/gpdb,Quikling/gpdb,0x0FFF/gpdb,pavanvd/postgres-xl,lintzc/gpdb,0x0FFF/gpdb,0x0FFF/gpdb,edespino/gpdb,postmind-net/postgres-xl,ahachete/gpdb,tpostgres-projects/tPostgres,CraigHarris/gpdb,foyzur/gpdb,arcivanov/postgres-xl,royc1/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,Quikling/gpdb,edespino/gpdb,adam8157/gpdb,zeroae/postgres-xl,janebeckman/gpdb,yuanzhao/gpdb,janebeckman/gpdb,edespino/gpdb,rubikloud/gpdb,yazun/postgres-xl,zaksoup/gpdb,xuegang/gpdb,Chibin/gpdb,yazun/postgres-xl,greenplum-db/gpdb,tpostgres-projects/tPostgres,Chibin/gpdb,ahachete/gpdb,xuegang/gpdb,snaga/postgres-xl,xuegang/gpdb,yazun/postgres-xl,zeroae/postgres-xl,atris/gpdb,lpetrov-pivotal/gpdb,zaksoup/gpdb,lpetrov-pivotal/gpdb,rubikloud/gpdb,ashwinstar/gpdb,tangp3/gpdb,foyzur/gpdb,atris/gpdb,royc1/gpdb,techdragon/Postgres-XL,0x0FFF/gpdb,CraigHarris/gpdb,kaknikhil/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,yazun/postgres-xl,50wu/gpdb,chrishajas/gpdb,techdragon/Postgres-XL,zaksoup/gpdb,jmcatamney/gpdb,janebeckman/gpdb,randomtask1155/gpdb,snaga/postgres-xl,kaknikhil/gpdb,zaksoup/gpdb,xinzweb/gpdb,tangp3/gpdb,xuegang/gpdb,janebeckman/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,ovr/postgres-xl,atris/gpdb,zaksoup/gpdb,Quikling/gpdb,cjcjameson/gpdb,postmind-net/postgres-xl,arcivanov/postgres-xl,kmjungersen/PostgresXL,chrishajas/gpdb,kmjungersen/PostgresXL,0x0FFF/gpdb,yuanzhao/gpdb,ahachete/gpdb,50wu/gpdb,janebeckman/gpdb,kaknikhil/gpdb,rvs/gpdb,yuanzhao/gpdb,tpostgres-projects/tPostgres,lisakowen/gpdb,randomtask1155/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,rvs/gpdb,yuanzhao/gpdb,xinzweb/gpdb,lintzc/gpdb,xuegang/gpdb,foyzur/gpdb,xinzweb/gpdb,kaknikhil/gpdb,CraigHarris/gpdb,janebeckman/gpdb,tangp3/gpdb,rvs/gpdb,jmcatamney/gpdb,royc1/gpdb,postmind-net/postgres-xl,oberstet/postgres-xl,lintzc/gpdb,zeroae/postgres-xl,tangp3/gpdb,janebeckman/gpdb,lisakowen/gpdb,zeroae/postgres-xl,foyzur/gpdb,Chibin/gpdb,cjcjameson/gpdb,Quikling/gpdb,rvs/gpdb,xinzweb/gpdb,lpetrov-pivotal/gpdb,Quikling/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,greenplum-db/gpdb,pavanvd/postgres-xl,xuegang/gpdb,janebeckman/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,tpostgres-projects/tPostgres,tangp3/gpdb,edespino/gpdb,Postgres-XL/Postgres-XL,ovr/postgres-xl,tpostgres-projects/tPostgres,foyzur/gpdb,lpetrov-pivotal/gpdb,0x0FFF/gpdb,royc1/gpdb,rvs/gpdb,oberstet/postgres-xl,50wu/gpdb,ovr/postgres-xl,rubikloud/gpdb,postmind-net/postgres-xl,atris/gpdb,zaksoup/gpdb,techdragon/Postgres-XL