Add support for Case exprs to fix_indxqual_references, so that Case works in WHERE join clauses.  Temporary patch --- this routine is one of many that ought to be changed to use centralized expression-tree- walking logic.
Add support for Case exprs to fix_indxqual_references,
so that Case works in WHERE join clauses.  Temporary patch --- this routine
is one of many that ought to be changed to use centralized expression-tree-
walking logic.

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