Tweak OpernameGetCandidates() to reduce palloc overhead --- profiling showed that for common operator names such as '=', the pallocs done by this routine occupied a surprisingly large fraction of the total time for the parser to process an operator.
Tweak OpernameGetCandidates() to reduce palloc overhead --- profiling
showed that for common operator names such as '=', the pallocs done by
this routine occupied a surprisingly large fraction of the total time
for the parser to process an operator.

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