Major cleanup of SPI chapter
Major cleanup of SPI chapter

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