1) skip hot-chain procssing for k2 index build scan
2) skip toast declaration when generating bki file
3) disable RelationMapInitializePhase2 in RelationCacheInitializePhase2 for k2pg mode
4) move K2PgInitPostgresBackend before t_thrd.proc_cxt.PostInit->InitBackendWorker() so that k2pg gate is initialized before the PG initialization
1) skip hot-chain procssing for k2 index build scan 2) skip toast declaration when generating bki file 3) disable RelationMapInitializePhase2 in RelationCacheInitializePhase2 for k2pg mode 4) move K2PgInitPostgresBackend before t_thrd.proc_cxt.PostInit->InitBackendWorker() so that k2pg gate is initialized before the PG initialization