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Summary: YB Seq Scan code path is not hit because Foreign Scan is the default and pg hint plan does not work. Upcoming merge with YB master will bring in master commit 465ee2c which changes the default to YB Seq Scan. To test YB Seq Scan, a temporary patch is needed (see the test plan). With that, two bugs are encountered: fix them. 1. FailedAssertion("TTS_IS_VIRTUAL(slot)" On simple test case create table t (i int primary key, j int); select * from t; get TRAP: FailedAssertion("TTS_IS_VIRTUAL(slot)", File: "../../../../../../../src/postgres/src/backend/access/yb_access/yb_scan.c", Line: 3473, PID: 2774450) Details: #0 0x00007fd52616eacf in raise () from /lib64/libc.so.6 #1 0x00007fd526141ea5 in abort () from /lib64/libc.so.6 #2 0x0000000000af33ad in ExceptionalCondition (conditionName=conditionName@entry=0xc2938d "TTS_IS_VIRTUAL(slot)", errorType=errorType@entry=0xc01498 "FailedAssertion", fileName=fileName@entry=0xc28f18 "../../../../../../../src/postgres/src/backend/access/yb_access/yb_scan.c", lineNumber=lineNumber@entry=3473) at ../../../../../../../src/postgres/src/backend/utils/error/assert.c:69 #3 0x00000000005c26bd in ybFetchNext (handle=0x2600ffc43680, slot=slot@entry=0x2600ff6c2980, relid=16384) at ../../../../../../../src/postgres/src/backend/access/yb_access/yb_scan.c:3473 #4 0x00000000007de444 in YbSeqNext (node=0x2600ff6c2778) at ../../../../../../src/postgres/src/backend/executor/nodeYbSeqscan.c:156 #5 0x000000000078b3c6 in ExecScanFetch (node=node@entry=0x2600ff6c2778, accessMtd=accessMtd@entry=0x7de2b9 <YbSeqNext>, recheckMtd=recheckMtd@entry=0x7de26e <YbSeqRecheck>) at ../../../../../../src/postgres/src/backend/executor/execScan.c:133 #6 0x000000000078b44e in ExecScan (node=0x2600ff6c2778, accessMtd=accessMtd@entry=0x7de2b9 <YbSeqNext>, recheckMtd=recheckMtd@entry=0x7de26e <YbSeqRecheck>) at ../../../../../../src/postgres/src/backend/executor/execScan.c:182 #7 0x00000000007de298 in ExecYbSeqScan (pstate=<optimized out>) at ../../../../../../src/postgres/src/backend/executor/nodeYbSeqscan.c:191 #8 0x00000000007871ef in ExecProcNodeFirst (node=0x2600ff6c2778) at ../../../../../../src/postgres/src/backend/executor/execProcnode.c:480 #9 0x000000000077db0e in ExecProcNode (node=0x2600ff6c2778) at ../../../../../../src/postgres/src/include/executor/executor.h:285 #10 ExecutePlan (execute_once=<optimized out>, dest=0x2600ff6b1a10, direction=<optimized out>, numberTuples=0, sendTuples=true, operation=CMD_SELECT, use_parallel_mode=<optimized out>, planstate=0x2600ff6c2778, estate=0x2600ff6c2128) at ../../../../../../src/postgres/src/backend/executor/execMain.c:1650 #11 standard_ExecutorRun (queryDesc=0x2600ff675128, direction=<optimized out>, count=0, execute_once=<optimized out>) at ../../../../../../src/postgres/src/backend/executor/execMain.c:367 #12 0x000000000077dbfe in ExecutorRun (queryDesc=queryDesc@entry=0x2600ff675128, direction=direction@entry=ForwardScanDirection, count=count@entry=0, execute_once=<optimized out>) at ../../../../../../src/postgres/src/backend/executor/execMain.c:308 #13 0x0000000000982617 in PortalRunSelect (portal=portal@entry=0x2600ff90e128, forward=forward@entry=true, count=0, count@entry=9223372036854775807, dest=dest@entry=0x2600ff6b1a10) at ../../../../../../src/postgres/src/backend/tcop/pquery.c:954 #14 0x000000000098433c in PortalRun (portal=portal@entry=0x2600ff90e128, count=count@entry=9223372036854775807, isTopLevel=isTopLevel@entry=true, run_once=run_once@entry=true, dest=dest@entry=0x2600ff6b1a10, altdest=altdest@entry=0x2600ff6b1a10, qc=0x7fffc14a13c0) at ../../../../../../src/postgres/src/backend/tcop/pquery.c:786 #15 0x000000000097e65b in exec_simple_query (query_string=0x2600ffdc6128 "select * from t;") at ../../../../../../src/postgres/src/backend/tcop/postgres.c:1321 #16 yb_exec_simple_query_impl (query_string=query_string@entry=0x2600ffdc6128) at ../../../../../../src/postgres/src/backend/tcop/postgres.c:5060 #17 0x000000000097b7a5 in yb_exec_query_wrapper_one_attempt (exec_context=exec_context@entry=0x2600ffdc6000, restart_data=restart_data@entry=0x7fffc14a1640, functor=functor@entry=0x97e033 <yb_exec_simple_query_impl>, functor_context=functor_context@entry=0x2600ffdc6128, attempt=attempt@entry=0, retry=retry@entry=0x7fffc14a15ff) at ../../../../../../src/postgres/src/backend/tcop/postgres.c:5028 #18 0x000000000097d077 in yb_exec_query_wrapper (exec_context=exec_context@entry=0x2600ffdc6000, restart_data=restart_data@entry=0x7fffc14a1640, functor=functor@entry=0x97e033 <yb_exec_simple_query_impl>, functor_context=functor_context@entry=0x2600ffdc6128) at ../../../../../../src/postgres/src/backend/tcop/postgres.c:5052 #19 0x000000000097d0ca in yb_exec_simple_query (query_string=query_string@entry=0x2600ffdc6128 "select * from t;", exec_context=exec_context@entry=0x2600ffdc6000) at ../../../../../../src/postgres/src/backend/tcop/postgres.c:5075 #20 0x000000000097fe8a in PostgresMain (dbname=<optimized out>, username=<optimized out>) at ../../../../../../src/postgres/src/backend/tcop/postgres.c:5794 #21 0x00000000008c8354 in BackendRun (port=0x2600ff8423c0) at ../../../../../../src/postgres/src/backend/postmaster/postmaster.c:4791 #22 BackendStartup (port=0x2600ff8423c0) at ../../../../../../src/postgres/src/backend/postmaster/postmaster.c:4491 #23 ServerLoop () at ../../../../../../src/postgres/src/backend/postmaster/postmaster.c:1878 #24 0x00000000008caa55 in PostmasterMain (argc=argc@entry=25, argv=argv@entry=0x2600ffdc01a0) at ../../../../../../src/postgres/src/backend/postmaster/postmaster.c:1533 #25 0x0000000000804ba8 in PostgresServerProcessMain (argc=25, argv=0x2600ffdc01a0) at ../../../../../../src/postgres/src/backend/main/main.c:208 #26 0x0000000000804bc8 in main () 3469 ybFetchNext(YBCPgStatement handle, 3470 TupleTableSlot *slot, Oid relid) 3471 { 3472 Assert(slot != NULL); 3473 Assert(TTS_IS_VIRTUAL(slot)); (gdb) p *slot $2 = {type = T_TupleTableSlot, tts_flags = 18, tts_nvalid = 0, tts_ops = 0xeaf5e0 <TTSOpsHeapTuple>, tts_tupleDescriptor = 0x2600ff6416c0, tts_values = 0x2600ff6c2a00, tts_isnull = 0x2600ff6c2a10, tts_mcxt = 0x2600ff6c2000, tts_tid = {ip_blkid = {bi_hi = 0, bi_lo = 0}, ip_posid = 0, yb_item = {ybctid = 0}}, tts_tableOid = 0, tts_yb_insert_oid = 0} Fix by making YB Seq Scan always use virtual slot. This is similar to what is done for YB Foreign Scan. 2. segfault in ending scan Same simple test case gives segfault at a later stage. Details: #0 0x00000000007de762 in table_endscan (scan=0x3debfe3ab88) at ../../../../../../src/postgres/src/include/access/tableam.h:997 #1 ExecEndYbSeqScan (node=node@entry=0x3debfe3a778) at ../../../../../../src/postgres/src/backend/executor/nodeYbSeqscan.c:298 #2 0x0000000000787a75 in ExecEndNode (node=0x3debfe3a778) at ../../../../../../src/postgres/src/backend/executor/execProcnode.c:649 #3 0x000000000077ffaf in ExecEndPlan (estate=0x3debfe3a128, planstate=<optimized out>) at ../../../../../../src/postgres/src/backend/executor/execMain.c:1489 #4 standard_ExecutorEnd (queryDesc=0x2582fdc88928) at ../../../../../../src/postgres/src/backend/executor/execMain.c:503 #5 0x00000000007800f8 in ExecutorEnd (queryDesc=queryDesc@entry=0x2582fdc88928) at ../../../../../../src/postgres/src/backend/executor/execMain.c:474 #6 0x00000000006f140c in PortalCleanup (portal=0x2582ff900128) at ../../../../../../src/postgres/src/backend/commands/portalcmds.c:305 #7 0x0000000000b3c36a in PortalDrop (portal=portal@entry=0x2582ff900128, isTopCommit=isTopCommit@entry=false) at ../../../../../../../src/postgres/src/backend/utils/mmgr/portalmem.c:514 #8 0x000000000097e667 in exec_simple_query (query_string=0x2582ffdc6128 "select * from t;") at ../../../../../../src/postgres/src/backend/tcop/postgres.c:1331 #9 yb_exec_simple_query_impl (query_string=query_string@entry=0x2582ffdc6128) at ../../../../../../src/postgres/src/backend/tcop/postgres.c:5060 #10 0x000000000097b79a in yb_exec_query_wrapper_one_attempt (exec_context=exec_context@entry=0x2582ffdc6000, restart_data=restart_data@entry=0x7ffc81c0e7d0, functor=functor@entry=0x97e028 <yb_exec_simple_query_impl>, functor_context=functor_context@entry=0x2582ffdc6128, attempt=attempt@entry=0, retry=retry@entry=0x7ffc81c0e78f) at ../../../../../../src/postgres/src/backend/tcop/postgres.c:5028 #11 0x000000000097d06c in yb_exec_query_wrapper (exec_context=exec_context@entry=0x2582ffdc6000, restart_data=restart_data@entry=0x7ffc81c0e7d0, functor=functor@entry=0x97e028 <yb_exec_simple_query_impl>, functor_context=functor_context@entry=0x2582ffdc6128) at ../../../../../../src/postgres/src/backend/tcop/postgres.c:5052 #12 0x000000000097d0bf in yb_exec_simple_query (query_string=query_string@entry=0x2582ffdc6128 "select * from t;", exec_context=exec_context@entry=0x2582ffdc6000) at ../../../../../../src/postgres/src/backend/tcop/postgres.c:5075 #13 0x000000000097fe7f in PostgresMain (dbname=<optimized out>, username=<optimized out>) at ../../../../../../src/postgres/src/backend/tcop/postgres.c:5794 #14 0x00000000008c8349 in BackendRun (port=0x2582ff8403c0) at ../../../../../../src/postgres/src/backend/postmaster/postmaster.c:4791 #15 BackendStartup (port=0x2582ff8403c0) at ../../../../../../src/postgres/src/backend/postmaster/postmaster.c:4491 #16 ServerLoop () at ../../../../../../src/postgres/src/backend/postmaster/postmaster.c:1878 #17 0x00000000008caa4a in PostmasterMain (argc=argc@entry=25, argv=argv@entry=0x2582ffdc01a0) at ../../../../../../src/postgres/src/backend/postmaster/postmaster.c:1533 #18 0x0000000000804b9d in PostgresServerProcessMain (argc=25, argv=0x2582ffdc01a0) at ../../../../../../src/postgres/src/backend/main/main.c:208 #19 0x0000000000804bbd in main () 294 /* 295 * close heap scan 296 */ 297 if (tsdesc != NULL) 298 table_endscan(tsdesc); Reason is initial merge 55782d5 incorrectly merges end of ExecEndYbSeqScan. Upstream PG 9ddef36278a9f676c07d0b4d9f33fa22e48ce3b5 removes code, but initial merge duplicates lines. Remove those lines. Test Plan: Apply the following patch to activate YB Seq Scan: diff --git a/src/postgres/src/backend/optimizer/path/allpaths.c b/src/postgres/src/backend/optimizer/path/allpaths.c index 8a4c38a965..854d84a648 100644 --- a/src/postgres/src/backend/optimizer/path/allpaths.c +++ b/src/postgres/src/backend/optimizer/path/allpaths.c @@ -576,7 +576,7 @@ set_rel_pathlist(PlannerInfo *root, RelOptInfo *rel, else { /* Plain relation */ - if (IsYBRelationById(rte->relid)) + if (false) { /* * Using a foreign scan which will use the YB FDW by On almalinux 8, ./yb_build.sh fastdebug --gcc11 pg15_tests/run_all_tests.sh fastdebug --gcc11 --sj --sp --scb fails the following tests: - test_D29546 - test_pg15_regress: yb_pg15 - test_types_geo: yb_pg_box - test_hash_in_queries: yb_hash_in_queries Manually check to see that they are due to YB Seq Scan explain output differences. Reviewers: aagrawal, tfoucher Reviewed By: tfoucher Subscribers: yql Differential Revision: https://phorge.dev.yugabyte.com/D31139
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