Re: [HACKERS] MERGE SQL Statement for PG11

Hi,

sqlsmith triggered an assertion with the following MERGE statement
against the regression database.  Testing was done with master at
039eb6e92f.  Backtrace below.

regards,
Andreas

MERGE INTO public.pagg_tab_ml_p3 as target_0
USING public.hash_i4_heap as ref_0
ON target_0.b = ref_0.seqno
WHEN MATCHED AND ((select bitcol from public.brintest limit 1 offset 92)
	 > cast(null as "bit"))
    and (false)
   THEN UPDATE  set
    b = target_0.b,
    a = target_0.b
WHEN NOT MATCHED
  AND cast(null as text) ~ cast(nullif(case when cast(null as float8) <= cast(null as float8) then cast(null as text) else cast(null as text) end
	,
      cast(null as text)) as text)
THEN DO NOTHING;

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007f25474cf42a in __GI_abort () at abort.c:89
#2  0x0000556c14b75bb3 in ExceptionalCondition (
    conditionName=conditionName@entry=0x556c14d09bf8 "!(list != ((List *) ((void *)0)))", 
    errorType=errorType@entry=0x556c14bc4dbd "FailedAssertion", fileName=fileName@entry=0x556c14d3022c "list.c", 
    lineNumber=lineNumber@entry=390) at assert.c:54
#3  0x0000556c1495d580 in list_nth_cell (list=<optimized out>, n=<optimized out>) at list.c:390
#4  0x0000556c1495d5d6 in list_nth (list=list@entry=0x0, n=<optimized out>) at list.c:413
#5  0x0000556c14911fa5 in adjust_partition_tlist (tlist=0x0, map=<optimized out>, map=<optimized out>) at execPartition.c:1266
#6  0x0000556c14913049 in ExecInitPartitionInfo (mtstate=mtstate@entry=0x556c16c163e8, resultRelInfo=<optimized out>, 
    proute=proute@entry=0x556c16c29988, estate=estate@entry=0x556c16c15bf8, partidx=0) at execPartition.c:683
#7  0x0000556c1490ff80 in ExecMergeMatched (junkfilter=0x556c16c15bf8, tupleid=0x7ffe8088a10a, slot=0x556c16c22e20, 
    estate=0x556c16c15bf8, mtstate=0x556c16c163e8) at execMerge.c:205
#8  ExecMerge (mtstate=mtstate@entry=0x556c16c163e8, estate=estate@entry=0x556c16c15bf8, slot=slot@entry=0x556c16c22e20, 
    junkfilter=junkfilter@entry=0x556c16c2b730, resultRelInfo=resultRelInfo@entry=0x556c16c15e48) at execMerge.c:127
#9  0x0000556c14933614 in ExecModifyTable (pstate=0x556c16c163e8) at nodeModifyTable.c:2179
#10 0x0000556c1490c0ca in ExecProcNode (node=0x556c16c163e8) at ../../../src/include/executor/executor.h:239
#11 ExecutePlan (execute_once=<optimized out>, dest=0x556c16c111b8, direction=<optimized out>, numberTuples=0, 
    sendTuples=<optimized out>, operation=CMD_MERGE, use_parallel_mode=<optimized out>, planstate=0x556c16c163e8, 
    estate=0x556c16c15bf8) at execMain.c:1729
#12 standard_ExecutorRun (queryDesc=0x556c16c1bce8, direction=<optimized out>, count=0, execute_once=<optimized out>)
    at execMain.c:364
#13 0x0000556c14a6ba52 in ProcessQuery (plan=<optimized out>, 
    sourceText=0x556c16b2ac08 "...", params=0x0, 
    queryEnv=0x0, dest=0x556c16c111b8, completionTag=0x7ffe8088a500 "") at pquery.c:161
#14 0x0000556c14a6bceb in PortalRunMulti (portal=portal@entry=0x556c16b96468, isTopLevel=isTopLevel@entry=true, 
    setHoldSnapshot=setHoldSnapshot@entry=false, dest=dest@entry=0x556c16c111b8, altdest=altdest@entry=0x556c16c111b8, 
    completionTag=completionTag@entry=0x7ffe8088a500 "") at pquery.c:1291
#15 0x0000556c14a6c979 in PortalRun (portal=portal@entry=0x556c16b96468, count=count@entry=9223372036854775807, 
    isTopLevel=isTopLevel@entry=true, run_once=run_once@entry=true, dest=dest@entry=0x556c16c111b8, 
    altdest=altdest@entry=0x556c16c111b8, completionTag=0x7ffe8088a500 "") at pquery.c:804
#16 0x0000556c14a6859b in exec_simple_query (
    query_string=0x556c16b2ac08 "MERGE INTO public.pagg_tab_ml_p3 as target_0\nUSING public.hash_i4_heap as ref_0\nON target_0.b = ref_0.seqno\nWHEN MATCHED AND ((select bitcol from public.brintest limit 1 offset 92)\n > cast(null as \"bi"...) at postgres.c:1121
#17 0x0000556c14a6a341 in PostgresMain (argc=<optimized out>, argv=argv@entry=0x556c16b56ad8, dbname=<optimized out>, 
    username=<optimized out>) at postgres.c:4149
#18 0x0000556c1474eac4 in BackendRun (port=0x556c16b4c030) at postmaster.c:4409
#19 BackendStartup (port=0x556c16b4c030) at postmaster.c:4081
#20 ServerLoop () at postmaster.c:1754
#21 0x0000556c149ec017 in PostmasterMain (argc=3, argv=0x556c16b257d0) at postmaster.c:1362
#22 0x0000556c1475006d in main (argc=3, argv=0x556c16b257d0) at main.c:228