Re: ALTER TABLE SET ACCESS METHOD on partitioned tables

Hello Alvaro,

21.03.2024 15:07, Alvaro Herrera wrote:
> Given that Michaël is temporarily gone, I propose to push the attached
> tomorrow.

Please look at a new anomaly introduced with 374c7a229.
Starting from that commit, the following erroneous query:
CREATE FOREIGN TABLE fp PARTITION OF pg_am DEFAULT SERVER x;

triggers an assertion failure:
TRAP: failed Assert("relation->rd_rel->relam == InvalidOid"), File: "relcache.c", Line: 1219, PID: 3706301

with the stack trace:
...
#4  0x00007fe53ced67f3 in __GI_abort () at ./stdlib/abort.c:79
#5  0x000055f28555951e in ExceptionalCondition (conditionName=conditionName@entry=0x55f285744788 
"relation->rd_rel->relam == InvalidOid", fileName=fileName@entry=0x55f285743f1c "relcache.c", 
lineNumber=lineNumber@entry=1219)
     at assert.c:66
#6  0x000055f285550450 in RelationBuildDesc (targetRelId=targetRelId@entry=16385, insertIt=insertIt@entry=false) at 
relcache.c:1219
#7  0x000055f285550769 in RelationClearRelation (relation=relation@entry=0x7fe5310dd178, rebuild=rebuild@entry=true) at

relcache.c:2667
#8  0x000055f285550c41 in RelationFlushRelation (relation=0x7fe5310dd178) at relcache.c:2850
#9  0x000055f285550ca0 in RelationCacheInvalidateEntry (relationId=<optimized out>) at relcache.c:2921
#10 0x000055f285542551 in LocalExecuteInvalidationMessage (msg=0x55f2861b3160) at inval.c:738
#11 0x000055f28554159b in ProcessInvalidationMessages (group=0x55f2861b2e6c, func=func@entry=0x55f2855424a8 
<LocalExecuteInvalidationMessage>) at inval.c:518
#12 0x000055f285542740 in CommandEndInvalidationMessages () at inval.c:1180
#13 0x000055f28509cbbd in AtCCI_LocalCache () at xact.c:1550
#14 0x000055f28509e88e in CommandCounterIncrement () at xact.c:1116
#15 0x000055f2851d0c8b in DefineRelation (stmt=stmt@entry=0x55f2861803b0, relkind=relkind@entry=102 'f', ownerId=10, 
ownerId@entry=0, typaddress=typaddress@entry=0x0,
     queryString=queryString@entry=0x55f28617f870 "CREATE FOREIGN TABLE fp PARTITION OF pg_am DEFAULT SERVER x;") at 
tablecmds.c:1008
#16 0x000055f28540945d in ProcessUtilitySlow (pstate=pstate@entry=0x55f2861a9dc0, pstmt=pstmt@entry=0x55f286180510, 
queryString=queryString@entry=0x55f28617f870 "CREATE FOREIGN TABLE fp PARTITION OF pg_am DEFAULT SERVER x;",
     context=context@entry=PROCESS_UTILITY_TOPLEVEL, params=params@entry=0x0, queryEnv=queryEnv@entry=0x0, 
dest=0x55f2861807d0, qc=0x7fff15b5d7c0) at utility.c:1203
#17 0x000055f28540911f in standard_ProcessUtility (pstmt=0x55f286180510, queryString=0x55f28617f870 "CREATE FOREIGN 
TABLE fp PARTITION OF pg_am DEFAULT SERVER x;", readOnlyTree=<optimized out>, context=PROCESS_UTILITY_TOPLEVEL,
     params=0x0, queryEnv=0x0, dest=0x55f2861807d0, qc=0x7fff15b5d7c0) at utility.c:1067
...

On 374c7a229~1 it fails with
ERROR:  "pg_am" is not partitioned

Best regards,
Alexander