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Commit8c61160

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Guard against table-AM-less relations in planner.
The executor will dump core if it's asked to execute a seqscan ona relation having no table AM, such as a view. While that shouldn'treally happen, it's possible to get there via catalog corruption,such as a missing ON SELECT rule. It seems worth installing a defenseagainst that. There are multiple plausible places for such a defense,but I picked the planner's get_relation_info().Per discussion of bug #17646 from Kui Liu. Back-patch to v12 wherethe tableam APIs were introduced; in older versions you won't get aSIGSEGV, so it seems less pressing.Discussion:https://postgr.es/m/17646-70c93cfa40365776@postgresql.org
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‎src/backend/optimizer/util/plancat.c‎

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@@ -125,6 +125,22 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
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*/
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relation=table_open(relationObjectId,NoLock);
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/*
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* Relations without a table AM can be used in a query only if they are of
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* special-cased relkinds. This check prevents us from crashing later if,
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* for example, a view's ON SELECT rule has gone missing. Note that
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* table_open() already rejected indexes and composite types.
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*/
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if (!relation->rd_tableam)
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{
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if (!(relation->rd_rel->relkind==RELKIND_FOREIGN_TABLE||
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relation->rd_rel->relkind==RELKIND_PARTITIONED_TABLE))
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ereport(ERROR,
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(errcode(ERRCODE_WRONG_OBJECT_TYPE),
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errmsg("cannot open relation \"%s\"",
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RelationGetRelationName(relation))));
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}
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/* Temporary and unlogged relations are inaccessible during recovery. */
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if (!RelationIsPermanent(relation)&&RecoveryInProgress())
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ereport(ERROR,

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