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Complain politely about access temp/unlogged tables during recovery.

This has never been supported, but we previously let md.c issue thecomplaint for us at whatever point we tried to examine the backing file.Now we print a nicer error message.Per bug #6041, reported by Emanuel, and extensive discussion with TomLane over where to put the check.

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src/backend/optimizer/util
- plancat.c

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`‎src/backend/optimizer/util/plancat.c`

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Original file line number	Diff line number	Diff line change
`@@ -90,6 +90,12 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,`
`90`	`90`	`*/`
`91`	`91`	`relation=heap_open(relationObjectId,NoLock);`
`92`	`92`
	`93`	`+/* Temporary and unlogged relations are inaccessible during recovery. */`
	`94`	`+if (!RelationNeedsWAL(relation)&&RecoveryInProgress())`
	`95`	`+ereport(ERROR,`
	`96`	`+(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),`
	`97`	`+errmsg("cannot access temporary or unlogged relations during recovery")));`
	`98`	`+`
`93`	`99`	`rel->min_attr=FirstLowInvalidHeapAttributeNumber+1;`
`94`	`100`	`rel->max_attr=RelationGetNumberOfAttributes(relation);`
`95`	`101`	`rel->reltablespace=RelationGetForm(relation)->reltablespace;`

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Commit16925c1

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`‎src/backend/optimizer/util/plancat.c`

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