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Fix buggy logic in isTempNamespaceInUse()

The logic introduced in this routine as of246a6c8 would report anincorrect result when a session calls it to check if the temporarynamespace owned by the session is in use or not. It is possible tooptimize more the routine in this case to avoid a PGPROC lookup, butlet's keep the logic simple. As this routine is used only by autovacuumfor now, there were no live bugs, still let's be correct for any futurecode involving it.Author: Michael PaquierReviewed-by: Julien RouhaudDiscussion:https://postgr.es/m/20200113093703.GA41902@paquier.xyzBackpatch-through: 11

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src/backend/catalog
- namespace.c

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`‎src/backend/catalog/namespace.c`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -3233,8 +3233,8 @@ isTempNamespaceInUse(Oid namespaceId)`
`3233`	`3233`
`3234`	`3234`	`backendId=GetTempNamespaceBackendId(namespaceId);`
`3235`	`3235`
`3236`		`-if (backendId==InvalidBackendId\|\|`
`3237`		`-backendId==MyBackendId)`
	`3236`	`+/* No such temporary namespace? */`
	`3237`	`+if (backendId==InvalidBackendId)`
`3238`	`3238`	`return false;`
`3239`	`3239`
`3240`	`3240`	`/* Is the backend alive? */`

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Commit5ec7bd8

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`‎src/backend/catalog/namespace.c`

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