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Fix RelationIdGetRelation calls that weren't bothering with error checks.

Some of these are quite old, but that doesn't make them not bugs.We'd rather report a failure via elog than SIGSEGV.While at it, uniformly spell the error check as !RelationIsValid(rel)rather than a bare rel == NULL test. The machine code is the samebut it seems better to be consistent.Coverity complained about this today, not sure why, because themistake is in fact old.

1 parente6af7b3 commit2403e54Copy full SHA for 2403e54

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src/backend/replication/logical
- reorderbuffer.c

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`‎src/backend/replication/logical/reorderbuffer.c‎`

Lines changed: 6 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -1553,7 +1553,7 @@ ReorderBufferCommit(ReorderBuffer *rb, TransactionId xid,`
`1553`	`1553`
`1554`	`1554`	`relation=RelationIdGetRelation(reloid);`
`1555`	`1555`
`1556`		`-if (relation==NULL)`
	`1556`	`+if (!RelationIsValid(relation))`
`1557`	`1557`	`elog(ERROR,"could not open relation with OID %u (for filenode \"%s\")",`
`1558`	`1558`	`reloid,`
`1559`	`1559`	`relpathperm(change->data.tp.relnode,`
`@@ -1671,7 +1671,7 @@ ReorderBufferCommit(ReorderBuffer *rb, TransactionId xid,`
`1671`	`1671`
`1672`	`1672`	`relation=RelationIdGetRelation(relid);`
`1673`	`1673`
`1674`		`-if (relation==NULL)`
	`1674`	`+if (!RelationIsValid(relation))`
`1675`	`1675`	`elog(ERROR,"could not open relation with OID %u",relid);`
`1676`	`1676`
`1677`	`1677`	`if (!RelationIsLogicallyLogged(relation))`
`@@ -3031,6 +3031,10 @@ ReorderBufferToastReplace(ReorderBuffer rb, ReorderBufferTXN txn,`
`3031`	`3031`	`desc=RelationGetDescr(relation);`
`3032`	`3032`
`3033`	`3033`	`toast_rel=RelationIdGetRelation(relation->rd_rel->reltoastrelid);`
	`3034`	`+if (!RelationIsValid(toast_rel))`
	`3035`	`+elog(ERROR,"could not open relation with OID %u",`
	`3036`	`+relation->rd_rel->reltoastrelid);`
	`3037`	`+`
`3034`	`3038`	`toast_desc=RelationGetDescr(toast_rel);`
`3035`	`3039`
`3036`	`3040`	`/* should we allocate from stack instead? */`

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Commit2403e54

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`‎src/backend/replication/logical/reorderbuffer.c‎`

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