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Use newly added InvalidCommandId instead of 0

The symbol was added by71901ab; the original code was introduced by6868ed7. Development of both overlapped which is why we apparentlyfailed to notice.This is a (very slight) behavior change, so I'm not backpatching this to9.4 for now, even though the symbol does exist there.

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src/backend/access/heap
- heapam.c

1 file changed

-3

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`‎src/backend/access/heap/heapam.c`

Lines changed: 3 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -2818,7 +2818,7 @@ heap_delete(Relation relation, ItemPointer tid,`
`2818`	`2818`	`if (result==HeapTupleSelfUpdated)`
`2819`	`2819`	`hufd->cmax=HeapTupleHeaderGetCmax(tp.t_data);`
`2820`	`2820`	`else`
`2821`		`-hufd->cmax=0;/* for lack of anInvalidCommandId value */`
	`2821`	`+hufd->cmax=InvalidCommandId;`
`2822`	`2822`	`UnlockReleaseBuffer(buffer);`
`2823`	`2823`	`if (have_tuple_lock)`
`2824`	`2824`	`UnlockTupleTuplock(relation,&(tp.t_self),LockTupleExclusive);`
`@@ -3415,7 +3415,7 @@ heap_update(Relation relation, ItemPointer otid, HeapTuple newtup,`
`3415`	`3415`	`if (result==HeapTupleSelfUpdated)`
`3416`	`3416`	`hufd->cmax=HeapTupleHeaderGetCmax(oldtup.t_data);`
`3417`	`3417`	`else`
`3418`		`-hufd->cmax=0;/* for lack of anInvalidCommandId value */`
	`3418`	`+hufd->cmax=InvalidCommandId;`
`3419`	`3419`	`UnlockReleaseBuffer(buffer);`
`3420`	`3420`	`if (have_tuple_lock)`
`3421`	`3421`	`UnlockTupleTuplock(relation,&(oldtup.t_self),*lockmode);`
`@@ -4573,7 +4573,7 @@ heap_lock_tuple(Relation relation, HeapTuple tuple,`
`4573`	`4573`	`if (result==HeapTupleSelfUpdated)`
`4574`	`4574`	`hufd->cmax=HeapTupleHeaderGetCmax(tuple->t_data);`
`4575`	`4575`	`else`
`4576`		`-hufd->cmax=0;/* for lack of anInvalidCommandId value */`
	`4576`	`+hufd->cmax=InvalidCommandId;`
`4577`	`4577`	`LockBuffer(*buffer,BUFFER_LOCK_UNLOCK);`
`4578`	`4578`	`if (have_tuple_lock)`
`4579`	`4579`	`UnlockTupleTuplock(relation,tid,mode);`

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Commit6f82295

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`‎src/backend/access/heap/heapam.c`

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