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When converting a table to a view, remove its system columns.

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Views should not have any pg_attribute entries for system columns.
However, we forgot to remove such entries when converting a table to a
view.  This could lead to crashes later on, if someone attempted to
reference such a column, as reported by Kohei KaiGai.

Patch in HEAD only.  This bug has been there forever, but in the back
branches we will have to defend against existing mis-converted views,
so it doesn't seem worthwhile to change the conversion code too.
This commit is contained in:
Tom Lane
2012-10-24 13:39:37 -04:00
parent f4c4335a4a
commit a4e8680a6c
5 changed files with 88 additions and 2 deletions
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11
src/backend/rewrite/rewriteDefine.c
View File

@ -18,6 +18,7 @@
#include "access/htup_details.h"
#include "catalog/catalog.h"
#include "catalog/dependency.h"
#include "catalog/heap.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "catalog/objectaccess.h"
@ -510,13 +511,19 @@ DefineQueryRewrite(char *rulename,
}
/*
* IF the relation is becoming a view, delete the storage files associated
* with it. NB: we had better have AccessExclusiveLock to do this ...
* If the relation is becoming a view, delete the storage files associated
* with it. Also, get rid of any system attribute entries in pg_attribute,
* because a view shouldn't have any of those.
*
* NB: we had better have AccessExclusiveLock to do this ...
*
* XXX what about getting rid of its TOAST table? For now, we don't.
*/
if (RelisBecomingView)
{
RelationDropStorage(event_relation);
DeleteSystemAttributeTuples(event_relid);
}
/* Close rel, but keep lock till commit... */
heap_close(event_relation, NoLock);