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Fix usage of "tableoid" in GENERATED expressions.

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We consider this supported (though I've got my doubts that it's a
good idea, because tableoid is not immutable).  However, several
code paths failed to fill the field in soon enough, causing such
a GENERATED expression to see zero or the wrong value.  This
occurred when ALTER TABLE adds a new GENERATED column to a table
with existing rows, and during regular INSERT or UPDATE on a
foreign table with GENERATED columns.

Noted during investigation of a report from Vitaly Ustinov.
Back-patch to v12 where GENERATED came in.

Discussion: https://postgr.es/m/CAM_DEiWR2DPT6U4xb-Ehigozzd3n3G37ZB1+867zbsEVtYoJww@mail.gmail.com
This commit is contained in:
Tom Lane
2021-05-21 15:02:07 -04:00
parent d18ee6f92d
commit 77e3204ecb
4 changed files with 38 additions and 17 deletions
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13
src/backend/commands/tablecmds.c
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@ -5373,6 +5373,14 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap, LOCKMODE lockmode)
foreach(lc, dropped_attrs)
newslot->tts_isnull[lfirst_int(lc)] = true;
/*
* Constraints and GENERATED expressions might reference the
* tableoid column, so fill tts_tableOid with the desired
* value. (We must do this each time, because it gets
* overwritten with newrel's OID during storing.)
*/
newslot->tts_tableOid = RelationGetRelid(oldrel);
/*
* Process supplied expressions to replace selected columns.
*
@ -5416,11 +5424,6 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap, LOCKMODE lockmode)
&newslot->tts_isnull[ex->attnum - 1]);
}
/*
* Constraints might reference the tableoid column, so
* initialize t_tableOid before evaluating them.
*/
newslot->tts_tableOid = RelationGetRelid(oldrel);
insertslot = newslot;
}
else