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Reject change of output-column collation in CREATE OR REPLACE VIEW.

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checkViewTupleDesc() didn't get the memo that it should verify
same attcollation along with same type/typmod.  (A quick scan
did not find other similar oversights.)

Per bug #17404 from Pierre-Aurélien Georges.  On another day
I might've back-patched this, but today I'm feeling paranoid
about unnecessary behavioral changes in back branches.

Discussion: https://postgr.es/m/17404-8a4a270ef30a6709@postgresql.org
This commit is contained in:
Tom Lane
2022-02-15 12:57:44 -05:00
parent 4d373e0528
commit 2523928b28
3 changed files with 56 additions and 23 deletions
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20
src/backend/commands/view.c
View File

@ -282,7 +282,12 @@ checkViewTupleDesc(TupleDesc newdesc, TupleDesc olddesc)
NameStr(oldattr->attname),
NameStr(newattr->attname)),
errhint("Use ALTER VIEW ... RENAME COLUMN ... to change name of view column instead.")));
/* XXX would it be safe to allow atttypmod to change? Not sure */
/*
* We cannot allow type, typmod, or collation to change, since these
* properties may be embedded in Vars of other views/rules referencing
* this one. Other column attributes can be ignored.
*/
if (newattr->atttypid != oldattr->atttypid ||
newattr->atttypmod != oldattr->atttypmod)
ereport(ERROR,
@ -293,7 +298,18 @@ checkViewTupleDesc(TupleDesc newdesc, TupleDesc olddesc)
oldattr->atttypmod),
format_type_with_typemod(newattr->atttypid,
newattr->atttypmod))));
/* We can ignore the remaining attributes of an attribute... */
/*
* At this point, attcollations should be both valid or both invalid,
* so applying get_collation_name unconditionally should be fine.
*/
if (newattr->attcollation != oldattr->attcollation)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("cannot change collation of view column \"%s\" from \"%s\" to \"%s\"",
NameStr(oldattr->attname),
get_collation_name(oldattr->attcollation),
get_collation_name(newattr->attcollation))));
}
/*