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Forbid renaming columns of objects whose column names are system-generated.

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KaiGai Kohei, with adjustments to the comments.
This commit is contained in:
Robert Haas 2010-03-20 00:43:42 +00:00
parent a836abe9f6
commit acdd6ea5ab
1 changed files with 19 additions and 1 deletions
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20
src/backend/commands/tablecmds.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.328 2010/03/10 19:48:39 rhaas Exp $ * $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.329 2010/03/20 00:43:42 rhaas Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -1943,6 +1943,7 @@ renameatt(Oid myrelid,
HeapTuple atttup; HeapTuple atttup;
Form_pg_attribute attform; Form_pg_attribute attform;
int attnum; int attnum;
char relkind;
/* /*
* Grab an exclusive lock on the target table, which we will NOT release * Grab an exclusive lock on the target table, which we will NOT release
@ -1955,6 +1956,23 @@ renameatt(Oid myrelid,
(errcode(ERRCODE_WRONG_OBJECT_TYPE), (errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot rename column of typed table"))); errmsg("cannot rename column of typed table")));
/*
* Renaming the columns of sequences or toast tables doesn't actually
* break anything from the system's point of view, since internal
* references are by attnum. But it doesn't seem right to allow users
* to change names that are hardcoded into the system, hence the following
* restriction.
*/
relkind = RelationGetForm(targetrelation)->relkind;
if (relkind != RELKIND_RELATION &&
relkind != RELKIND_VIEW &&
relkind != RELKIND_COMPOSITE_TYPE &&
relkind != RELKIND_INDEX)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("\"%s\" is not a table, view, composite type or index",
RelationGetRelationName(targetrelation))));
/* /*
* permissions checking. only the owner of a class can change its schema. * permissions checking. only the owner of a class can change its schema.
*/ */