Is it an expected behavior?
postgres=# CREATE TABLE t1 (a int, b int);
CREATE TABLE
postgres=# CREATE TABLE t2 (b int, c int);
CREATE TABLE
postgres=# CREATE TABLE t3 (d int) inherits (t1, t2);
NOTICE: merging multiple inherited definitions of column "b"
CREATE TABLE
The t3.d is inherited from t1 and t2. Its attinhcount is 2.
postgres=# ALTER TABLE t1 RENAME b TO x;
ALTER TABLE
It alters name of the column 'b' in the t1 and its child tables ('t3').
postgres=# SELECT * FROM t1;
a | x
---+---
(0 rows)
postgres=# SELECT * FROM t2;
ERROR: could not find inherited attribute "b" of relation "t3"
Because t3.b is also inherited from the t2, but ALTER TABLE does not
care about multiple inherited columns well.
I think we should not allow to rename a column with attinhcount > 1.
Any comments?
Thanks,
--
OSS Platform Development Division, NEC
KaiGai Kohei <[email protected]>
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