Re: Bug in MergeAttributesIntoExisting() function.

>On Monday, 4 January 2016 8:24 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

>Either way, however, the way you declared c2, it has an independent
>local definition of all four columns, and so they should not go away
>even if the parent's columns go away. This is exactly the purpose
>that attislocal was created to serve, and your patch destroys it.

Understood this is not a bug, thank you.

I missed ALTER TABLE statement in previous test case, correct test case is as follow:
-- create table
CREATE TABLE p1 (a int , b int);
CREATE TABLE c2 (a int , b int);

-- alter c2' inheritance
ALTER TABLE c2 INHERIT p1;

-- drop column b
ALTER TABLE p1 DROP COLUMN b;

-- table description

postgres=# \d p1
Table "public.p1"
Column | Type | Modifiers
--------+---------+-----------
a | integer |
Number of child tables: 1 (Use \d+ to list them.)

postgres=# \d c2
Table "public.c2"
Column | Type | Modifiers
--------+---------+-----------
a | integer |
b | integer |
Inherits: p1

Regards,
Amul Sul