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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Justin Pryzby <pryzby@telsasoft.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: ALTER TABLE .. ALTER COLUMN .. ERROR: attribute .. has wrong type
Date: Tue, 03 Jan 2017 15:28:33 -0500
Message-ID: <30893.1483475313@sss.pgh.pa.us> (raw)
In-Reply-To: <30539.1483474695@sss.pgh.pa.us>
References: <20161012152505.GD12747@telsasoft.com>
	<20170102225618.GA10071@telsasoft.com>
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	<CA+TgmoY9W99m3cW9-4Kjnw4KO+PRqF8Lh_AqWh8Qoop9ZhnUdw@mail.gmail.com>
	<20170103165903.GP32031@telsasoft.com>
	<CA+TgmobAT992nxV=6kqnpF=LK493oNdf2dzXJX-Yz+=LWZ-_AA@mail.gmail.com>
	<20170103185742.GQ32031@telsasoft.com>
	<28476.1483471956@sss.pgh.pa.us>
	<20170103194604.GR32031@telsasoft.com>
	<29101.1483473021@sss.pgh.pa.us>
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	<30539.1483474695@sss.pgh.pa.us>
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I wrote:
> I'm wondering if this represents some sort of out-of-sync condition
> between the table and its child tables.

Hah:

regression=# create table p(f1 int);
CREATE TABLE
regression=# create table c1(extra smallint) inherits(p);
CREATE TABLE
regression=# alter table p add column f2 int;
ALTER TABLE
regression=# insert into c1 values(1,2,3);
INSERT 0 1
regression=# alter table p alter column f2 type bigint using f2::bigint;
ERROR:  attribute 2 has wrong type
DETAIL:  Table has type smallint, but query expects integer.

Of course, in c1 the target column is #3 not #2.  The USING expression
isn't being adjusted for the discrepancy between parent and child column
numbers.

This test case works before 9.5; somebody must have broke it while
refactoring.

			regards, tom lane


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