Re: pg_dump - wrong order with inheritance

Tom Lane-2 wrote
> FWIW, the reason I'm doubtful of your wrong-dump-order diagnosis is
> that it's pretty hard to see how a not-null violation would arise
> that way.  The subsequent complaints may only be consequences of
> that one.

i've just prepared test case and did some debugging. It turned out that the
issue isn't dump order but wrong ddl generated by pg_dump.

<pre>
CREATE TABLE a00
(
  id   INTEGER NOT NULL,
  name TEXT    NOT NULL,
  CONSTRAINT a00_pkey PRIMARY KEY (id)
)
WITH (
OIDS =FALSE
);

CREATE TABLE a03
(
  id   INTEGER NOT NULL,
  name TEXT    NOT NULL,
  CONSTRAINT a03_pkey PRIMARY KEY (id)
)

WITH (
OIDS =FALSE
);

ALTER TABLE a03
INHERIT a00;

ALTER TABLE a03
ALTER COLUMN name DROP NOT NULL;

</pre>

and now:
pg_dump testdump | psql testdump02

<pre>
COPY 0
ERROR:  null value in column "name" violates not-null constraint
DETAIL:  Failing row contains (1, null).
CONTEXT:  COPY a03, line 1: "1  \N"
</pre>

so pg_dump is trying to create table a03 this way:
<pre>
CREATE TABLE a03 (
    id integer,
    name text
)
INHERITS (a00);
</pre>

and don't takes into account that column name has changed.





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