From: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi> |
---|---|
To: | Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Improve new hash partition bound check error messages |
Date: | 2021-02-02 12:26:33 |
Message-ID: | 9fc7eb48-0e8f-0836-8def-bc4b242e9c63@iki.fi |
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Thread: | |
Lists: | pgsql-hackers |
On 02/02/2021 12:35, Peter Eisentraut wrote:
> I had a bit of trouble parsing the error message "every hash partition
> modulus must be a factor of the next larger modulus", so I went into the
> code, added some comments and added errdetail messages for each case. I
> think it's a bit clearer now.
Yeah, that error message is hard to understand. This is an improvement,
but it still took me a while to understand it.
Let's look at the example in the regression test:
-- check partition bound syntax for the hash partition
CREATE TABLE hash_parted (
a int
) PARTITION BY HASH (a);
CREATE TABLE hpart_1 PARTITION OF hash_parted FOR VALUES WITH (MODULUS
10, REMAINDER 0);
CREATE TABLE hpart_2 PARTITION OF hash_parted FOR VALUES WITH (MODULUS
50, REMAINDER 1);
CREATE TABLE hpart_3 PARTITION OF hash_parted FOR VALUES WITH (MODULUS
200, REMAINDER 2);
With this patch, you get this:
CREATE TABLE fail_part PARTITION OF hash_parted FOR VALUES WITH (MODULUS
25, REMAINDER 3);
ERROR: every hash partition modulus must be a factor of the next larger
modulus
DETAIL: The existing modulus 10 is not a factor of the new modulus 25.
CREATE TABLE fail_part PARTITION OF hash_parted FOR VALUES WITH (MODULUS
150, REMAINDER 3);
ERROR: every hash partition modulus must be a factor of the next larger
modulus
DETAIL: The new modulus 150 is not factor of the existing modulus 200.
How about this?
CREATE TABLE fail_part PARTITION OF hash_parted FOR VALUES WITH (MODULUS
25, REMAINDER 3);
ERROR: every hash partition modulus must be a factor of the next larger
modulus
DETAIL: 25 is not divisible by 10, the modulus of existing partition
"hpart_1"
CREATE TABLE fail_part PARTITION OF hash_parted FOR VALUES WITH (MODULUS
150, REMAINDER 3);
ERROR: every hash partition modulus must be a factor of the next larger
modulus
DETAIL: 150 is not a factor of 200, the modulus of existing partition
"hpart_3"
Calling the existing partition by name seems good. And this phrasing
puts the focus on the new modulus in both variants; presumably the
existing partition is OK and the problem is in the new definition.
- Heikki
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