From: | PG Bug reporting form <noreply(at)postgresql(dot)org> |
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To: | pgsql-bugs(at)lists(dot)postgresql(dot)org |
Cc: | klaxian(at)gmail(dot)com |
Subject: | BUG #15208: COALESCE with CTE returns NULL |
Date: | 2018-05-25 16:17:18 |
Message-ID: | 152726503844.26748.4906459255150532845@wrigleys.postgresql.org |
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Lists: | pgsql-bugs |
The following bug has been logged on the website:
Bug reference: 15208
Logged by: Rick Gabriel
Email address: klaxian(at)gmail(dot)com
PostgreSQL version: 10.4
Operating system: Ubuntu Linux 16.04
Description:
When using COALESCE with an aggregate subquery to a CTE, NULL is returned
instead of the first non-null value in the argument list. Proof-of-concept
examples are below. I would expect COALESCE to return 0 in these cases. Am I
missing something? Thanks.
WITH test_cte AS (SELECT 1 AS id, 2 AS qty)
SELECT COALESCE(SUM(qty), 0) FROM test_cte WHERE id=2;
WITH test_cte AS (SELECT 1 AS id, 2 AS qty)
SELECT COALESCE((SELECT SUM(qty) FROM test_cte WHERE id=2), 0);
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Next Message | Sergei Kornilov | 2018-05-25 16:24:42 | Re: BUG #15208: COALESCE with CTE returns NULL |
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