BUG #17762: date field casts to null in case section with join's

From: PG Bug reporting form <noreply(at)postgresql(dot)org>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Cc: jounts(at)gmail(dot)com
Subject: BUG #17762: date field casts to null in case section with join's
Date: 2023-01-27 12:21:11
Message-ID: 17762-1a82488048c89e3c@postgresql.org
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The following bug has been logged on the website:

Bug reference: 17762
Logged by: Evgeny Nee
Email address: jounts(at)gmail(dot)com
PostgreSQL version: 15.1
Operating system: debian 11
Description:

Query works fine:
SELECT id,
CASE
WHEN date_field IS NOT NULL THEN date_field::TEXT
END AS date_str
FROM my_table

But this query:
SELECT t1id, t2.name,
CASE
WHEN t1.date_field IS NOT NULL THEN t1.date_field::TEXT
END AS date_str
FROM my_table t1
JOIN my_table2 t2 ON t1.id = t2.id

returns: null in date_str

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