BUG #15608: Index is used for an inherit table but not for the table with the index

From: PG Bug reporting form <noreply(at)postgresql(dot)org>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Cc: axel(dot)n(dot)c(dot)andersson(at)gmail(dot)com
Subject: BUG #15608: Index is used for an inherit table but not for the table with the index
Date: 2019-01-28 10:00:39
Message-ID: 15608-16c08671ddd35ac6@postgresql.org
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The following bug has been logged on the website:

Bug reference: 15608
Logged by: Axel Hörteborn
Email address: axel(dot)n(dot)c(dot)andersson(at)gmail(dot)com
PostgreSQL version: 11.1
Operating system: Windows 10 x64
Description:

I tried to ask a question on Stackoverflow but it seems to be a bug:
Hopefully is all the details required in the Stackoverflow question, in
short I have a "table_2017_1" which Inherits "table_2017", so no data or
index are stored directly in "table_2017". When I run a question on
table_2017 it uses the index on table_2017_1 but when I run the exact same
question on "table_2017_1" it doesn't evaluate the index and perform a
sequence scan instead.

https://stackoverflow.com/questions/54362324/postgresql-index-is-used-for-an-inherit-table-but-not-for-the-table-with-the-i

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