Clarity in partial index example.

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Subject: Clarity in partial index example.
Date: 2019-04-03 20:20:08
Message-ID: 155432280882.722.12392985690846288230@wrigleys.postgresql.org
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The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/11/indexes-partial.html
Description:

The example illustrating when a partial index can and cannot be used is a
little misleading. The query which can use the partial index is:
SELECT *
FROM access_log
WHERE url = '/index.html' AND client_ip = inet '212.78.10.32';

and the query which can't use the partial index is:
SELECT *
FROM access_log
WHERE client_ip = inet '192.168.100.23';

Maybe I am misunderstanding the concept here but url = '/index.html' doesn't
have any effect on this? If that's the case I would suggest either removing
it from the first query or adding it to the second query.

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