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.