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INDEX ONLY scan with expression index - Mailing list pgsql-general

From James Sewell
Subject INDEX ONLY scan with expression index
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Msg-id CANkGpBtsnNGoXjd69f2WevRxzs_X6Ynzt-OpD9z07ei9GekcyQ@mail.gmail.com
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Responses Re: INDEX ONLY scan with expression index  (Tom Lane <tgl@sss.pgh.pa.us>)
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Hello,

Would anyone be able to shed some light on why expression based indexes can't be used for an index only scan?

I've found a few comments saying this is the case, and I've proven it is the case in reality - but I can't seem to find the why.

Cheers,


James Sewell,
Solutions Architect
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Level 2, 50 Queen St, Melbourne VIC 3000

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