Re: Searching GIN-index (FTS) and sort by timestamp-column

From: Tom Lane
Subject: Re: Searching GIN-index (FTS) and sort by timestamp-column
Date: ,
Msg-id: 27201.1458135447@sss.pgh.pa.us
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In response to: Searching GIN-index (FTS) and sort by timestamp-column  (Andreas Joseph Krogh)
Responses: Re: Searching GIN-index (FTS) and sort by timestamp-column  (Andreas Joseph Krogh)
Re: Searching GIN-index (FTS) and sort by timestamp-column  (Evgeniy Shishkin)
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Searching GIN-index (FTS) and sort by timestamp-column  (Andreas Joseph Krogh, )
 Re: Searching GIN-index (FTS) and sort by timestamp-column  (Tom Lane, )
  Re: Searching GIN-index (FTS) and sort by timestamp-column  (Andreas Joseph Krogh, )
   Re: Searching GIN-index (FTS) and sort by timestamp-column  (Andreas Joseph Krogh, )
   Re: Searching GIN-index (FTS) and sort by timestamp-column  (Jeff Janes, )
    Re: Searching GIN-index (FTS) and sort by timestamp-column  (Andreas Joseph Krogh, )
     Re: Searching GIN-index (FTS) and sort by timestamp-column  (Oleg Bartunov, )
      Re: Searching GIN-index (FTS) and sort by timestamp-column  (Andreas Joseph Krogh, )
    Re: Searching GIN-index (FTS) and sort by timestamp-column  (Oleg Bartunov, )
     Re: Searching GIN-index (FTS) and sort by timestamp-column  (Jeff Janes, )
  Re: Searching GIN-index (FTS) and sort by timestamp-column  (Evgeniy Shishkin, )
   Re: Searching GIN-index (FTS) and sort by timestamp-column  (Evgeniy Shishkin, )
    Re: Searching GIN-index (FTS) and sort by timestamp-column  (Evgeniy Shishkin, )
     Re: Searching GIN-index (FTS) and sort by timestamp-column  (Andreas Joseph Krogh, )
     Re: Searching GIN-index (FTS) and sort by timestamp-column  (Tom Lane, )
      Re: Searching GIN-index (FTS) and sort by timestamp-column  (Andreas Joseph Krogh, )
       Re: Searching GIN-index (FTS) and sort by timestamp-column  (Tom Lane, )
    Re: Searching GIN-index (FTS) and sort by timestamp-column  (Andreas Joseph Krogh, )

Andreas Joseph Krogh <> writes:
> 1. Why isnt' folder_id part of the index-cond?

Because a GIN index is useless for sorting.

> 2. Is there a way to make it use the (same) index to sort by
> received_timestamp?

No.

> 3. Using a GIN-index, is there a way to use the index at all for sorting?

No.

> 4. It doesn't seem like ts_rank uses the index for sorting either.

Same reason.

            regards, tom lane



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From: Andreas Joseph Krogh
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Subject: Re: Searching GIN-index (FTS) and sort by timestamp-column
From: "Doiron, Daniel"
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Subject: Nested Loop vs Hash Join based on predicate?