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Re: PgSQL 15.3: Execution plan not using index as expected - Mailing list pgsql-general

From rob stone
Subject Re: PgSQL 15.3: Execution plan not using index as expected
Date
Msg-id f91820f43eb45bab7e9d93b994a00985d9a28285.camel@tpg.com.au
Whole thread Raw
In response to PgSQL 15.3: Execution plan not using index as expected  (Dürr Software <info@fduerr.de>)
Responses Re: PgSQL 15.3: Execution plan not using index as expected
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Hello,

> ---------------------------------------------------------------------
> -------------------------
>   PostgreSQL 9.3.4 on x86_64-unknown-linux-gnu, compiled by gcc
> (Debian
> 4.8.3-2) 4.8.3, 64-bit
>
>
> ---------------------------------------------------------------------
> ------------------------------------------------
>   PostgreSQL 15.3 (Debian 15.3-1.pgdg120+1) on x86_64-pc-linux-gnu,
> compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit
> (1 Zeile)
>
>
9.3 plan
->  Index Scan using client_session_user_id_idx on client_session

Looks like a collation issue given the difference in compilers used.
In the 9.3 plan the index is used.
Maybe try a reindex of the table.

HTH,
Rob

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