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From: Tom Lane <[email protected]>
To: Siraj G <[email protected]>
Cc: Adrian Klaver <[email protected]>
Cc: [email protected]
Subject: Re: Need assistance in converting subqueries to joins
Date: Fri, 20 Sep 2024 00:48:05 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAC5iy63y60Q8xucNEAQNRekJooCbrT_eiEzZp+UwjchG3Q50Tg@mail.gmail.com>
References: <CAC5iy60YRzqRSyC=hAZneURdCTAsRPH313jJzK9gF6-nkvwGPA@mail.gmail.com>
	<[email protected]>
	<CAC5iy63y60Q8xucNEAQNRekJooCbrT_eiEzZp+UwjchG3Q50Tg@mail.gmail.com>

Siraj G <[email protected]> writes:
> Please find below the query in the format and its execution plan:

[ blink... ]  I'm not sure what you are using there, but it is
*not* Postgres.  There are assorted entries in the execution
plan that community Postgres has never heard of, such as

> -> Remove duplicate (P0, IS_SEC_FILT) rows using temporary table
> (weedout)  (cost=2085.53 rows=1988) (actual time=0.321..22600.652
> rows=10298 loops=1)

> -> Single-row index lookup on P0 using IS_PROJ_PK
> (IS_PROJ_GUID=T0.IS_PROJ_GUID, IS_REPOSITORY_ID=R0.REP_ID)  (cost=0.63
> rows=1) (actual time=0.000..0.000 rows=1 loops=50)

Maybe this is RDS, or Aurora, or Greenplum, or one of many other
commercial forks of Postgres?  In any case you'd get more on-point
advice from their support forums than from the PG community.
It looks like this is a fork that has installed its own underlying
table engine, meaning that what we know about performance may not
be terribly relevant.

			regards, tom lane

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