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From: Andy Fan <[email protected]>
To: Richard Guo <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Cc: [email protected]
Subject: Re: Eager aggregation, take 3
Date: Mon, 04 Mar 2024 19:45:43 +0800
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAMbWs48jzLrPt1J_00ZcPZXWUQKawQOFE8ROc-ADiYqsqrpBNw@mail.gmail.com>
References: <CAMbWs48jzLrPt1J_00ZcPZXWUQKawQOFE8ROc-ADiYqsqrpBNw@mail.gmail.com>


Richard Guo <[email protected]> writes:

> Hi All,
>
> Eager aggregation is a query optimization technique that partially
> pushes a group-by past a join, and finalizes it once all the relations
> are joined.  Eager aggregation reduces the number of input rows to the
> join and thus may result in a better overall plan.  This technique is
> thoroughly described in the 'Eager Aggregation and Lazy Aggregation'
> paper [1].

This is a really helpful and not easy task, even I am not sure when I
can spend time to study this, I want to say "Thanks for working on
this!" first and hope we can really progress on this topic. Good luck! 

-- 
Best Regards
Andy Fan

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