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From: Tom Lane <[email protected]>
To: Tomas Vondra <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: postgres_fdw: using TABLESAMPLE to collect remote sample
Date: Fri, 11 Feb 2022 12:39:43 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Tomas Vondra <[email protected]> writes:
> So here we go. The patch does a very simple thing - it uses TABLESAMPLE 
> to collect/transfer just a small sample from the remote node, saving 
> both CPU and network.

This is great if the remote end has TABLESAMPLE, but pre-9.5 servers
don't, and postgres_fdw is supposed to still work with old servers.
So you need some conditionality for that.

			regards, tom lane

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