From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Marc Rechté <marc4(at)rechte(dot)fr> |
Cc: | pgsql-docs(at)postgresql(dot)org |
Subject: | Re: Where is the qualification par in the Query Tree |
Date: | 2020-04-21 14:04:52 |
Message-ID: | 24516.1587477892@sss.pgh.pa.us |
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Lists: | pgsql-docs |
=?UTF-8?Q?Marc_Recht=c3=a9?= <marc4(at)rechte(dot)fr> writes:
> This refers to /doc/src/sgml/html/querytree.html, where one mentions a
> qualification part in the Query Tree. While reading the Query node
> (parsenode.h) and output from the log with debug_print_parse = on, I
> cannot see either this part. Is it gone in profit of join tree ?
As noted near the bottom of that documentation page:
It turns out to be convenient to store the top-level WHERE expression
as a qualification attached to the top-level join-tree item, too. So
really the join tree represents both the FROM and WHERE clauses of a
SELECT.
IOW, Query.jointree->quals.
regards, tom lane
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