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From: Tomas Vondra <tomas.vondra@enterprisedb.com>
To: Noah Misch <noah@leadboat.com>
Cc: Dean Rasheed <dean.a.rasheed@gmail.com>
Cc: Justin Pryzby <pryzby@telsasoft.com>
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Subject: Re: PoC/WIP: Extended statistics on expressions
Date: Sun, 6 Jun 2021 21:13:17 +0200
Message-ID: <4c98203c-8364-bb76-b502-d7b323ba55ba@enterprisedb.com> (raw)
In-Reply-To: <20210606053740.GB297923@rfd.leadboat.com>
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On 6/6/21 7:37 AM, Noah Misch wrote:
> On Sat, Mar 27, 2021 at 01:17:14AM +0100, Tomas Vondra wrote:
>> OK, pushed after a bit more polishing and testing.
> 
> This added a "transformed" field to CreateStatsStmt, but it didn't mention
> that field in src/backend/nodes.  Should those functions handle the field?
> 

Yup, that's a mistake - it should do whatever CREATE INDEX is doing. Not
sure if it can result in error/failure or just inefficiency (due to
transforming the expressions repeatedly), but it should do whatever
CREATE INDEX is doing.

Thanks for noticing! Fixed by d57ecebd12.


regards

-- 
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company





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