Re: BUG #15334: Partition elimination not working as expected when using enum as partition key

From: Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>
To: Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>
Cc: Damir Ciganović-Janković <damir(dot)ciganovic(dot)jankovic(at)gmail(dot)com>, pgsql-bugs(at)lists(dot)postgresql(dot)org
Subject: Re: BUG #15334: Partition elimination not working as expected when using enum as partition key
Date: 2018-08-20 06:06:19
Message-ID: 8736v938jq.fsf@news-spur.riddles.org.uk
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>>>>> "Amit" == Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> writes:

Amit> Andrew also mentioned a workaround in his reply to use setString
Amit> such that JDBC doesn't pass 'MONTH' as of type 'text' and instead
Amit> as of unknown type. I could't find the documentation of Postgres
Amit> JDBC's setString to see how one can do that, but maybe you can
Amit> try it out.

Disclaimer: I don't do java stuff myself, all I know about this is from
reading the code.

First, there's a connection parameter stringtype=unspecified that
affects all setString calls on the connection. Second, there may be a
way to use setObject instead; setObject(1, str, Types.DISTINCT) looks
like it might work (or maybe Types.OTHER) - unless I'm completely
misreading the pgjdbc code, that should end up sending the right thing
to the server.

--
Andrew (irc:RhodiumToad)

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