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From "Julian Hyde (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12839) Upgrade Hive to Calcite 1.6
Date Tue, 02 Feb 2016 19:08:40 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128815#comment-15128815
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Julian Hyde commented on HIVE-12839:
------------------------------------

[~pxiong], I was pretty sure I didn't add anything breaking after you validated the 1.6 RC,
but it looks as if I screwed up. Sorry about that. I think you can add a HiveValuesFactory
to the context used to create a RelBuilder, make it do something different for 0 rows (e.g.
create a Sort(limit 0) or a null scan) and that will solve the problem without needing any
changes to Calcite.

As an aside, if you could change Calcite, what would you want {{RelBuilder.empty}} to do?
I presume it is useful to convert {{LIMIT 0}} and {{WHERE FALSE}} to an empty relation, so
how would you propose to represent it in Hive?

> Upgrade Hive to Calcite 1.6
> ---------------------------
>
>                 Key: HIVE-12839
>                 URL: https://issues.apache.org/jira/browse/HIVE-12839
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-12839.01.patch, HIVE-12839.02.patch, HIVE-12839.03.patch
>
>
> CLEAR LIBRARY CACHE
> Upgrade Hive to Calcite 1.6.0-incubating.



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