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From "Anton Mushin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5256) Extend DataSetSingleRowJoin to support Left and Right joins
Date Tue, 17 Jan 2017 07:51:26 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15825599#comment-15825599

Anton Mushin commented on FLINK-5256:

I update PR, but it is incorrect yet.
I have some problem with {MapJoinRightRunner}, more accurate in debug time I noticed what
I never came to {MapJoinRightRunner} for any sql queries with outer join. Does it make sense
support join with null records in {MapJoinRightRunner} in this case?

> Extend DataSetSingleRowJoin to support Left and Right joins
> -----------------------------------------------------------
>                 Key: FLINK-5256
>                 URL: https://issues.apache.org/jira/browse/FLINK-5256
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>    Affects Versions: 1.2.0
>            Reporter: Fabian Hueske
>            Assignee: Anton Mushin
> The {{DataSetSingleRowJoin}} is a broadcast-map join that supports arbitrary inner joins
where one input is a single row.
> I found that Calcite translates certain subqueries into non-equi left and right joins
with single input. These cases can be handled if the  {{DataSetSingleRowJoin}} is extended
to support outer joins on the non-single-row input, i.e., left joins if the right side is
single input and vice versa.

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