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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1628) Strange behavior of "where" function during a join
Date Tue, 03 Mar 2015 17:14:05 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14345350#comment-14345350
] 

Aljoscha Krettek commented on FLINK-1628:
-----------------------------------------

[~fhueske] and I found the bug in the optimizer. We still have to run some tests, though,
to be sure.

> Strange behavior of "where" function during a join
> --------------------------------------------------
>
>                 Key: FLINK-1628
>                 URL: https://issues.apache.org/jira/browse/FLINK-1628
>             Project: Flink
>          Issue Type: Bug
>    Affects Versions: 0.9
>            Reporter: Daniel Bali
>              Labels: batch
>
> Hello!
> If I use the `where` function with a field list during a join, it exhibits strange behavior.
> Here is the sample code that triggers the error: https://gist.github.com/balidani/d9789b713e559d867d5c
> This example joins a DataSet with itself, then counts the number of rows. If I use `.where(0,
1)` the result is (22), which is not correct. If I use `EdgeKeySelector`, I get the correct
result (101).
> When I pass a field list to the `equalTo` function (but not `where`), everything works
again.
> If I don't include the `groupBy` and `reduceGroup` parts, everything works.
> Also, when working with large DataSets, passing a field list to `where` makes it incredibly
slow, even though I don't see any exceptions in the log (in DEBUG mode).
> Does anybody know what might cause this problem?
> Thanks!



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