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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8139) Check for proper equals() and hashCode() when registering a table
Date Fri, 24 Nov 2017 12:46:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16265244#comment-16265244
] 

ASF GitHub Bot commented on FLINK-8139:
---------------------------------------

Github user fhueske commented on the issue:

    https://github.com/apache/flink/pull/5065
  
    Hi @Aegeaner, thanks for the pull request. 
    I had a brief look at it and noticed a few things:
    
    1. Please fill out the PR template (see #5063 as an example)
    2. Please add unit tests that validate that the checks you added are working correctly.

    3. Please update the `equals()` and `hashCode()` methods of `Row` as mentioned in the
JIRA issue.
    
    Thank you, Fabian


> Check for proper equals() and hashCode() when registering a table
> -----------------------------------------------------------------
>
>                 Key: FLINK-8139
>                 URL: https://issues.apache.org/jira/browse/FLINK-8139
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Aegeaner
>
> In the current Table API & SQL implementation we compare {{Row}}s at different positions.
E.g., for joining we test rows for equality or put them into state. A heap state backend requires
proper hashCode() and equals() in order to work correct. Thus, every type in the Table API
needs to have these methods implemented.
> We need to check if all fields of a row have implement methods that differ from {{Object.equals()}}
and {{Object.hashCode()}} via reflections. Both coming from TableSource and DataStream/DataSet.
> Additionally, for array types, the {{Row}} class should use {{Arrays.deepEquals()}} and
{{Arrays.deepHashCode()}} instead of the non-deep variants.



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