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From "Wenchen Fan (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-17897) not isnotnull is converted to the always false condition isnotnull && not isnotnull
Date Wed, 30 Nov 2016 11:42:58 GMT

     [ https://issues.apache.org/jira/browse/SPARK-17897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wenchen Fan resolved SPARK-17897.
---------------------------------
       Resolution: Fixed
         Assignee: Xiao Li
    Fix Version/s: 2.1.0

> not isnotnull is converted to the always false condition isnotnull && not isnotnull
> -----------------------------------------------------------------------------------
>
>                 Key: SPARK-17897
>                 URL: https://issues.apache.org/jira/browse/SPARK-17897
>             Project: Spark
>          Issue Type: Bug
>          Components: Optimizer
>    Affects Versions: 2.0.0, 2.0.1
>            Reporter: Jordan Halterman
>            Assignee: Xiao Li
>              Labels: correctness
>             Fix For: 2.1.0
>
>
> When a logical plan is built containing the following somewhat nonsensical filter:
> {{Filter (NOT isnotnull($f0#212))}}
> During optimization the filter is converted into a condition that will always fail:
> {{Filter (isnotnull($f0#212) && NOT isnotnull($f0#212))}}
> This appears to be caused by the following check for {{NullIntolerant}}:
> https://github.com/apache/spark/commit/df68beb85de59bb6d35b2a8a3b85dbc447798bf5#diff-203ac90583cebe29a92c1d812c07f102R63
> Which recurses through the expression and extracts nested {{IsNotNull}} calls, converting
them to {{IsNotNull}} calls on the attribute at the root level:
> https://github.com/apache/spark/commit/df68beb85de59bb6d35b2a8a3b85dbc447798bf5#diff-203ac90583cebe29a92c1d812c07f102R49
> This results in the nonsensical condition above.



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