[jira] [Commented] (SPARK-4493) Don't pushdown Eq, NotEq, Lt, LtEq, Gt and GtEq predicates with nulls for Parquet

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-4493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14254484#comment-14254484 ] 

Apache Spark commented on SPARK-4493:
-------------------------------------

User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/3748

> Don't pushdown Eq, NotEq, Lt, LtEq, Gt and GtEq predicates with nulls for Parquet
> ---------------------------------------------------------------------------------
>
>                 Key: SPARK-4493
>                 URL: https://issues.apache.org/jira/browse/SPARK-4493
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.1.0
>            Reporter: Cheng Lian
>            Assignee: Cheng Lian
>             Fix For: 1.3.0
>
>
> Predicates like {{a = NULL}} and {{a < NULL}} can't be pushed down since Parquet {{Lt}}, {{LtEq}}, {{Gt}}, {{GtEq}} doesn't accept null value. Not that {{Eq}} and {{NotEq}} can only be used with {{null}} to represent predicates like {{a IS NULL}} and {{a IS NOT NULL}}.
> However, normally this issue doesn't cause NPE because any value compared to {{NULL}} results {{NULL}}, and Spark SQL automatically optimizes out {{NULL}} predicate in the {{SimplifyFilters}} rule. Only testing code that intentionally disables the optimizer may trigger this issue. (That's why this issue is not marked as blocker).



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