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https://issues.apache.org/jira/browse/SPARK-4493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust resolved SPARK-4493.
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Resolution: Fixed
Fix Version/s: 1.3.0
Issue resolved by pull request 3367
[https://github.com/apache/spark/pull/3367]
> 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
> 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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