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https://issues.apache.org/jira/browse/SPARK-20318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15967210#comment-15967210
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Apache Spark commented on SPARK-20318:
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User 'wzhfy' has created a pull request for this issue:
https://github.com/apache/spark/pull/17630
> Use Catalyst type for min/max in ColumnStat for ease of estimation
> ------------------------------------------------------------------
>
> Key: SPARK-20318
> URL: https://issues.apache.org/jira/browse/SPARK-20318
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Zhenhua Wang
>
> Currently when estimating predicates like col > literal or col = literal, we
> will update min or max in column stats based on literal value. However,
> literal value is of Catalyst type (internal type), while min/max is of
> external type. This causes unnecessary conversion when comparing them and
> updating column stats.
> To solve this, we can use Catalyst type for min/max in ColumnStat for ease of
> estimation. Note that the persistent form in metastore is still of external
> type, so there's no inconsistency for statistics in metastore.
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