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https://issues.apache.org/jira/browse/SPARK-26654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16751855#comment-16751855
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Wenchen Fan commented on SPARK-26654:
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+1. I think we store string format instead of the actual long value, so that
stats can be human-readable. For correctness, the string format must be able to
convert back to the actual long value without ambiguity.
> Use Timestamp/DateFormatter in CatalogColumnStat
> ------------------------------------------------
>
> Key: SPARK-26654
> URL: https://issues.apache.org/jira/browse/SPARK-26654
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Maxim Gekk
> Priority: Major
>
> Need to switch fromExternalString on Timestamp/DateFormatters, in particular:
> https://github.com/apache/spark/blob/3b7395fe025a4c9a591835e53ac6ca05be6868f1/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala#L481-L482
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