[GitHub] cloud-fan commented on a change in pull request #23662: [SPARK-26740][SPARK-26654][SQL] Make statistics of timestamp/date columns independent from system time zones

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cloud-fan commented on a change in pull request #23662: [SPARK-26740][SPARK-26654][SQL] Make statistics of timestamp/date columns independent from system time zones
URL: https://github.com/apache/spark/pull/23662#discussion_r252909018
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala
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 @@ -472,14 +474,24 @@ object CatalogColumnStat extends Logging {
   private val KEY_MAX_LEN = "maxLen"
   private val KEY_HISTOGRAM = "histogram"
 
+  val VERSION = 2
 
 Review comment:
   we can't. Version is an internal property of CBO stats, which can only be increased when we change format.

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