Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/19479#discussion_r147886758
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/Statistics.scala
---
@@ -155,6 +156,8 @@ object ColumnStat extends Logging {
private val KEY_NULL_COUNT = "nullCount"
private val KEY_AVG_LEN = "avgLen"
private val KEY_MAX_LEN = "maxLen"
+ val KEY_HISTOGRAM = "histogram"
+ val KEY_HISTOGRAM_SEPARATOR = "-"
--- End diff --
they are used in `HiveExternalCatalog` for stats/properties conversion.
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