Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7201#discussion_r33831527
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/stat/StatFunctions.scala
---
@@ -110,8 +110,12 @@ private[sql] object StatFunctions extends Logging {
logWarning("The maximum limit of 1e6 pairs have been collected,
which may not be all of " +
"the pairs. Please try reducing the amount of distinct items in
your columns.")
}
+ def cleanElement(element: Any): String = {
+ if (element == null) "" else element.toString
--- End diff --
we should probably say "null" rather than empty for null
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