JkSelf commented on code in PR #40914:
URL: https://github.com/apache/spark/pull/40914#discussion_r1174808234
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sql/core/src/main/scala/org/apache/spark/sql/execution/stat/StatFunctions.scala:
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@@ -288,7 +288,7 @@ object StatFunctions extends Logging {
}
// If there is no selected columns, we don't need to run this aggregate,
so make it a lazy val.
- lazy val aggResult = ds.select(aggExprs:
_*).queryExecution.toRdd.collect().head
+ lazy val aggResult = ds.select(aggExprs:
_*).queryExecution.toRdd.map(_.copy()).collect().head
Review Comment:
Thanks @cloud-fan for the valuable information. @HyukjinKwon @zhengruifeng
can we follow the suggestion from wenchen to merge this PR without testing?
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