Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/7774#discussion_r36117186
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -119,6 +119,9 @@ class DataFrame private[sql](
@transient val sqlContext: SQLContext,
@DeveloperApi @transient val queryExecution:
SQLContext#QueryExecution) extends Serializable {
+ // Note for Spark contributors: if adding or updating any action in
`DataFrame`, please make sure
+ // you wrap it with `withNewExecution` if this actions doesn't call
other action.
--- End diff --
also: if this actions doesn't call other action -> if this action doesn't
call other actions
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