dongjoon-hyun commented on a change in pull request #23285: [SPARK-26224][SQL]
Warn and advice the user when creating many project on subsequent calls to
withColumn
URL: https://github.com/apache/spark/pull/23285#discussion_r242286873
##########
File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
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@@ -2154,6 +2155,18 @@ class Dataset[T] private[sql](
colNames,
"in given column names",
sparkSession.sessionState.conf.caseSensitiveAnalysis)
+ var numProjects = 0
+ var currPlan = logicalPlan
+ while (currPlan.isInstanceOf[Project] && numProjects < 50) {
Review comment:
Yep. If we need to warn, +1 for adding new configuration for this value
instead of `50` here and line 2164.
`50` looks effective to detect this pattern, but can we have a higher value
which is more practically related to the warning messages(performance
degradation or OOM?)?
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