Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/14048#discussion_r69659690
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -184,7 +183,8 @@ class Dataset[T] private[sql](
// to happen right away to let these side effects take place eagerly.
case p if hasSideEffects(p) =>
LogicalRDD(queryExecution.analyzed.output,
queryExecution.toRdd)(sparkSession)
- case Union(children) if children.forall(hasSideEffects) =>
+ case Union(children) if children.forall(x =>
+ x.isInstanceOf[InsertIntoTable] ||
x.isInstanceOf[InsertIntoHadoopFsRelationCommand]) =>
--- End diff --
1. If you want to allow union query containing side effect, 'forall' should
be replaced 'exists'.
2. If you want to allow multi-insert syntax only(not union query), we
should do this.
I think 2 was your intention before.
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