Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10577#discussion_r49799631
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/SQLBuilder.scala ---
@@ -129,10 +129,13 @@ class SQLBuilder(logicalPlan: LogicalPlan,
sqlContext: SQLContext) extends Loggi
conditionSQL = condition.sql
} yield s"$childSQL $whereOrHaving $conditionSQL"
- case Union(left, right) =>
+ case Union(children) if children.length == 1 =>
+ toSQL(children.head)
--- End diff --
this branch is not needed, `Union` will always have more than one child
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