Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/11084#discussion_r51976383
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/SQLBuilder.scala ---
@@ -142,7 +142,15 @@ class SQLBuilder(logicalPlan: LogicalPlan, sqlContext:
SQLContext) extends Loggi
Some(s"`$database`.`$table`")
case Subquery(alias, child) =>
- toSQL(child).map(childSQL => s"($childSQL) AS $alias")
+ toSQL(child).map( childSQL =>
+ child match {
+ // Parentheses is not used for persisted data source relations
+ // e.g., select x.c1 from (t1) as x inner join (t1) as y on x.c1
= y.c1
+ case Subquery(_, l: LogicalRelation) =>
+ s"$childSQL AS $alias"
--- End diff --
Should we also handle `MetastoreRelation` here?
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