Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/11084#discussion_r51980826 --- 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 -- Yeah, let me do it now. Thanks!
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