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[SPARK-13603][SQL] support SQL generation for subquery
## What changes were proposed in this pull request? This is support SQL generation for subquery expressions, which will be replaced to a SubqueryHolder inside SQLBuilder recursively. ## How was this patch tested? Added unit tests. Author: Davies Liu <davies@databricks.com> Closes #11453 from davies/sql_subquery.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala 0 additions, 2 deletions.../org/apache/spark/sql/catalyst/expressions/subquery.scala
- sql/hive/src/main/scala/org/apache/spark/sql/hive/SQLBuilder.scala 16 additions, 5 deletions...src/main/scala/org/apache/spark/sql/hive/SQLBuilder.scala
- sql/hive/src/test/scala/org/apache/spark/sql/hive/ExpressionToSQLSuite.scala 5 additions, 0 deletions...cala/org/apache/spark/sql/hive/ExpressionToSQLSuite.scala
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