[SPARK-5029][SQL] Enable from follow multiple brackets

Enable from follow multiple brackets:
```
select key from ((select * from testData limit 1) union all (select * from testData limit 1)) x limit 1
```

Author: scwf <wangfei1@huawei.com>

Closes #3853 from scwf/from and squashes the following commits:

14f110a [scwf] enable from follow multiple brackets

1 files changed, 17 insertions, 0 deletions

diff --git a/sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
index add4e218a2..d9de5686dc 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
@@ -272,6 +272,23 @@ class SQLQuerySuite extends QueryTest with BeforeAndAfterAll {
       mapData.collect().take(1).toSeq)
   }
 
+  test("from follow multiple brackets") {
+    checkAnswer(sql(
+      "select key from ((select * from testData limit 1) union all (select * from testData limit 1)) x limit 1"),
+      1
+    )
+
+    checkAnswer(sql(
+      "select key from (select * from testData) x limit 1"),
+      1
+    )
+
+    checkAnswer(sql(
+      "select key from (select * from testData limit 1 union all select * from testData limit 1) x limit 1"),
+      1
+    )
+  }
+
   test("average") {
     checkAnswer(
       sql("SELECT AVG(a) FROM testData2"),