[SPARK-7123] [SQL] support table.star in sqlcontext

Run following sql get error
`SELECT r.*
FROM testData l join testData2 r on (l.key = r.a)`

Author: scwf <[email protected]>

Closes apache#5690 from scwf/tablestar and squashes the following commits:

3b2e2b6 [scwf] support table.star

Author: scwf

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/SqlParser.scala

@@ -365,6 +365,7 @@ class SqlParser extends AbstractSparkSQLParser with DataTypeParser {
 
   protected lazy val baseExpression: Parser[Expression] =
     ( "*" ^^^ UnresolvedStar(None)
+    | ident <~ "." ~ "*" ^^ { case tableName  => UnresolvedStar(Option(tableName)) }
     | primary
     )
 

sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala

@@ -51,6 +51,16 @@ class SQLQuerySuite extends QueryTest with BeforeAndAfterAll {
       Row("1", 1) :: Row("2", 1) :: Row("3", 1) :: Nil)
   }
 
+  test("support table.star") {
+    checkAnswer(
+      sql(
+        """
+          |SELECT r.*
+          |FROM testData l join testData2 r on (l.key = r.a)
+        """.stripMargin),
+      Row(1, 1) :: Row(1, 2) :: Row(2, 1) :: Row(2, 2) :: Row(3, 1) :: Row(3, 2) :: Nil)
+  }
+
   test("self join with alias in agg") {
       Seq(1,2,3)
         .map(i => (i, i.toString))