[SPARK-4825] [SQL] CTAS fails to resolve when created using saveAsTable

Fix bug when query like:
```
  test("save join to table") {
    val testData = sparkContext.parallelize(1 to 10).map(i => TestData(i, i.toString))
    sql("CREATE TABLE test1 (key INT, value STRING)")
    testData.insertInto("test1")
    sql("CREATE TABLE test2 (key INT, value STRING)")
    testData.insertInto("test2")
    testData.insertInto("test2")
    sql("SELECT COUNT(a.value) FROM test1 a JOIN test2 b ON a.key = b.key").saveAsTable("test")
    checkAnswer(
      table("test"),
      sql("SELECT COUNT(a.value) FROM test1 a JOIN test2 b ON a.key = b.key").collect().toSeq)
  }
```

Author: Cheng Hao <hao.cheng@intel.com>

Closes #3673 from chenghao-intel/spark_4825 and squashes the following commits:

e8cbd56 [Cheng Hao] alternate the pattern matching order for logical plan:CTAS
e004895 [Cheng Hao] fix bug

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala

@@ -121,7 +121,7 @@ case class CreateTableAsSelect[T](
     allowExisting: Boolean,
     desc: Option[T] = None) extends UnaryNode {
   override def output = Seq.empty[Attribute]
-  override lazy val resolved = (databaseName != None && childrenResolved)
+  override lazy val resolved = databaseName != None && childrenResolved
 }
 
 case class WriteToFile(

sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala

@@ -261,6 +261,8 @@ private[hive] class HiveMetastoreCatalog(hive: HiveContext) extends Catalog with
       // Wait until children are resolved.
       case p: LogicalPlan if !p.childrenResolved => p
 
+      // TODO extra is in type of ASTNode which means the logical plan is not resolved
+      // Need to think about how to implement the CreateTableAsSelect.resolved
       case CreateTableAsSelect(db, tableName, child, allowExisting, Some(extra: ASTNode)) =>
         val (dbName, tblName) = processDatabaseAndTableName(db, tableName)
         val databaseName = dbName.getOrElse(hive.sessionState.getCurrentDatabase)
@@ -285,6 +287,13 @@ private[hive] class HiveMetastoreCatalog(hive: HiveContext) extends Catalog with
         }
 
         CreateTableAsSelect(Some(databaseName), tblName, child, allowExisting, desc)
+
+      case p: LogicalPlan if p.resolved => p
+
+      case p @ CreateTableAsSelect(db, tableName, child, allowExisting, None) =>
+        val (dbName, tblName) = processDatabaseAndTableName(db, tableName)
+        val databaseName = dbName.getOrElse(hive.sessionState.getCurrentDatabase)
+        CreateTableAsSelect(Some(databaseName), tblName, child, allowExisting, None)
     }
   }
 

sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/SQLQuerySuite.scala

@@ -137,6 +137,19 @@ class SQLQuerySuite extends QueryTest {
       sql("SELECT key, value FROM src ORDER BY key").collect().toSeq)
   }
 
+  test("SPARK-4825 save join to table") {
+    val testData = sparkContext.parallelize(1 to 10).map(i => TestData(i, i.toString))
+    sql("CREATE TABLE test1 (key INT, value STRING)")
+    testData.insertInto("test1")
+    sql("CREATE TABLE test2 (key INT, value STRING)")
+    testData.insertInto("test2")
+    testData.insertInto("test2")
+    sql("SELECT COUNT(a.value) FROM test1 a JOIN test2 b ON a.key = b.key").saveAsTable("test")
+    checkAnswer(
+      table("test"),
+      sql("SELECT COUNT(a.value) FROM test1 a JOIN test2 b ON a.key = b.key").collect().toSeq)
+  }
+
   test("SPARK-3708 Backticks aren't handled correctly is aliases") {
     checkAnswer(
       sql("SELECT k FROM (SELECT `key` AS `k` FROM src) a"),