fix implemented-error

Author: scwf

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala

@@ -121,7 +121,7 @@ case class Alias(child: Expression, name: String)
     }
   }
 
-  override def toString: String = s"$child AS $name#${exprId.id}$typeSuffix"
+  override def toString: String = s"$child AS $name#${exprId.id}"
 
   override protected final def otherCopyArgs = exprId :: qualifiers :: Nil
 }

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

@@ -27,7 +27,7 @@ import scala.util.Try
 import org.apache.hadoop.hive.conf.HiveConf.ConfVars
 
 import org.apache.spark.{SparkFiles, SparkException}
-import org.apache.spark.sql.{DataFrame, Row}
+import org.apache.spark.sql.{AnalysisException, DataFrame, Row}
 import org.apache.spark.sql.catalyst.plans.logical.Project
 import org.apache.spark.sql.Dsl._
 import org.apache.spark.sql.hive._
@@ -575,6 +575,12 @@ class HiveQuerySuite extends HiveComparisonTest with BeforeAndAfter {
     }
   }
 
+  test("analyzer should not throw NotImplementedError") {
+    intercept[AnalysisException] {
+      sql("SELECT CAST(x AS STRING) FROM src").collect()
+    }
+  }
+
   def isExplanation(result: DataFrame) = {
     val explanation = result.select('plan).collect().map { case Row(plan: String) => plan }
     explanation.contains("== Physical Plan ==")