Fixes compilation error

Author: liancheng

sql/core/src/main/scala/org/apache/spark/sql/sources/ddl.scala

@@ -287,7 +287,7 @@ private[sql] object ResolvedDataSource {
           options)
         sqlContext.executePlan(
           InsertIntoFSBasedRelation(
-            r.asInstanceOf[FSBasedRelation],
+            r,
             data.logicalPlan,
             partitionColumns.toArray,
             mode)).toRdd

sql/hive/src/test/scala/org/apache/spark/sql/sources/SimpleTextRelation.scala

@@ -27,7 +27,6 @@ import org.apache.hadoop.mapreduce.lib.output.{FileOutputFormat, TextOutputForma
 import org.apache.hadoop.mapreduce.{RecordWriter, TaskAttemptContext}
 
 import org.apache.spark.rdd.RDD
-import org.apache.spark.sql.catalyst.CatalystTypeConverters
 import org.apache.spark.sql.catalyst.expressions.{Cast, Literal}
 import org.apache.spark.sql.types.{DataType, StructField, StructType}
 import org.apache.spark.sql.{Row, SQLContext}
@@ -40,7 +39,7 @@ class SimpleTextSource extends FSBasedRelationProvider {
       sqlContext: SQLContext,
       schema: Option[StructType],
       partitionColumns: Option[StructType],
-      parameters: Map[String, String]): BaseRelation = {
+      parameters: Map[String, String]): FSBasedRelation = {
     new SimpleTextRelation(
       Array(parameters("path")), schema,
       partitionColumns.getOrElse(StructType(Array.empty[StructField])), parameters)(sqlContext)