[SPARK-5472][SQL] Fix Scala code style

Fix Scala code style.

Author: Hung Lin <hung@zoomdata.com>

Closes #4464 from hunglin/SPARK-5472 and squashes the following commits:

ef7a3b3 [Hung Lin] SPARK-5472: fix scala style

2 files changed, 41 insertions, 36 deletions

diff --git a/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRDD.scala b/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRDD.scala
index a2f94675fb..0bec32cca1 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRDD.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRDD.scala
@@ -17,13 +17,10 @@
 
 package org.apache.spark.sql.jdbc
 
-import java.sql.{Connection, DatabaseMetaData, DriverManager, ResultSet, ResultSetMetaData, SQLException}
-import scala.collection.mutable.ArrayBuffer
+import java.sql.{Connection, DriverManager, ResultSet, ResultSetMetaData, SQLException}
 
 import org.apache.spark.{Logging, Partition, SparkContext, TaskContext}
 import org.apache.spark.rdd.RDD
-import org.apache.spark.util.NextIterator
-import org.apache.spark.sql.catalyst.analysis.HiveTypeCoercion
 import org.apache.spark.sql.catalyst.expressions.{Row, SpecificMutableRow}
 import org.apache.spark.sql.types._
 import org.apache.spark.sql.sources._
@@ -100,7 +97,7 @@ private[sql] object JDBCRDD extends Logging {
       try {
         val rsmd = rs.getMetaData
         val ncols = rsmd.getColumnCount
-        var fields = new Array[StructField](ncols);
+        val fields = new Array[StructField](ncols)
         var i = 0
         while (i < ncols) {
           val columnName = rsmd.getColumnName(i + 1)
@@ -176,23 +173,27 @@ private[sql] object JDBCRDD extends Logging {
    *
    * @return An RDD representing "SELECT requiredColumns FROM fqTable".
    */
-  def scanTable(sc: SparkContext,
-                schema: StructType,
-                driver: String,
-                url: String,
-                fqTable: String,
-                requiredColumns: Array[String],
-                filters: Array[Filter],
-                parts: Array[Partition]): RDD[Row] = {
+  def scanTable(
+      sc: SparkContext,
+      schema: StructType,
+      driver: String,
+      url: String,
+      fqTable: String,
+      requiredColumns: Array[String],
+      filters: Array[Filter],
+      parts: Array[Partition]): RDD[Row] = {
+
     val prunedSchema = pruneSchema(schema, requiredColumns)
 
-    return new JDBCRDD(sc,
-        getConnector(driver, url),
-        prunedSchema,
-        fqTable,
-        requiredColumns,
-        filters,
-        parts)
+    return new
+        JDBCRDD(
+          sc,
+          getConnector(driver, url),
+          prunedSchema,
+          fqTable,
+          requiredColumns,
+          filters,
+          parts)
   }
 }
 
@@ -412,6 +413,5 @@ private[sql] class JDBCRDD(
       gotNext = false
       nextValue
     }
-
   }
 }
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRelation.scala b/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRelation.scala
index e09125e406..66ad38eb7c 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRelation.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRelation.scala
@@ -96,7 +96,8 @@ private[sql] class DefaultSource extends RelationProvider {
 
     if (driver != null) Class.forName(driver)
 
-    if (   partitionColumn != null
+    if (
+      partitionColumn != null
         && (lowerBound == null || upperBound == null || numPartitions == null)) {
       sys.error("Partitioning incompletely specified")
     }
@@ -104,30 +105,34 @@ private[sql] class DefaultSource extends RelationProvider {
     val partitionInfo = if (partitionColumn == null) {
       null
     } else {
-      JDBCPartitioningInfo(partitionColumn,
-                           lowerBound.toLong, upperBound.toLong,
-                           numPartitions.toInt)
+      JDBCPartitioningInfo(
+        partitionColumn,
+        lowerBound.toLong,
+        upperBound.toLong,
+        numPartitions.toInt)
     }
     val parts = JDBCRelation.columnPartition(partitionInfo)
     JDBCRelation(url, table, parts)(sqlContext)
   }
 }
 
-private[sql] case class JDBCRelation(url: String,
-                                     table: String,
-                                     parts: Array[Partition])(
-    @transient val sqlContext: SQLContext)
-  extends PrunedFilteredScan {
+private[sql] case class JDBCRelation(
+    url: String,
+    table: String,
+    parts: Array[Partition])(@transient val sqlContext: SQLContext) extends PrunedFilteredScan {
 
   override val schema = JDBCRDD.resolveTable(url, table)
 
   override def buildScan(requiredColumns: Array[String], filters: Array[Filter]) = {
     val driver: String = DriverManager.getDriver(url).getClass.getCanonicalName
-    JDBCRDD.scanTable(sqlContext.sparkContext,
-                      schema,
-                      driver, url,
-                      table,
-                      requiredColumns, filters,
-                      parts)
+    JDBCRDD.scanTable(
+      sqlContext.sparkContext,
+      schema,
+      driver,
+      url,
+      table,
+      requiredColumns,
+      filters,
+      parts)
   }
 }