[SPARK-14387][SQL] Exceptions thrown when querying ORC tables

Author: rbalamohan

sql/hive/src/main/scala/org/apache/spark/sql/hive/orc/OrcFileFormat.scala

@@ -105,17 +105,14 @@ private[sql] class OrcFileFormat
       dataSchema: StructType,
       physicalSchema: StructType,
       requiredSchema: StructType): StructType = {
-    /**
-      * requiredSchema names might not match with physical schema names.
-      *
-      * This is especially true when data is generated via Hive wherein
-      * orc files would have column names as _col0, _col1 etc. This is
-      * fixed in Hive 2.0, where in physical col names would match that
-      * of metastore.
-      *
-      * To make it backward compatible, it is required to map physical
-      * names to that of requiredSchema.
-      */
+
+    // requiredSchema names might not match with physical schema names.
+    // This is especially true when data is generated via Hive wherein
+    // orc files would have column names as _col0, _col1 etc. This is
+    // fixed in Hive 2.0, where in physical col names would match that
+    // of metastore. To make it backward compatible, it is required to
+    // map physical names to that of requiredSchema.
+
     // for requiredSchema, get the ordinal from dataSchema
     val ids = requiredSchema.map(a => dataSchema.fieldIndex(a.name): Integer).sorted