Mapr [SPARK-248] MapRDBTableScanRDD fails to convert to Scala Dataframe when using where clause (apache#289)

Author: Mikhail Gorbov

external/maprdb/src/main/scala/com/mapr/db/spark/sql/DefaultSource.scala

@@ -46,7 +46,7 @@ class DefaultSource
                               schema: StructType): BaseRelation = {
     val condition: Option[QueryCondition] = parameters
       .get("QueryCondition")
-      .map(cond => ConditionImpl.parseFrom(ByteBuffer.wrap(cond.getBytes)))
+      .map(cond => ConditionImpl.parseFrom(ByteBuffer.wrap(cond.getBytes("ISO-8859-1"))))
 
     createMapRDBRelation(
       sqlContext,

external/maprdb/src/main/scala/com/mapr/db/spark/utils/MapRSpark.scala

@@ -174,20 +174,18 @@ case class MapRSpark(sparkSession: Option[SparkSession],
       .option("tablePath", this.tableName.get)
       .option("sampleSize", sampleSize)
 
-    val readerWithCondition =
       if (cond.isDefined) {
         reader.option("QueryCondition",
         new String(
           cond.get.condition
             .asInstanceOf[ConditionImpl]
             .getDescriptor
             .getSerialized
-            .array))
-    }
-
-
+            .array,
+          "ISO-8859-1"
+        ))
+      }
 
-    val readerWithProjection =
       if (columns.isDefined) {
       reader.option(
         "ColumnProjection",