Handle empty lists for newParquet

Author: marmbrus

sql/core/src/main/scala/org/apache/spark/sql/parquet/newParquet.scala

@@ -191,7 +191,10 @@ case class ParquetRelation2(path: String)(@transient val sqlContext: SQLContext)
     val selectedPartitions = partitions.filter(p => partitionFilters.forall(_(p)))
     val fs = FileSystem.get(new java.net.URI(path), sparkContext.hadoopConfiguration)
     val selectedFiles = selectedPartitions.flatMap(_.files).map(f => fs.makeQualified(f.getPath))
-    org.apache.hadoop.mapreduce.lib.input.FileInputFormat.setInputPaths(job, selectedFiles:_*)
+    // FileInputFormat cannot handle empty lists.
+    if (selectedFiles.nonEmpty) {
+      org.apache.hadoop.mapreduce.lib.input.FileInputFormat.setInputPaths(job, selectedFiles: _*)
+    }
 
     // Push down filters when possible
     predicates