### Eclipse Workspace Patch 1.0 #P hive-TRUNK Index: ql/src/java/org/apache/hadoop/hive/ql/io/merge/MergeTask.java =================================================================== --- ql/src/java/org/apache/hadoop/hive/ql/io/merge/MergeTask.java (revision 1618794) +++ ql/src/java/org/apache/hadoop/hive/ql/io/merge/MergeTask.java (working copy) @@ -373,6 +373,10 @@ } } + if (format == null || format.trim().equals("")) { + printUsage(); + } + MergeWork mergeWork = null; if (format.equals("rcfile")) { mergeWork = new MergeWork(inputPaths, new Path(outputDir), RCFileInputFormat.class);