vrozov commented on a change in pull request #1361: DRILL-6579: Added sanity 
checks to the Parquet reader to avoid infini…
URL: https://github.com/apache/drill/pull/1361#discussion_r201867001
 
 

 ##########
 File path: 
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/columnreaders/VarLenBulkPageReader.java
 ##########
 @@ -106,11 +107,13 @@ final void set(PageDataInfo pageInfoInput, boolean 
clear) {
     pageInfo.dictionaryValueReader = pageInfoInput.dictionaryValueReader;
     pageInfo.numPageValues = pageInfoInput.numPageValues;
     if (clear) {
-    buffer.clear();
-  }
+      buffer.clear();
+    }
   }
 
   final VarLenColumnBulkEntry getEntry(int valuesToRead) {
+    Preconditions.checkArgument(valuesToRead > 0, String.format("Number of 
values to read [%d] should be greater than zero", valuesToRead));
 
 Review comment:
   It may also be better to use Preconditions template instead of String 
template (sorry for the wrong example in my prior comment).

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