Github user vdiravka commented on a diff in the pull request:

    https://github.com/apache/drill/pull/644#discussion_r86615126
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/Metadata.java 
---
    @@ -927,15 +927,11 @@ public void setMax(Object max) {
         @JsonProperty List<ParquetFileMetadata_v2> files;
         @JsonProperty List<String> directories;
         @JsonProperty String drillVersion;
    -    @JsonProperty boolean isDateCorrect;
    +    @JsonProperty int writerVersion;
    --- End diff --
    
    I tried to figure out this and found that for reading parquet footer this 
class isn't used. For that purposes used `ParquetMetadata` from 
parquet-hadoop-1.8.1-drill-r0.jar.
    This class used for entire parquet directory with metadata cache file. When 
it is absent an empty of this class is created. 
    I added some javadoc. Hope it will help.


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