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

    https://github.com/apache/carbondata/pull/1429#discussion_r149011985
  
    --- Diff: 
core/src/main/java/org/apache/carbondata/core/metadata/converter/ThriftWrapperSchemaConverterImpl.java
 ---
    @@ -392,9 +392,9 @@ private DataType 
fromExternalToWrapperDataType(org.apache.carbondata.format.Data
           case DATE:
             return DataTypes.DATE;
           case ARRAY:
    -        return DataTypes.ARRAY;
    +        return DataTypes.createDefaultArrayType();
    --- End diff --
    
    Can't we create actual array from the  child schemas here?


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