Kunal Khatua commented on DRILL-6105:

Could you share more details about the setup, like Hive version, platform, etc. 
? I take it you don't hit this issue with the older Drill 1.8.0 version.

> SYSTEM ERROR: NullPointerException
> ----------------------------------
>                 Key: DRILL-6105
>                 URL: https://issues.apache.org/jira/browse/DRILL-6105
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Flow
>    Affects Versions: 1.12.0
>            Reporter: Nitin Pawar
>            Priority: Critical
> We just upgraded drill from 1.8.0 to 1.12.0
> One of the issue which left us behind was whenever we upgraded Drill we were 
> hit will null pointer exception in scenario which we could not spend time 
> debugging. Then we rolled back to 1.8.0
> This time we have spent some time and understood the problem
> data set: 3 million records
> 5 columns, 2 of which are date columns (Let us call these date columns as A 
> and B)
> In column B majority of the values are nulls (roughly 99.5%)
> our query is select * from table where A = B
> above query fails with null pointer exception where the number of underlying 
> parquet files are more than 1. If I merge the underlying parquet files into a 
> single large file then we do not see this issue. 
> We also were able to remove the error if we changed the where clause with 
> coalesce(A,null) = coalesce(B,null)
> This somehow points us that the error is coming while reading the parquet 
> files with the given data types.

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