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From "Kunal Khatua (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-6105) SYSTEM ERROR: NullPointerException
Date Mon, 05 Feb 2018 01:58:00 GMT

    [ https://issues.apache.org/jira/browse/DRILL-6105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351974#comment-16351974
] 

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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