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https://issues.apache.org/jira/browse/DRILL-2765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14493633#comment-14493633
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Masood Parvari commented on DRILL-2765:
---------------------------------------
Mohsen is right. it is a very annoying bug. I wish you guys could release a
patch as soon as possible instead of waiting till version 1.0
here I explain the problem with more details
Assume we are writing to parquet file using protobuf (or Avro). The proto file
looks like this:
message Log {
optional string date = 1;
optional string url = 2;
}
it is a reduced version of my problem. Now when writing to a parquet file
(Non-hadoop), I want to have a case in which for one of the columns there exist
no data at all (I am working on schema evolution). so I am just writing value
for 'date' column in parquet file and column 'url' is completely null through
all records. File is created successfully but when I am trying to query it by
apache drill, It throws a null pointer exception. If at least for one of
written records, I set 'url' field to a value, then it is ok and all other
'url' values can be null and drill can query it. But I need the case in which
in a parquet file, a whole column is null (but other parquet files may have
values for that column). please help me guys. my parquet version is : 1.6.0rc7
and apache drill version is 0.8.0.
> Throwing a NPE on exceuting query against parquet files
> --------------------------------------------------------
>
> Key: DRILL-2765
> URL: https://issues.apache.org/jira/browse/DRILL-2765
> Project: Apache Drill
> Issue Type: Sub-task
> Components: Storage - Parquet
> Affects Versions: 0.8.0
> Reporter: Mohsen Zainalpour
> Assignee: Steven Phillips
> Fix For: 1.0.0
>
>
> Executing a query on a parquet file that one of it`s columns haven`t any
> value at all(but field exists in the schema) thorws a NPE
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