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https://issues.apache.org/jira/browse/DRILL-6107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351971#comment-16351971
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Kunal Khatua commented on DRILL-6107:
-------------------------------------

Did you try enclosing the word with accent quotes? 
{code:sql}
select `ports` from mongo.ivre.hosts;
{code}

> NullPointerException while querying MongoDB collection
> ------------------------------------------------------
>
>                 Key: DRILL-6107
>                 URL: https://issues.apache.org/jira/browse/DRILL-6107
>             Project: Apache Drill
>          Issue Type: Bug
>          Components:  Server
>    Affects Versions: 1.11.0, 1.12.0
>         Environment: Drill specific
> {noformat}
> export DRILL_HEAP=${DRILL_HEAP:-"1G"}
> export DRILL_MAX_DIRECT_MEMORY=${DRILL_MAX_DIRECT_MEMORY:-"2G"}
> {noformat}
> Other
> {noformat}
> Memory: 8 GiB
> Processor: 2 VCPU (Intel i7)
> Disk: 19 GiB (13 GiB free)
> OS: Ubuntu 16.06
> Java: OpenJDK 1.8.0_151
> {noformat}
>            Reporter: Duarte Silva
>            Priority: Major
>         Attachments: collection.bson.log, drillbit.log
>
>
> I have installed Drill and configured it to connect to a MongoDB instance. 
> That instance as a collection with a single document. When I query that 
> collection using:
> {code:sql}
> select ports from mongo.ivre.hosts;{code}
> It fails with a NullPointerException. I'm able to query that collection as 
> long as I don't select the "ports" property. Looking at the exception stack 
> trace and respective Drill code it is clear that the "map" variable isn't 
> suppose to be "null".
> {code:java}
> public MapOrListWriter list(final String name) {
>   assert map != null;
>   return new MapOrListWriterImpl(map.list(name));
> }
> {code}
> I couldn't figure out why it wasn't being initialized. I have attached the 
> log and the collection BSON file. Thanks in advance.



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