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https://issues.apache.org/jira/browse/DRILL-2352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14342857#comment-14342857
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Bhallamudi Venkata Siva Kamesh commented on DRILL-2352:
-------------------------------------------------------
This issue is fixed recently and will be available in the 0.8.0 release. Also,
there is a patch available to address * queries also. Refer
[DRILL-1692|https://issues.apache.org/jira/browse/DRILL-1692] . This is also
targeted for 0.8.0 release.
> MongoDB join queries can't select fields
> ----------------------------------------
>
> Key: DRILL-2352
> URL: https://issues.apache.org/jira/browse/DRILL-2352
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - MongoDB
> Affects Versions: 0.7.0
> Environment: Ubuntu 14.04 64 bits, OpenJDK 1.7.0_75, Mongo 2.6.8
> Reporter: Mariano Ruiz
> Assignee: B Anil Kumar
>
> When I perform this *JOIN* query between two MongoDB documents, there is no
> problem:
> {code:sql}
> select * from zips as z join states as s on z.state = s.code;
> {code}
> Result:
> {code}
> +------------+------------+
> | * | *0 |
> +------------+------------+
> | { "city" : "AGAWAM" , "loc" : [ -72.622739 , 42.070206] , "pop" : 15338 ,
> "state" : "MA"} | { "code" : "CA" , "name" : "California"} |
> | { "city" : "AGAWAM" , "loc" : [ -72.622739 , 42.070206] , "pop" : 15338 ,
> "state" : "MA"} | { "code" : "DC" , "name" : "Washington"} |
> | { "city" : "AGAWAM" , "loc" : [ -72.622739 , 42.070206] , "pop" : 15338 ,
> "state" : "MA"} | { "code" : "NY" , "name" : "New York"} |
> | { "city" : "CUSHMAN" , "loc" : [ -72.51565 , 42.377017] , "pop" : 36963 ,
> "state" : "MA"} | { "code" : "CA" , "name" : "California"} |
> | { "city" : "CUSHMAN" , "loc" : [ -72.51565 , 42.377017] , "pop" : 36963 ,
> "state" : "MA"} | { "code" : "DC" , "name" : "Washington"} |
> {code}
> But when I try to select which field I want to see I get this:
> {code}
> 0: jdbc:drill:zk=local> select z.city, s.name from zips as z join states as s
> on z.state = s.code;
> Query failed: Query failed: Unexpected exception during fragment
> initialization: null
> Error: exception while executing query: Failure while executing query.
> (state=,code=0)
> {code}
> I realized after a few tests, that the problem is you can't specify a column
> from the table left operator in the JOIN-ON clause.
> For example, this works:
> {code}
> jdbc:drill:zk=local> select z.city from states as s join zips as z on s.code
> = z.state limit 5;
> +------------+
> | city |
> +------------+
> | LOS ANGELES |
> | TRUCKEE |
> | TRUCKEE |
> | SOUTH LAKE TAHOE |
> | TAHOE VISTA |
> {code}
> But this doesn't:
> {code}
> jdbc:drill:zk=local> select s.name from states as s join zips as z on s.code
> = z.state limit 5;
> +------------+
> | name |
> +------------+
> +------------+
> {code}
> The same occurs in the WHERE clause, for example this works:
> {code:sql}
> select z.city from states as s join zips as z on s.code = z.state where
> z.city = 'LOS ANGELES';
> {code}
> And this doesn't:
> {code}
> 0: jdbc:drill:zk=local> select z.city from states as s join zips as z on
> s.code = z.state where s.code = 'CA' limit 5;
> Query failed: Query failed: Unexpected exception during fragment
> initialization: null
> Error: exception while executing query: Failure while executing query.
> (state=,code=0)
> {code}
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