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From "Bhallamudi Venkata Siva Kamesh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-2352) MongoDB join queries can't select fields
Date Mon, 02 Mar 2015 07:07:04 GMT

    [ https://issues.apache.org/jira/browse/DRILL-2352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14342857#comment-14342857
] 

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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