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From "Mariano Ruiz (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-2352) MongoDB join queries can't select fields
Date Mon, 02 Mar 2015 05:57:04 GMT
Mariano Ruiz created DRILL-2352:
-----------------------------------

             Summary: 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 z.city, s.name 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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