Please also attach the query profile if you can.

Thanks
James

On 2022/01/31 08:09, luoc wrote:
Hi Daniel,
   What is the data type of the `_id` field? The default ObjectId, or String or 
key-value pair (Struct)?

On Jan 31, 2022, at 11:12, Daniel Clark <[email protected]> wrote:


Hello,

I'm running this mongo query on the 1.20.0-SNAPSHOT build. It runs without 
error on the 1.19 release.

SELECT `Elements_Efforts`.`EffortTypeName` AS `EffortTypeName`,
   `Elements`.`ElementSubTypeName` AS `ElementSubTypeName`,
   `Elements`.`ElementTypeName` AS `ElementTypeName`,
   `Elements`.`PlanID` AS `PlanID`
FROM `mongo.grounds`.`Elements` `Elements`
   INNER JOIN `mongo.grounds`.`Elements_Efforts` `Elements_Efforts` ON 
(`Elements`.`_id` = `Elements_Efforts`.`_id`)
WHERE (`Elements`.`PlanID` = '1623263140')
GROUP BY `Elements_Efforts`.`EffortTypeName`,
   `Elements`.`ElementSubTypeName`,
   `Elements`.`ElementTypeName`,
   `Elements`.`PlanID`

The error message returned is:

org.apache.drill.common.exceptions.UserRemoteException: SYSTEM ERROR: 
UnsupportedOperationException: Map, Array, Union or repeated scalar type should 
not be used in group by, order by or in a comparison operator. Drill does not 
support compare between MAP:REQUIRED and MAP:REQUIRED.

Fragment: 0:0

Please, refer to logs for more information.

[Error Id: 21b3260d-9ebf-4156-a5fa-4748453b5465 on localhost:31010]

I've tried searching the mailing list archives, as well as googling the error. 
The stack trace mentions that memory was leaked by the query. Any ideas? Full 
stack trace attached.
<stacktrace.txt>

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