Guillaume Champion created DRILL-5088: -----------------------------------------
Summary: Error when reading DBRef column Key: DRILL-5088 URL: https://issues.apache.org/jira/browse/DRILL-5088 Project: Apache Drill Issue Type: Bug Components: Execution - Data Types Environment: drill 1.9.0 mongo 3.2 Reporter: Guillaume Champion In a mongo database with DBRef, when a DBRef is inserted in the first line of mongo's collection drill query failed : {code} 0: jdbc:drill:zk=local> select * from mongo.mydb.contact2; Error: SYSTEM ERROR: CodecConfigurationException: Can't find a codec for class com.mongodb.DBRef. {code} Simple example to reproduce: In mongo instance {code} db.contact2.drop(); db.contact2.insert({ "_id" : ObjectId("582081d96b69060001fd8938"), "account" : DBRef("contact", ObjectId("999cbf116b69060001fd8611")) }); {code} In drill : {code} 0: jdbc:drill:zk=local> select * from mongo.mydb.contact2; Error: SYSTEM ERROR: CodecConfigurationException: Can't find a codec for class com.mongodb.DBRef. [Error Id: 2944d766-e483-4453-a706-3d481397b186 on Analytics-Biznet:31010] (state=,code=0) {code} If the first line doesn't contain de DBRef, drill will querying correctly : In a mongo instance : {code} db.contact2.drop(); db.contact2.insert({ "_id" : ObjectId("582081d96b69060001fd8939") }); db.contact2.insert({ "_id" : ObjectId("582081d96b69060001fd8938"), "account" : DBRef("contact", ObjectId("999cbf116b69060001fd8611")) }); {code} In drill : {code} 0: jdbc:drill:zk=local> select * from mongo.mydb.contact2; +--------------------------------------+---------------------------------------------------------------+ | _id | account | +--------------------------------------+---------------------------------------------------------------+ | {"$oid":"582081d96b69060001fd8939"} | {"$id":{}} | | {"$oid":"582081d96b69060001fd8938"} | {"$ref":"contact","$id":{"$oid":"999cbf116b69060001fd8611"}} | +--------------------------------------+---------------------------------------------------------------+ 2 rows selected (0,563 seconds) {code} -- This message was sent by Atlassian JIRA (v6.3.4#6332)