[jira] [Created] (DRILL-1911) Querying same field multiple times with different case would hit memory leak and return incorrect result.

["Jinfeng Ni (JIRA)" <ji...@apache.org>]

Jinfeng Ni created DRILL-1911:
---------------------------------

             Summary: Querying same field multiple times with different case would hit memory leak and return incorrect result. 
                 Key: DRILL-1911
                 URL: https://issues.apache.org/jira/browse/DRILL-1911
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Jinfeng Ni


git.commit.id.abbrev=309e1be

If query the same field twice, with different case, Drill will throw memory assertion error. 

 select employee_id, Employee_id from cp.`employee.json` limit 2;
+-------------+
| employee_id |
+-------------+
| 1           |
| 2           |
Query failed: Query failed: Failure while running fragment., Attempted to close accountor with 2 buffer(s) still allocatedfor QueryId: 2b5cc8eb-2817-aadb-e0fa-49272796592a, MajorFragmentId: 0, MinorFragmentId: 0.


     Total 1 allocation(s) of byte size(s): 4096, at stack location:
          org.apache.drill.exec.memory.TopLevelAllocator$ChildAllocator.buffer(TopLevelAllocator.java:212)
          org.apache.drill.exec.vector.UInt1Vector.allocateNewSafe(UInt1Vector.java:137)
          org.apache.drill.exec.vector.NullableBigIntVector.allocateNewSafe(NullableBigIntVector.java:173)
          org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.doAlloc(ProjectRecordBatch.java:229)
          org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.doWork(ProjectRecordBatch.java:167)
          org.apache.drill.exec.record.AbstractSingleRecordBatch.innerNext(AbstractSingleRecordBatch.java:93)
          org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.innerNext(ProjectRecordBatch.java:132)
          org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:142)
          org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.next(IteratorValidatorBatchIterator.java:118)
          org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:67)
          org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.innerNext(ScreenCreator.java:97)
          org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:57)
          org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:114)
          org.apache.drill.exec.work.WorkManager$RunnableWrapper.run(WorkManager.java:254)
          java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
          java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
          java.lang.Thread.run(Thread.java:744)


Also, notice that the query result only contains one field; the second field is missing. 

The plan looks fine.

Drill Physical : 
00-00    Screen: rowcount = 463.0, cumulative cost = {1900.3 rows, 996.3 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 103
00-01      Project(employee_id=[$0], Employee_id=[$1]): rowcount = 463.0, cumulative cost = {1854.0 rows, 950.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 102
00-02        SelectionVectorRemover: rowcount = 463.0, cumulative cost = {1391.0 rows, 942.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 101
00-03          Limit(fetch=[2]): rowcount = 463.0, cumulative cost = {928.0 rows, 479.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 100
00-04            Project(employee_id=[$0], Employee_id=[$0]): rowcount = 463.0, cumulative cost = {926.0 rows, 471.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 99
00-05              Scan(groupscan=[EasyGroupScan [selectionRoot=/employee.json, numFiles=1, columns=[`employee_id`], files=[/employee.json]]]): rowcount = 463.0, cumulative cost = {463.0 rows, 463.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 98




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