[ 
https://issues.apache.org/jira/browse/DRILL-2385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15368194#comment-15368194
 ] 

Chun Chang commented on DRILL-2385:
-----------------------------------

Verified fix with:

{noformat}
0: jdbc:drill:schema=dfs.drillTestDir> select * from sys.version;
+-----------------+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------+----------------------------+---------------------+----------------------------+
|     version     |                 commit_id                 |                 
                                commit_message                                  
                |        commit_time         |     build_email     |         
build_time         |
+-----------------+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------+----------------------------+---------------------+----------------------------+
| 1.8.0-SNAPSHOT  | 05c42eae79ce3e309028b3824f9449b98e329f29  | DRILL-4707: Fix 
memory leak or incorrect query result in case two column names are 
case-insensitive identical.  | 29.06.2016 @ 08:15:13 PDT  | inram...@gmail.com  
| 07.07.2016 @ 10:50:40 PDT  |
+-----------------+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------+----------------------------+---------------------+----------------------------+
1 row selected (0.44 seconds)

0: jdbc:drill:schema=dfs.drillTestDir> use dfs.drillTestDirComplexJson;
+-------+----------------------------------------------------------+
|  ok   |                         summary                          |
+-------+----------------------------------------------------------+
| true  | Default schema changed to [dfs.drillTestDirComplexJson]  |
+-------+----------------------------------------------------------+
1 row selected (0.478 seconds)
0: jdbc:drill:schema=dfs.drillTestDir> select t.sia from `complex.json` t limit 
1;
+------------------+
|       sia        |
+------------------+
| [1,11,101,1001]  |
+------------------+
1 row selected (0.363 seconds)
0: jdbc:drill:schema=dfs.drillTestDir> select t.gbyi, count(t.sia) countsia 
from `complex.json` t group by t.gbyi;
+-------+-----------+
| gbyi  | countsia  |
+-------+-----------+
| 1     | 6667      |
| 2     | 6667      |
| 3     | 6667      |
| 4     | 6667      |
| 5     | 6667      |
| 6     | 6667      |
| 7     | 6667      |
| 8     | 6667      |
| 9     | 6667      |
| 10    | 6667      |
| 11    | 6666      |
| 12    | 6666      |
| 13    | 6666      |
| 14    | 6666      |
| 15    | 6666      |
+-------+-----------+
15 rows selected (1.693 seconds)
{noformat}

> count on complex objects failed with missing function implementation
> --------------------------------------------------------------------
>
>                 Key: DRILL-2385
>                 URL: https://issues.apache.org/jira/browse/DRILL-2385
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Functions - Drill
>    Affects Versions: 0.8.0
>            Reporter: Chun Chang
>            Assignee: Vitalii Diravka
>            Priority: Minor
>             Fix For: 1.7.0
>
>
> #Wed Mar 04 01:23:42 EST 2015
> git.commit.id.abbrev=71b6bfe
> Have a complex type looks like the following:
> {code}
> 0: jdbc:drill:schema=dfs.drillTestDirComplexJ> select t.sia from 
> `complex.json` t limit 1;
> +------------+
> |    sia     |
> +------------+
> | [1,11,101,1001] |
> +------------+
> {code}
> A count on the complex type will fail with missing function implementation:
> {code}
> 0: jdbc:drill:schema=dfs.drillTestDirComplexJ> select t.gbyi, count(t.sia) 
> countsia from `complex.json` t group by t.gbyi;
> Query failed: RemoteRpcException: Failure while running fragment., Schema is 
> currently null.  You must call buildSchema(SelectionVectorMode) before this 
> container can return a schema. [ 12856530-3133-45be-bdf4-ef8cc784f7b3 on 
> qa-node119.qa.lab:31010 ]
> [ 12856530-3133-45be-bdf4-ef8cc784f7b3 on qa-node119.qa.lab:31010 ]
> Error: exception while executing query: Failure while executing query. 
> (state=,code=0)
> {code}
> drillbit.log
> {code}
> 2015-03-04 13:44:51,383 [2b08832b-9247-e90c-785d-751f02fc1548:frag:2:0] ERROR 
> o.a.drill.exec.ops.FragmentContext - Fragment Context received failure.
> org.apache.drill.exec.exception.SchemaChangeException: Failure while 
> materializing expression.
> Error in expression at index 0.  Error: Missing function implementation: 
> [count(BIGINT-REPEATED)].  Full expression: null.
>         at 
> org.apache.drill.exec.physical.impl.aggregate.HashAggBatch.createAggregatorInternal(HashAggBatch.java:210)
>  [drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.physical.impl.aggregate.HashAggBatch.createAggregator(HashAggBatch.java:158)
>  [drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.physical.impl.aggregate.HashAggBatch.buildSchema(HashAggBatch.java:101)
>  [drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:130)
>  [drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.next(IteratorValidatorBatchIterator.java:118)
>  [drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:67) 
> [drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.physical.impl.partitionsender.PartitionSenderRootExec.innerNext(PartitionSenderRootExec.java:114)
>  [drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:57) 
> [drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:121)
>  [drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.work.WorkManager$RunnableWrapper.run(WorkManager.java:303)
>  [drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>  [na:1.7.0_45]
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>  [na:1.7.0_45]
>         at java.lang.Thread.run(Thread.java:744) [na:1.7.0_45]
> 2015-03-04 13:44:51,383 [2b08832b-9247-e90c-785d-751f02fc1548:frag:2:0] WARN  
> o.a.d.e.w.fragment.FragmentExecutor - Error while initializing or executing 
> fragment
> java.lang.NullPointerException: Schema is currently null.  You must call 
> buildSchema(SelectionVectorMode) before this container can return a schema.
>         at 
> com.google.common.base.Preconditions.checkNotNull(Preconditions.java:208) 
> ~[guava-14.0.1.jar:na]
>         at 
> org.apache.drill.exec.record.VectorContainer.getSchema(VectorContainer.java:261)
>  ~[drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.record.AbstractRecordBatch.getSchema(AbstractRecordBatch.java:155)
>  ~[drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.getSchema(IteratorValidatorBatchIterator.java:75)
>  ~[drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.physical.impl.partitionsender.PartitionSenderRootExec.sendEmptyBatch(PartitionSenderRootExec.java:276)
>  ~[drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.physical.impl.partitionsender.PartitionSenderRootExec.innerNext(PartitionSenderRootExec.java:131)
>  ~[drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:57) 
> ~[drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:121)
>  ~[drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> org.apache.drill.exec.work.WorkManager$RunnableWrapper.run(WorkManager.java:303)
>  [drill-java-exec-0.8.0-SNAPSHOT-rebuffed.jar:0.8.0-SNAPSHOT]
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>  [na:1.7.0_45]
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>  [na:1.7.0_45]
>         at java.lang.Thread.run(Thread.java:744) [na:1.7.0_45]
> {code}
> physical plan:
> {code}
> 0: jdbc:drill:schema=dfs.drillTestDirComplexJ> explain plan for select 
> t.gbyi, count(t.sia) countsia from `complex.json` t group by t.gbyi;
> +------------+------------+
> |    text    |    json    |
> +------------+------------+
> | 00-00    Screen
> 00-01      Project(gbyi=[$0], countsia=[$1])
> 00-02        UnionExchange
> 01-01          HashAgg(group=[{0}], countsia=[$SUM0($1)])
> 01-02            HashToRandomExchange(dist0=[[$0]])
> 02-01              HashAgg(group=[{0}], countsia=[COUNT($1)])
> 02-02                Project(gbyi=[$1], sia=[$0])
> 02-03                  Scan(groupscan=[EasyGroupScan 
> [selectionRoot=/drill/testdata/complex_type/json/complex.json, numFiles=1, 
> columns=[`gbyi`, `sia`], 
> files=[maprfs:/drill/testdata/complex_type/json/complex.json]]])
> {code}



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