[ https://issues.apache.org/jira/browse/HIVE-14082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15346777#comment-15346777 ]
Sahil Takiar edited comment on HIVE-14082 at 7/18/16 8:50 PM:
--------------------------------------------------------------
After a lot of investigation into these two errors, they seem to be slightly related.
The TL;DR is that I think there is a bug in the class {{ReduceSinkOperator}}, but I am not 100% sure.
I started debugging Exception 1 first. It seems that {{GenericUDFOPEqualOrGreaterThan}} tries to compare a {{Text}} object with value {{value_1_3}} to a {{DateWritable}} object with value {{2015-06-22}}. This happens inside the reduce method, and causes the code to throw a {{ClassCastException}} and fail.
I compared the query plans for Query 1 vs. Query 3 (the output of {{EXPLAIN ...}}). Both plans require a single Map-Reduce job. The major difference is that the Query 3 runs a Filter Operator in both the Map Task and the Reduce Task, while Query 1 only runs a Filter Operator in the Map Task. I suspect the Filter Operator in the Reduce Task of Query 3 is having some type of issue.
Here is the output of the {{EXPLAIN}} query:
{code}
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--+
| Explain |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--+
| STAGE DEPENDENCIES: |
| Stage-2 is a root stage |
| Stage-0 depends on stages: Stage-2 |
| Stage-3 depends on stages: Stage-0 |
| Stage-1 depends on stages: Stage-2 |
| Stage-4 depends on stages: Stage-1 |
| |
| STAGE PLANS: |
| Stage: Stage-2 |
| Map Reduce |
| Map Operator Tree: |
| TableScan |
| alias: multi_table_insert_source |
| Statistics: Num rows: 5 Data size: 250 Basic stats: COMPLETE Column stats: NONE |
| Filter Operator |
| predicate: ((date_column >= 2013-06-21) or (date_column >= 2015-06-22)) (type: boolean) |
| Statistics: Num rows: 2 Data size: 100 Basic stats: COMPLETE Column stats: NONE |
| Select Operator |
| expressions: column_1 (type: string), column_2 (type: string), column_3 (type: string), date_column (type: date) |
| outputColumnNames: column_1, column_2, column_3, date_column |
| Statistics: Num rows: 2 Data size: 100 Basic stats: COMPLETE Column stats: NONE |
| Reduce Output Operator |
| key expressions: column_1 (type: string), column_2 (type: string), column_3 (type: string), date_column (type: date) |
| sort order: ++++ |
| Map-reduce partition columns: column_1 (type: string), column_2 (type: string) |
| Statistics: Num rows: 2 Data size: 100 Basic stats: COMPLETE Column stats: NONE |
| Reduce Operator Tree: |
| Forward |
| Statistics: Num rows: 2 Data size: 100 Basic stats: COMPLETE Column stats: NONE |
| Filter Operator |
| predicate: (KEY._col2:1._col0 >= 2015-06-22) (type: boolean) |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| Group By Operator |
| aggregations: count(), count(DISTINCT KEY._col2:0._col0), count(DISTINCT KEY._col2:1._col0, KEY._col2:1._col1) |
| keys: KEY._col0 (type: string), KEY._col1 (type: string) |
| mode: complete |
| outputColumnNames: _col0, _col1, _col2, _col3, _col4 |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| Select Operator |
| expressions: _col0 (type: string), _col1 (type: string), UDFToInteger(_col2) (type: int), UDFToInteger(_col3) (type: int), UDFToInteger(_col4) (type: int) |
| outputColumnNames: _col0, _col1, _col2, _col3, _col4 |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| File Output Operator |
| compressed: false |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| table: |
| input format: org.apache.hadoop.mapred.TextInputFormat |
| output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
| serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
| name: multi_table_insert_bug.multi_table_insert_test |
| Filter Operator |
| predicate: (KEY._col2:1._col0 >= 2013-06-21) (type: boolean) |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| Group By Operator |
| aggregations: count(), count(DISTINCT KEY._col2:0._col0), count(DISTINCT KEY._col2:1._col0, KEY._col2:1._col1) |
| keys: KEY._col0 (type: string), KEY._col1 (type: string) |
| mode: complete |
| outputColumnNames: _col0, _col1, _col2, _col3, _col4 |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| Select Operator |
| expressions: _col0 (type: string), _col1 (type: string), UDFToInteger(_col2) (type: int), UDFToInteger(_col3) (type: int), UDFToInteger(_col4) (type: int) |
| outputColumnNames: _col0, _col1, _col2, _col3, _col4 |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| File Output Operator |
| compressed: false |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| table: |
| input format: org.apache.hadoop.mapred.TextInputFormat |
| output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
| serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
| name: multi_table_insert_bug.multi_table_insert_test |
| |
| Stage: Stage-0 |
| Move Operator |
| tables: |
| partition: |
| partition_column 365 |
| replace: true |
| table: |
| input format: org.apache.hadoop.mapred.TextInputFormat |
| output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
| serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
| name: multi_table_insert_bug.multi_table_insert_test |
| |
| Stage: Stage-3 |
| Stats-Aggr Operator |
| |
| Stage: Stage-1 |
| Move Operator |
| tables: |
| partition: |
| partition_column 1096 |
| replace: true |
| table: |
| input format: org.apache.hadoop.mapred.TextInputFormat |
| output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
| serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
| name: multi_table_insert_bug.multi_table_insert_test |
| |
| Stage: Stage-4 |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--+
| Explain |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--+
| Stats-Aggr Operator |
| |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--+
{code}
The {{ReduceSinkOperator}} class is emitting the record:
*Record 1:*
{code}
{"key":{"_col0":"value_1_1","_col1":"value_1_2","_col2":{0:{"_col0":"value_1_3"}}},"value":null}
{code}
Which does not contain the {{date_column}} column, causing the {{FilterOperator}} in the {{ExecReducer}} to fail.
Once I determined that {{ReduceSinkOperator}} is emitting this record, I did my best to trace through the logic of {{ReduceSinkOperator}} to figure out why it is emitting Record 1. The {{ReduceSinkOperator}} seems to emit a single record for each {{DISTINCT}} keyword in the query, but the record will only have a subset of its original columns. For each {{DISTINCT}} clause it will emit the columns in the {{DISTINCT}} clause itself, as well as the columns in the {{GROUP BY}}. For example, for {{COUNT(DISTINCT column_3)}} it will emit {{column_1}}, {{column_2}}, and {{column_3}}, but not the {{date_column}}. *I'm not sure the {{ReduceSinkOperator}} takes into account the situation where a {{FilterOperator}} can occur on the reduce-side of a Hive query, over a column not in the {{DISTINCT}} or {{GROUP BY}} clause.*
Exception 2 seems to be related to Exception 1. Exception 2 is thrown in the class {{OpProcFactory.ReduceSinkLineage.process(...)}} method. This method does some type of processing on the {{ReduceSinkOperator}} class (the same class mentioned above when analyzing Exception 1), so my guess is that they are related.
was (Author: stakiar):
After a lot of investigation into these two errors, they seem to be slightly related.
The TL;DR is that I think there is a bug in the class {{ReduceSinkOperator}}, but I am not 100% sure.
I started debugging Exception 1 first. It seems that {{GenericUDFOPEqualOrGreaterThan}} tries to compare a {{Text}} object with value {{value_1_3}} to a {{DateWritable}} object with value {{2015-06-22}}. This happens inside the reduce method, and causes the code to throw a {{ClassCastException}} and fail.
I compared the query plans for Query 1 vs. Query 3 (the output of {{EXPLAIN ...}}). Both plans require a single Map-Reduce job. The major difference is that the Query 3 runs a Filter Operator in both the Map Task and the Reduce Task, while Query 1 only runs a Filter Operator in the Map Task. I suspect the Filter Operator in the Reduce Task of Query 3 is having some type of issue.
Here is the output of the {{EXPLAIN}} query:
{code}
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--+
| Explain |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--+
| STAGE DEPENDENCIES: |
| Stage-2 is a root stage |
| Stage-0 depends on stages: Stage-2 |
| Stage-3 depends on stages: Stage-0 |
| Stage-1 depends on stages: Stage-2 |
| Stage-4 depends on stages: Stage-1 |
| |
| STAGE PLANS: |
| Stage: Stage-2 |
| Map Reduce |
| Map Operator Tree: |
| TableScan |
| alias: multi_table_insert_source |
| Statistics: Num rows: 5 Data size: 250 Basic stats: COMPLETE Column stats: NONE |
| Filter Operator |
| predicate: ((date_column >= 2013-06-21) or (date_column >= 2015-06-22)) (type: boolean) |
| Statistics: Num rows: 2 Data size: 100 Basic stats: COMPLETE Column stats: NONE |
| Select Operator |
| expressions: column_1 (type: string), column_2 (type: string), column_3 (type: string), date_column (type: date) |
| outputColumnNames: column_1, column_2, column_3, date_column |
| Statistics: Num rows: 2 Data size: 100 Basic stats: COMPLETE Column stats: NONE |
| Reduce Output Operator |
| key expressions: column_1 (type: string), column_2 (type: string), column_3 (type: string), date_column (type: date) |
| sort order: ++++ |
| Map-reduce partition columns: column_1 (type: string), column_2 (type: string) |
| Statistics: Num rows: 2 Data size: 100 Basic stats: COMPLETE Column stats: NONE |
| Reduce Operator Tree: |
| Forward |
| Statistics: Num rows: 2 Data size: 100 Basic stats: COMPLETE Column stats: NONE |
| Filter Operator |
| predicate: (KEY._col2:1._col0 >= 2015-06-22) (type: boolean) |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| Group By Operator |
| aggregations: count(), count(DISTINCT KEY._col2:0._col0), count(DISTINCT KEY._col2:1._col0, KEY._col2:1._col1) |
| keys: KEY._col0 (type: string), KEY._col1 (type: string) |
| mode: complete |
| outputColumnNames: _col0, _col1, _col2, _col3, _col4 |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| Select Operator |
| expressions: _col0 (type: string), _col1 (type: string), UDFToInteger(_col2) (type: int), UDFToInteger(_col3) (type: int), UDFToInteger(_col4) (type: int) |
| outputColumnNames: _col0, _col1, _col2, _col3, _col4 |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| File Output Operator |
| compressed: false |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| table: |
| input format: org.apache.hadoop.mapred.TextInputFormat |
| output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
| serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
| name: multi_table_insert_bug.multi_table_insert_test |
| Filter Operator |
| predicate: (KEY._col2:1._col0 >= 2013-06-21) (type: boolean) |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| Group By Operator |
| aggregations: count(), count(DISTINCT KEY._col2:0._col0), count(DISTINCT KEY._col2:1._col0, KEY._col2:1._col1) |
| keys: KEY._col0 (type: string), KEY._col1 (type: string) |
| mode: complete |
| outputColumnNames: _col0, _col1, _col2, _col3, _col4 |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| Select Operator |
| expressions: _col0 (type: string), _col1 (type: string), UDFToInteger(_col2) (type: int), UDFToInteger(_col3) (type: int), UDFToInteger(_col4) (type: int) |
| outputColumnNames: _col0, _col1, _col2, _col3, _col4 |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| File Output Operator |
| compressed: false |
| Statistics: Num rows: 1 Data size: 50 Basic stats: COMPLETE Column stats: NONE |
| table: |
| input format: org.apache.hadoop.mapred.TextInputFormat |
| output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
| serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
| name: multi_table_insert_bug.multi_table_insert_test |
| |
| Stage: Stage-0 |
| Move Operator |
| tables: |
| partition: |
| partition_column 365 |
| replace: true |
| table: |
| input format: org.apache.hadoop.mapred.TextInputFormat |
| output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
| serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
| name: multi_table_insert_bug.multi_table_insert_test |
| |
| Stage: Stage-3 |
| Stats-Aggr Operator |
| |
| Stage: Stage-1 |
| Move Operator |
| tables: |
| partition: |
| partition_column 1096 |
| replace: true |
| table: |
| input format: org.apache.hadoop.mapred.TextInputFormat |
| output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
| serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
| name: multi_table_insert_bug.multi_table_insert_test |
| |
| Stage: Stage-4 |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--+
| Explain |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--+
| Stats-Aggr Operator |
| |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--+
{code}
The {{ReduceSinkOperator}} class is emitting the record:
*Record 1:*
{code}
{"key":{"_col0":"value_1_1","_col1":"value_1_2","_col2":{0:{"_col0":"value_1_3"}}},"value":null}
{code}
Which does not contain the {{date_column}} column, causing the {{FilterOperator}} in the {{ExecReducer}} to fail.
Once I determined that {{ReduceSinkOperator}} is emitting this record, I did my best to trace through the logic of {{ReduceSinkOperator}} to figure out why it is emitting Record 1. The {{ReduceSinkOperator}} seems to emit a single record for each {{DISTINCT}} keyword in the query, but the record will only have a subset of its original columns. For each {{DISTINCT}} clause it will emit the columns in the {{DISTINCT}} clause itself, as well as the columns in the {{GROUP BY}}. For example, for {{COUNT(DISTINCT column_3)}} it will emit {{column_1}}, {{column_2}}, and {{column_3}}, but not the {{date_column}}. I'm not sure the {{ReduceSinkOperator}} takes into account the situation where a {{FilterOperator}} can occur on the reduce-side of a Hive query, over a column not in the {{DISTINCT}} or {{GROUP BY}} clause.
Exception 2 seems to be related to Exception 1. Exception 2 is thrown in the class {{OpProcFactory.ReduceSinkLineage.process(...)}} method. This method does some type of processing on the {{ReduceSinkOperator}} class (the same class mentioned above when analyzing Exception 1), so my guess is that they are related.
> Multi-Insert Query Fails with GROUP BY, DISTINCT, and WHERE clauses
> -------------------------------------------------------------------
>
> Key: HIVE-14082
> URL: https://issues.apache.org/jira/browse/HIVE-14082
> Project: Hive
> Issue Type: Bug
> Affects Versions: 1.1.0, 2.1.0
> Reporter: Sahil Takiar
> Assignee: Sahil Takiar
>
> The following MULTI-INSERT Query Fails in Hive. I've listed the query required to re-produce this failure, as well as a few similar queries that work properly.
> Setup Queries:
> {code}
> DROP SCHEMA IF EXISTS multi_table_insert_bug CASCADE;
> CREATE SCHEMA multi_table_insert_bug;
> USE multi_table_insert_bug;
> DROP TABLE IF EXISTS multi_table_insert_source;
> DROP TABLE IF EXISTS multi_table_insert_test;
> CREATE TABLE multi_table_insert_source (
> date_column DATE,
> column_1 STRING,
> column_2 STRING,
> column_3 STRING,
> column_4 STRING
> );
> CREATE TABLE multi_table_insert_test (
> column_1 STRING,
> column_2 STRING,
> line_count INT,
> distinct_count_by_1_column INT,
> distinct_count_by_2_columns INT
> )
> PARTITIONED BY (partition_column INT);
> INSERT OVERWRITE TABLE multi_table_insert_source VALUES
> ('2016-01-22', 'value_1_1', 'value_1_2', 'value_1_3', 'value_1_4'),
> ('2016-01-22', 'value_2_1', 'value_2_2', 'value_2_3', 'value_2_4'),
> ('2016-01-22', 'value_3_1', 'value_3_2', 'value_3_3', 'value_3_4'),
> ('2016-01-22', 'value_4_1', 'value_4_2', 'value_4_3', 'value_4_4'),
> ('2016-01-22', 'value_5_1', 'value_5_2', 'value_5_3', 'value_5_4');
> {code}
> The following queries run successfully:
> *Query 1:*
> {code}
> FROM multi_table_insert_source
> INSERT OVERWRITE TABLE multi_table_insert_test PARTITION (partition_column = 365)
> SELECT
> column_1,
> column_2,
> COUNT(*) AS line_count,
> COUNT(DISTINCT column_3) AS distinct_count_by_1_column,
> COUNT(DISTINCT date_column, column_3) AS distinct_count_by_2_columns
> WHERE date_column >= DATE_SUB(FROM_UNIXTIME(UNIX_TIMESTAMP()), 365)
> GROUP BY
> column_1,
> column_2;
> {code}
> *Query 2:*
> {code}
> FROM multi_table_insert_source
> INSERT OVERWRITE TABLE multi_table_insert_test PARTITION (partition_column = 365)
> SELECT
> column_1,
> column_2,
> COUNT(*) AS line_count,
> COUNT(DISTINCT column_3) AS distinct_count_by_1_column,
> COUNT(DISTINCT date_column, column_3) AS distinct_count_by_2_columns
> -- WHERE date_column >= DATE_SUB(FROM_UNIXTIME(UNIX_TIMESTAMP()), 365)
> GROUP BY
> column_1,
> column_2
> INSERT OVERWRITE TABLE multi_table_insert_test PARTITION (partition_column = 1096)
> SELECT
> column_1,
> column_2,
> COUNT(*) AS line_count,
> COUNT(DISTINCT column_3) AS distinct_count_by_1_column,
> COUNT(DISTINCT date_column, column_3) AS distinct_count_by_2_columns
> -- WHERE date_column >= DATE_SUB(FROM_UNIXTIME(UNIX_TIMESTAMP()), 1096)
> GROUP BY
> column_1,
> column_2;
> {code}
> The following query fails with a {{ClassCastException}}:
> *Query 3:*
> {code}
> FROM multi_table_insert_source
> INSERT OVERWRITE TABLE multi_table_insert_test PARTITION (partition_column = 365)
> SELECT
> column_1,
> column_2,
> COUNT(*) AS line_count,
> COUNT(DISTINCT column_3) AS distinct_count_by_1_column,
> COUNT(DISTINCT date_column, column_3) AS distinct_count_by_2_columns
> WHERE date_column >= DATE_SUB(FROM_UNIXTIME(UNIX_TIMESTAMP()), 365)
> GROUP BY
> column_1,
> column_2
> INSERT OVERWRITE TABLE multi_table_insert_test PARTITION (partition_column = 1096)
> SELECT
> column_1,
> column_2,
> COUNT(*) AS line_count,
> COUNT(DISTINCT column_3) AS distinct_count_by_1_column,
> COUNT(DISTINCT date_column, column_3) AS distinct_count_by_2_columns
> WHERE date_column >= DATE_SUB(FROM_UNIXTIME(UNIX_TIMESTAMP()), 1096)
> GROUP BY
> column_1,
> column_2;
> {code}
> Here is the full stack-trace of the exception:
> *Exception 1:*
> {code}
> java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row (tag=0) {"key":{"_col0":"value_1_1","_col1":"value_1_2","_col2":{0:{"_col0":"value_1_3"}}},"value":null}
> at org.apache.hadoop.hive.ql.exec.mr.ExecReducer.reduce(ExecReducer.java:257)
> at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:506)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:447)
> at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:449)
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row (tag=0) {"key":{"_col0":"value_1_1","_col1":"value_1_2","_col2":{0:{"_col0":"value_1_3"}}},"value":null}
> at org.apache.hadoop.hive.ql.exec.mr.ExecReducer.reduce(ExecReducer.java:245)
> ... 3 more
> Caused by: java.lang.ClassCastException: org.apache.hadoop.io.Text cannot be cast to org.apache.hadoop.hive.serde2.io.DateWritable
> at org.apache.hadoop.hive.serde2.objectinspector.primitive.WritableDateObjectInspector.getPrimitiveWritableObject(WritableDateObjectInspector.java:38)
> at org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.compare(ObjectInspectorUtils.java:938)
> at org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.compare(ObjectInspectorUtils.java:818)
> at org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.compare(ObjectInspectorUtils.java:809)
> at org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPEqualOrGreaterThan.evaluate(GenericUDFOPEqualOrGreaterThan.java:141)
> at org.apache.hadoop.hive.ql.exec.ExprNodeGenericFuncEvaluator._evaluate(ExprNodeGenericFuncEvaluator.java:186)
> at org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator.evaluate(ExprNodeEvaluator.java:77)
> at org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator.evaluate(ExprNodeEvaluator.java:65)
> at org.apache.hadoop.hive.ql.exec.FilterOperator.process(FilterOperator.java:112)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:878)
> at org.apache.hadoop.hive.ql.exec.ForwardOperator.process(ForwardOperator.java:38)
> at org.apache.hadoop.hive.ql.exec.mr.ExecReducer.reduce(ExecReducer.java:236)
> ... 3 more
> {code}
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