Hive
  1. Hive
  2. HIVE-2329

Not using map aggregation, fails to execute group-by after cluster-by with same key

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Minor Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.9.0
    • Component/s: Query Processor
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      hive.map.aggr=false
      select Q1.key_int1, sum(Q1.key_int1), sum(distinct Q1.key_int1) from (select * from t1 cluster by key_int1) Q1 group by Q1.key_int1

      resulted..

      FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.MapRedTask

      from hadoop logs..

      Caused by: java.lang.RuntimeException: cannot find field key from []
      at org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.getStandardStructFieldRef(ObjectInspectorUtils.java:321)
      at org.apache.hadoop.hive.serde2.objectinspector.StandardStructObjectInspector.getStructFieldRef(StandardStructObjectInspector.java:119)
      at org.apache.hadoop.hive.ql.exec.ExprNodeColumnEvaluator.initialize(ExprNodeColumnEvaluator.java:82)
      at org.apache.hadoop.hive.ql.exec.GroupByOperator.initializeOp(GroupByOperator.java:198)
      at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:357)
      at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:433)
      ........

      I think the problem is caused by ReduceSinkDeDuplication, removing RS which was providing rs.key for GBY operation. If child of child RS is a GBY, we should bypass the optimization.

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            • Assignee:
              Navis
              Reporter:
              Navis
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              Dates

              • Created:
                Updated:
                Resolved:

                Development