[jira] [Created] (HIVE-18593) NPE on vectorization group by

["Amruth S (JIRA)" <ji...@apache.org>]

Amruth S created HIVE-18593:
-------------------------------

             Summary: NPE on vectorization group by
                 Key: HIVE-18593
                 URL: https://issues.apache.org/jira/browse/HIVE-18593
             Project: Hive
          Issue Type: Bug
          Components: Hive, HiveServer2
    Affects Versions: 2.3.2
            Reporter: Amruth S


Vectorisation with some queries seem to be failing with null pointer exceptions. This happens only with 2.3.2 release and not the older ones.

It seems in this method (BytesColumnVector.java, vector[0] is null, if the complete batch is null)
{code:java}
public void copySelected(
    boolean selectedInUse, int[] sel, int size, BytesColumnVector output) {

  // Output has nulls if and only if input has nulls.
  output.noNulls = noNulls;
  output.isRepeating = false;

  // Handle repeating case
  if (isRepeating) {
    output.setVal(0, vector[0], start[0], length[0]);
    output.isNull[0] = isNull[0];
    output.isRepeating = true;
    return;
  }
{code}
Exception trace below
{code:java}
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row
at org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator.process(VectorMapOperator.java:883)
at org.apache.hadoop.hive.ql.exec.tez.MapRecordSource.processRow(MapRecordSource.java:86)
... 17 more
Caused by: java.lang.NullPointerException
at java.lang.System.arraycopy(Native Method)
at org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector.setVal(BytesColumnVector.java:173)
at org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector.copySelected(BytesColumnVector.java:321)
at org.apache.hadoop.hive.ql.exec.vector.expressions.IfExprStringGroupColumnStringGroupColumn.evaluate(IfExprStringGroupColumnStringGroupColumn.java:85)
at org.apache.hadoop.hive.ql.exec.vector.expressions.aggregates.gen.VectorUDAFMaxString.aggregateInputSelection(VectorUDAFMaxString.java:135)
at org.apache.hadoop.hive.ql.exec.vector.VectorGroupByOperator$ProcessingModeBase.processAggregators(VectorGroupByOperator.java:218)
at org.apache.hadoop.hive.ql.exec.vector.VectorGroupByOperator$ProcessingModeHashAggregate.doProcessBatch(VectorGroupByOperator.java:408)
at org.apache.hadoop.hive.ql.exec.vector.VectorGroupByOperator$ProcessingModeBase.processBatch(VectorGroupByOperator.java:179)
at org.apache.hadoop.hive.ql.exec.vector.VectorGroupByOperator.process(VectorGroupByOperator.java:1021)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:897)
at org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator.process(VectorSelectOperator.java:137)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:897)
at org.apache.hadoop.hive.ql.exec.vector.VectorFilterOperator.process(VectorFilterOperator.java:123)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:897)
at org.apache.hadoop.hive.ql.exec.TableScanOperator.process(TableScanOperator.java:130)
at org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator.process(VectorMapOperator.java:783)
... 18 more
{code}
 



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