[jira] [Created] (HIVE-6389) LazyBinaryColumnarSerDe-based RCFile tables break when looking up elements in null-maps.

["Mithun Radhakrishnan (JIRA)" <ji...@apache.org>]

Mithun Radhakrishnan created HIVE-6389:
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             Summary: LazyBinaryColumnarSerDe-based RCFile tables break when looking up elements in null-maps.
                 Key: HIVE-6389
                 URL: https://issues.apache.org/jira/browse/HIVE-6389
             Project: Hive
          Issue Type: Bug
          Components: Serializers/Deserializers
    Affects Versions: 0.12.0, 0.11.0, 0.10.0, 0.13.0
            Reporter: Mithun Radhakrishnan
            Assignee: Mithun Radhakrishnan


RCFile tables that use the LazyBinaryColumnarSerDe don't seem to handle look-ups into map-columns when the value of the column is null.

When an RCFile table is created with LazyBinaryColumnarSerDe (as is default in 0.12), and queried as follows:

{code}
select mymap['1024'] from mytable;
{code}

and if the mymap column has nulls, then one is treated to the following guttural utterance:

{code}
2014-02-05 21:50:25,050 FATAL mr.ExecMapper (ExecMapper.java:map(194)) - org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row {"id":null,"mymap":null,"isnull":null}
  at org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:534)
  at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:177)
  at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
  at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:429)
  at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
  at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:235)
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
  at java.util.concurrent.FutureTask.run(FutureTask.java:262)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
  at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to org.apache.hadoop.io.Text
  at org.apache.hadoop.hive.serde2.objectinspector.primitive.WritableStringObjectInspector.getPrimitiveWritableObject(WritableStringObjectInspector.java:41)
  at org.apache.hadoop.hive.serde2.lazy.LazyUtils.writePrimitiveUTF8(LazyUtils.java:226)
  at org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serialize(LazySimpleSerDe.java:486)
  at org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serializeField(LazySimpleSerDe.java:439)
  at org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serialize(LazySimpleSerDe.java:423)
  at org.apache.hadoop.hive.ql.exec.FileSinkOperator.processOp(FileSinkOperator.java:560)
  at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:790)
  at org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:87)
  at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:790)
  at org.apache.hadoop.hive.ql.exec.TableScanOperator.processOp(TableScanOperator.java:92)
  at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:790)
  at org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:524)
  ... 10 more
{code}

A patch is on the way, but the short of it is that the LazyBinaryMapOI needs to return nulls if either the map or the lookup-key is null.

This is handled correctly for Text data, and for RCFiles using ColumnarSerDe.



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