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From "zhihai xu (JIRA)" <>
Subject [jira] [Created] (HIVE-16368) Unexpected java.lang.ArrayIndexOutOfBoundsException from query with LaterView Operation for hive on MR.
Date Tue, 04 Apr 2017 01:20:41 GMT
zhihai xu created HIVE-16368:

             Summary: Unexpected java.lang.ArrayIndexOutOfBoundsException from query with
LaterView Operation for hive on MR.
                 Key: HIVE-16368
             Project: Hive
          Issue Type: Bug
          Components: Query Planning
            Reporter: zhihai xu
            Assignee: zhihai xu

Unexpected java.lang.ArrayIndexOutOfBoundsException from query. It happened in LaterView Operation.
It happened for hive-on-mr. The reason is because the column prune change the column order
in LaterView operation, for back-back reducesink operators using MR engine, FileSinkOperator
and TableScanOperator are added before the second ReduceSink operator, The serialization column
order used by FileSinkOperator in LazyBinarySerDe of previous reducer is different from deserialization
column order from table desc used by MapOperator/TableScanOperator in LazyBinarySerDe of current
failed mapper.
The serialization is decided by the outputObjInspector from LateralViewJoinOperator,
    ArrayList<String> fieldNames = conf.getOutputInternalColNames();
    outputObjInspector = ObjectInspectorFactory
        .getStandardStructObjectInspector(fieldNames, ois);
So the column order for serialization is decided by getOutputInternalColNames in LateralViewJoinOperator.

The deserialization is decided by TableScanOperator which is created at  GenMapRedUtils.splitTasks.

    TableDesc tt_desc = PlanUtils.getIntermediateFileTableDesc(PlanUtils
        .getFieldSchemasFromRowSchema(parent.getSchema(), "temporarycol"));
    // Create the temporary file, its corresponding FileSinkOperaotr, and
    // its corresponding TableScanOperator.
    TableScanOperator tableScanOp =
        createTemporaryFile(parent, op, taskTmpDir, tt_desc, parseCtx);
The column order for deserialization is decided by rowSchema of LateralViewJoinOperator.
But ColumnPrunerLateralViewJoinProc changed the order of outputInternalColNames but still
keep the original order of rowSchema,
Which cause the mismatch between serialization and deserialization for two back-to-back MR
Similar issue for ColumnPrunerLateralViewForwardProc which change the column order of its
child selector colList but not rowSchema.

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