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  1. Hive
  2. HIVE-9502

Parquet cannot read Map types from files written with Hive <= 0.12

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.14.0
    • Fix Version/s: 1.1.0
    • Component/s: None
    • Labels:
      None

      Description

      When reading a Parquet file written by Hive <= 0.12, the following error is thrown:

      Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
              at org.apache.hadoop.hive.ql.io.parquet.serde.AbstractParquetMapInspector.getMap(AbstractParquetMapInspector.java:73)
              at org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serialize(LazySimpleSerDe.java:519)
              at org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serializeField(LazySimpleSerDe.java:443)
              at org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serialize(LazySimpleSerDe.java:427)
              at org.apache.hadoop.hive.ql.exec.FileSinkOperator.processOp(FileSinkOperator.java:582)
              at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:796)
              at org.apache.hadoop.hive.ql.exec.LimitOperator.processOp(LimitOperator.java:51)
              at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:796)
              at org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:87)
              at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:796)
              at org.apache.hadoop.hive.ql.exec.TableScanOperator.processOp(TableScanOperator.java:92)
              at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:796)
              at org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:539)
              ... 9 more
      

      This is because old versions of Hive (<= 0.12) write Map types using the following schema:

      optional group m1 (MAP_KEY_VALUE) {
      	repeated group map {
      		required binary key;
      		optional binary key;
      	}
      }	
      

      PARQUET-113 mentions new annotations for Parquet nested types.
      https://github.com/rdblue/incubator-parquet-format/blob/PARQUET-113-add-list-and-map-spec/LogicalTypes.md#maps

      And now the correct schema is:

      optional group m1f (MAP) {
      	repeated group map (MAP_KEY_VALUE) {
      		required binary key;
      		optional binary key;
      	}
      }
      

      We should be backwards compatible to the old schema as well.

        Attachments

        1. HIVE-9502.4.patch
          4 kB
          Sergio Peña
        2. HIVE-9502.3.patch
          5 kB
          Sergio Peña
        3. alltypesparquet
          1 kB
          Sergio Peña
        4. HIVE-9502.2.patch
          4 kB
          Sergio Peña
        5. HIVE-9502.1.patch
          0.9 kB
          Sergio Peña

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              • Assignee:
                spena Sergio Peña
                Reporter:
                spena Sergio Peña
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                Dates

                • Created:
                  Updated:
                  Resolved: