Examples of org.apache.hadoop.hbase.client.coprocessor.DoubleColumnInterpreter

Package org.apache.hadoop.hbase.client.coprocessor

Examples of org.apache.hadoop.hbase.client.coprocessor.DoubleColumnInterpreter

org.apache.hadoop.hbase.client.coprocessor.DoubleColumnInterpreter
a concrete column interpreter implementation. The cell value is a Double value and its promoted data type is also a Double value. For computing aggregation function, this class is used to find the datatype of the cell value. Client is supposed to instantiate it and passed along as a parameter. See TestDoubleColumnInterpreter methods for its sample usage. Its methods handle null arguments gracefully.

    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(ROWS[6]);
    scan.setStopRow(ROWS[2]);
    final ColumnInterpreter<Double, Double, EmptyMsg, DoubleMsg, DoubleMsg> ci = 
        new DoubleColumnInterpreter();
    Double sum = null;
    try {
      sum = aClient.sum(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
    }

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    Filter f = new PrefixFilter(Bytes.toBytes("foo:bar"));
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setFilter(f);
    final ColumnInterpreter<Double, Double, EmptyMsg, DoubleMsg, DoubleMsg> ci = 
        new DoubleColumnInterpreter();
    Double sum = null;
    sum = aClient.sum(TEST_TABLE, ci, scan);
    assertEquals(null, sum);
  }

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  public void testAvgWithValidRange() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    final ColumnInterpreter<Double, Double, EmptyMsg, DoubleMsg, DoubleMsg> ci = 
        new DoubleColumnInterpreter();
    double avg = aClient.avg(TEST_TABLE, ci, scan);
    assertEquals(9.5, avg, 0);
  }

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    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[15]);
    final ColumnInterpreter<Double, Double, EmptyMsg, DoubleMsg, DoubleMsg> ci =
        new DoubleColumnInterpreter();
    double avg = aClient.avg(TEST_TABLE, ci, scan);
    assertEquals(9.5, avg, 0);
  }

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  public void testAvgWithValidRangeWithNoCQ() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    final ColumnInterpreter<Double, Double, EmptyMsg, DoubleMsg, DoubleMsg> ci = 
        new DoubleColumnInterpreter();
    double avg = aClient.avg(TEST_TABLE, ci, scan);
    assertEquals(10.45, avg, 0.01);
  }

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    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(ROWS[6]);
    scan.setStopRow(ROWS[7]);
    final ColumnInterpreter<Double, Double, EmptyMsg, DoubleMsg, DoubleMsg> ci = 
        new DoubleColumnInterpreter();
    double avg = aClient.avg(TEST_TABLE, ci, scan);
    assertEquals(6 + 0.60, avg, 0);
  }

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Related Classes of org.apache.hadoop.hbase.client.coprocessor.DoubleColumnInterpreter

org.apache.hadoop.hbase.coprocessor.TestDoubleColumnInterpreter

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