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

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

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

org.apache.hadoop.hbase.client.coprocessor.LongColumnInterpreter
a concrete column interpreter implementation. The cell value is a Long value and its promoted data type is also a Long 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 TestAggregateProtocol methods for its sample usage. Its methods handle null arguments gracefully.

                        scan, Bytes.toBytes(field.getName()));
          return Bytes.toBytes(sum == null ? 0 : sum.intValue());
        }
        case INT64: {
          Long sum = aggregationClient
                    .sum(Bytes.toBytes(tableName), new LongColumnInterpreter(),
                        scan, Bytes.toBytes(field.getName()));
          return Bytes.toBytes(sum == null ? 0 : sum.longValue());
        }
        case FLOAT: {
          Float sum = aggregationClient

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    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[15]);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    long min = aClient.min(TEST_TABLE, ci, scan);
    assertEquals(5, min);
  }

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    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(HConstants.EMPTY_START_ROW);
    scan.setStopRow(HConstants.EMPTY_END_ROW);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    long min = aClient.min(TEST_TABLE, ci,
        scan);
    assertEquals(0, min);
  }

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    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(ROWS[6]);
    scan.setStopRow(ROWS[7]);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    long min = aClient.min(TEST_TABLE, ci, scan);
    assertEquals(6, min);
  }

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  public void testMinWithValidRangeWithNullCF() {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[15]);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    Long min = null;
    try {
      min = aClient.min(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
    }

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    Long min = null;
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(ROWS[4]);
    scan.setStopRow(ROWS[2]);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    try {
      min = aClient.min(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
    }
    assertEquals(null, min);// control should go to the catch block

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    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(ROWS[6]);
    scan.setStopRow(ROWS[6]);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    Long min = null;
    try {
      min = aClient.min(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
    }

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    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    Filter f = new PrefixFilter(Bytes.toBytes("foo:bar"));
    scan.setFilter(f);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    Long min = null;
    min = aClient.min(TEST_TABLE, ci, scan);
    assertEquals(null, min);
  }

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  @Test
  public void testSumWithValidRange() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY,TEST_QUALIFIER);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    long sum = aClient.sum(TEST_TABLE, ci,
        scan);
    assertEquals(190, sum);
  }

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    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY,TEST_QUALIFIER);
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[15]);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    long sum = aClient.sum(TEST_TABLE, ci, scan);
    assertEquals(95, sum);
  }

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