Examples of org.apache.derby.iapi.sql.execute.ExecAggregator.merge()

Package org.apache.derby.iapi.sql.execute

Class org.apache.derby.iapi.sql.execute.ExecAggregator

Examples of org.apache.derby.iapi.sql.execute.ExecAggregator.merge()

org.apache.derby.iapi.sql.execute.ExecAggregator.merge()
Merges one aggregator into a another aggregator. Merges two partial aggregates results into a single result. Needed for:
- parallel aggregation
- vector aggregation (GROUP BY)
- distinct aggregates (e.g. MAX(DISTINCT Col))
An example of a merge would be: given two COUNT() aggregators, C1 and C2, a merge of C1 into C2 would set C1.count += C2.count. So, given a CountAggregator with a getCount() method that returns its counts, its merge method might look like this:
```
 public void merge(ExecAggregator inputAggregator) throws StandardException {    count += ((CountAccgregator)inputAggregator).getCount(); } 
```
@param inputAggregator the other Aggregator (input partial aggregate) @exception StandardException on error

      }
    }
    uaIn = (ExecAggregator)(((UserDataValue) aggregatorColumnIn).getObject());
    uaOut = (ExecAggregator)(((UserDataValue) aggregatorColumnOut).getObject());


    uaOut.merge(uaIn);
  }


  //////////////////////////////////////////////////////
  //
  // MISC

View Full Code Here

      }
    }
    uaIn = (ExecAggregator)(((UserDataValue) aggregatorColumnIn).getObject());
    uaOut = (ExecAggregator)(((UserDataValue) aggregatorColumnOut).getObject());


    uaOut.merge(uaIn);
  }


  //////////////////////////////////////////////////////
  //
  // MISC

View Full Code Here

      }
    }
    uaIn = (ExecAggregator)(((UserDataValue) aggregatorColumnIn).getObject());
    uaOut = (ExecAggregator)(((UserDataValue) aggregatorColumnOut).getObject());


    uaOut.merge(uaIn);
  }


  //////////////////////////////////////////////////////
  //
  // MISC

View Full Code Here

      }
    }
    uaIn = (ExecAggregator)(((UserDataValue) aggregatorColumnIn).getObject());
    uaOut = (ExecAggregator)(((UserDataValue) aggregatorColumnOut).getObject());


    uaOut.merge(uaIn);
  }


  //////////////////////////////////////////////////////
  //
  // MISC

View Full Code Here

      }
    }
    uaIn = (ExecAggregator)(((UserDataValue) aggregatorColumnIn).getObject());
    uaOut = (ExecAggregator)(((UserDataValue) aggregatorColumnOut).getObject());


    uaOut.merge(uaIn);
  }


  //////////////////////////////////////////////////////
  //
  // MISC

View Full Code Here

      }
    }
    uaIn = (ExecAggregator)(((UserDataValue) aggregatorColumnIn).getObject());
    uaOut = (ExecAggregator)(((UserDataValue) aggregatorColumnOut).getObject());


    uaOut.merge(uaIn);
  }


  //////////////////////////////////////////////////////
  //
  // MISC

View Full Code Here

      }
    }
    uaIn = (ExecAggregator)(((UserDataValue) aggregatorColumnIn).getObject());
    uaOut = (ExecAggregator)(((UserDataValue) aggregatorColumnOut).getObject());


    uaOut.merge(uaIn);
  }


  //////////////////////////////////////////////////////
  //
  // MISC

View Full Code Here

      }
    }
    uaIn = (ExecAggregator)(((UserDataValue) aggregatorColumnIn).getObject());
    uaOut = (ExecAggregator)(((UserDataValue) aggregatorColumnOut).getObject());


    uaOut.merge(uaIn);
  }


  //////////////////////////////////////////////////////
  //
  // MISC

View Full Code Here

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