How to use

getPredecessorNode

method

in

org.apache.flink.optimizer.dag.FlatMapNode

  /**
   * Computes the estimates for the FlatMap operator. Since it un-nests, we assume a cardinality
   * increase. To give the system a hint at data increase, we take a default magic number of a 5 times increase. 
   */
  @Override
  protected void computeOperatorSpecificDefaultEstimates(DataStatistics statistics) {
    this.estimatedNumRecords = getPredecessorNode().getEstimatedNumRecords() * 5;
  }
}

  /**
   * Computes the estimates for the FlatMap operator. Since it un-nests, we assume a cardinality
   * increase. To give the system a hint at data increase, we take a default magic number of a 5 times increase. 
   */
  @Override
  protected void computeOperatorSpecificDefaultEstimates(DataStatistics statistics) {
    this.estimatedNumRecords = getPredecessorNode().getEstimatedNumRecords() * 5;
  }
}

  /**
   * Computes the estimates for the FlatMap operator. Since it un-nests, we assume a cardinality
   * increase. To give the system a hint at data increase, we take a default magic number of a 5 times increase. 
   */
  @Override
  protected void computeOperatorSpecificDefaultEstimates(DataStatistics statistics) {
    this.estimatedNumRecords = getPredecessorNode().getEstimatedNumRecords() * 5;
  }
}

  /**
   * Computes the estimates for the FlatMap operator. Since it un-nests, we assume a cardinality
   * increase. To give the system a hint at data increase, we take a default magic number of a 5 times increase. 
   */
  @Override
  protected void computeOperatorSpecificDefaultEstimates(DataStatistics statistics) {
    this.estimatedNumRecords = getPredecessorNode().getEstimatedNumRecords() * 5;
  }
}

  /**
   * Computes the estimates for the FlatMap operator. Since it un-nests, we assume a cardinality
   * increase. To give the system a hint at data increase, we take a default magic number of a 5 times increase. 
   */
  @Override
  protected void computeOperatorSpecificDefaultEstimates(DataStatistics statistics) {
    this.estimatedNumRecords = getPredecessorNode().getEstimatedNumRecords() * 5;
  }
}