List of selectivity() Examples

Examples of selectivity()

org.apache.derby.iapi.sql.compile.OptimizablePredicate.selectivity()
Get a (crude) estimate of the selectivity of this predicate. This is to be used when no better technique is available for estimating the selectivity - this method's estimate is a hard- wired number based on the type of predicate and the datatype (the selectivity of boolean is always 50%). @param optTable The Optimizable that this predicate restricts

Examples of org.apache.derby.iapi.sql.compile.OptimizablePredicate.selectivity()

    double selectivity = 1.0;


    for (int i = 0; i < size(); i++)
    {
      OptimizablePredicate pred = (OptimizablePredicate)elementAt(i);
      selectivity *= pred.selectivity((Optimizable)optTable);
    }
    
    return selectivity;
  }

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