Module datarush.analytics
Package com.pervasive.datarush.analytics.stats

Class DistinctValues

    • Constructor Detail

      • DistinctValues

        public DistinctValues()
        Default constructor. Prior to graph compilation the following property must be set:

      • DistinctValues

        public DistinctValues​(String inputField)
        Computes distinct values for the given input field
        Parameters:
        inputField - the input field for which we calculate distinct values

    • Method Detail

      • getInputField

        public String getInputField()
        Returns the input field for which we calculate distinct values
        Returns:
        the input field for which we calculate distinct values

      • setInputField

        public void setInputField​(String inputField)
        Sets the input field for which we calculate distinct values
        Parameters:
        inputField - the input field for which we calculate distinct values

      • isSortByCount

        public boolean isSortByCount()
        Returns whether to sort by value count. This is false by default and thus output order is unspecified.
        Returns:
        whether to sort by value count

      • setSortByCount

        public void setSortByCount​(boolean sortByCount)
        Sets whether to sort by value count. This is false by default and thus output order is unspecified.
        Parameters:
        sortByCount - whether to sort by value count

      • isFewDistinctValuesHint

        public boolean isFewDistinctValuesHint()
        Returns a hint as to whether there are expected to be a small number of distinct values. If not, we eagerly sort up-front.
        Returns:
        whether few distinct values are expected

      • setFewDistinctValuesHint

        public void setFewDistinctValuesHint​(boolean fewDistinctValuesHint)
        Sets a hint as to whether there are expected to be a small number of distinct values. If not, we eagerly sort up-front.
        Parameters:
        fewDistinctValuesHint - whether few distinct values are expected

      • compose

        protected void compose​(CompositionContext ctx)
        Description copied from class: CompositeOperator
        Compose the body of this operator. Implementations should do the following:
        1. Perform any validation of configuration, input types, etc
        2. Instantiate and configure sub-operators, adding them to the provided context via the method OperatorComposable.add(O)
        3. Create necessary connections via the method OperatorComposable.connect(P, P). This includes connections from the composite's input ports to sub-operators, connections between sub-operators, and connections from sub-operators output ports to the composite's output ports
        Specified by:
        compose in class CompositeOperator
        Parameters:
        ctx - the context