Package se.liu.ida.hefquin.base.queryplan

Interface ExpectedVariables

public interface ExpectedVariables
Implementations of this interface represent sets of variables that can be expected in the solution mappings produced by query operators.

  • Method Summary

    Modifier and Type
    Method
    Description
    Set<org.apache.jena.sparql.core.Var>
    getCertainVariables()
    Returns the variables that are guaranteed to be bound in every solution mapping produced by the operator for which this ExpectedVariables object was created.
    Set<org.apache.jena.sparql.core.Var>
    getPossibleVariables()
    Returns the variables that may be bound in solution mappings produced by the operator for which this ExpectedVariables object was created, but that are not guaranteed to be bound in every such solution mapping.

  • Method Details

    • getCertainVariables

      Set<org.apache.jena.sparql.core.Var> getCertainVariables()
      Returns the variables that are guaranteed to be bound in every solution mapping produced by the operator for which this ExpectedVariables object was created.

    • getPossibleVariables

      Set<org.apache.jena.sparql.core.Var> getPossibleVariables()
      Returns the variables that may be bound in solution mappings produced by the operator for which this ExpectedVariables object was created, but that are not guaranteed to be bound in every such solution mapping.