Class Calc

    • Method Detail

      • copy

        public final Calc copy​(RelTraitSet traitSet,
                               java.util.List<RelNode> inputs)
        Description copied from interface: RelNode
        Creates a copy of this relational expression, perhaps changing traits and inputs.

        Sub-classes with other important attributes are encouraged to create variants of this method with more parameters.

        Specified by:
        copy in interface RelNode
        Overrides:
        copy in class AbstractRelNode
        Parameters:
        traitSet - Trait set
        inputs - Inputs
        Returns:
        Copy of this relational expression, substituting traits and inputs
      • isValid

        public boolean isValid​(Litmus litmus,
                               RelNode.Context context)
        Description copied from interface: RelNode
        Returns whether this relational expression is valid.

        If assertions are enabled, this method is typically called with litmus = THROW, as follows:

        assert rel.isValid(Litmus.THROW)

        This signals that the method can throw an AssertionError if it is not valid.

        Specified by:
        isValid in interface RelNode
        Overrides:
        isValid in class AbstractRelNode
        Parameters:
        litmus - What to do if invalid
        context - Context for validity checking
        Returns:
        Whether relational expression is valid
      • accept

        public RelNode accept​(RexShuttle shuttle)
        Description copied from interface: RelNode
        Accepts a visit from a shuttle. If the shuttle updates expression, then a copy of the relation should be created. This new relation might have a different row-type.
        Specified by:
        accept in interface RelNode
        Overrides:
        accept in class AbstractRelNode
        Parameters:
        shuttle - Shuttle
        Returns:
        A copy of this node incorporating changes made by the shuttle to this node's children