Class SortExchange

  • All Implemented Interfaces:
    java.lang.Cloneable, RelOptNode, RelNode
    Direct Known Subclasses:

    public abstract class SortExchange
    extends Exchange
    Relational expression that performs Exchange and Sort simultaneously.

    Whereas a Sort produces output with a particular RelCollation and an Exchange produces output with a particular RelDistribution, the output of a SortExchange has both the required collation and distribution.

    Several implementations of SortExchange are possible; the purpose of this base class allows rules to be written that apply to all of those implementations.