Package org.cqframework.cql.elm.execution

Class Distinct

  • All Implemented Interfaces:
    org.jvnet.jaxb2_commons.lang.Equals2, org.jvnet.jaxb2_commons.lang.HashCode2, org.jvnet.jaxb2_commons.lang.ToString2
    Direct Known Subclasses:
    DistinctEvaluator
    public class Distinct
extends UnaryExpression
implements org.jvnet.jaxb2_commons.lang.Equals2, org.jvnet.jaxb2_commons.lang.HashCode2, org.jvnet.jaxb2_commons.lang.ToString2
    The Distinct operator takes a list of elements and returns a list containing only the unique elements within the input. For example, given the list of integers { 1, 1, 1, 2, 2, 3, 4, 4 }, the result of Distinct would be { 1, 2, 3, 4 }. The operator uses equality comparison semantics as defined in the Equal operator, with the exception that nulls are considered equal for the purposes of distinct determination. This means that multiple nulls in the input will result in a single null in the output. If the source argument is null, the result is null.

    Java class for Distinct complex type.

    The following schema fragment specifies the expected content contained within this class. 

     <complexType name="Distinct">
   <complexContent>
     <extension base="{urn:hl7-org:elm:r1}UnaryExpression">
     </extension>
   </complexContent>
 </complexType>