Package org.aksw.jena_sparql_api.algebra.transform

Class TransformDistributeJoinOverUnion

java.lang.Object
org.apache.jena.sparql.algebra.TransformCopy
org.aksw.jena_sparql_api.algebra.transform.TransformDistributeJoinOverUnion
All Implemented Interfaces:
org.apache.jena.sparql.algebra.Transform
public class TransformDistributeJoinOverUnion extends org.apache.jena.sparql.algebra.TransformCopy
Turn a join of unions into a union of joins. It is recommended to use this transformation with the triple-based (i.e. NOT the quad based) form and afterwards use another transform to merge BGPs: op = TransformDistributeJoinOverUnion.transform(op); op = Optimize.apply(new TransformMergeBGPs(), op); join(union(...), union(..)) -> union(join(...), join(...), ..., )
Author:
raven

  • Field Summary

    Fields inherited from class org.apache.jena.sparql.algebra.TransformCopy

    COPY_ALWAYS, COPY_ONLY_ON_CHANGE

  • Constructor Summary

    Constructors
    Constructor
    Description
    TransformDistributeJoinOverUnion()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static org.apache.jena.sparql.algebra.Op
    distribute(List<org.apache.jena.sparql.algebra.Op> as, List<org.apache.jena.sparql.algebra.Op> bs)
     
    static org.apache.jena.sparql.algebra.Op
    transform(org.apache.jena.sparql.algebra.Op op)
     
    org.apache.jena.sparql.algebra.Op
    transform(org.apache.jena.sparql.algebra.op.OpJoin opJoin, org.apache.jena.sparql.algebra.Op left, org.apache.jena.sparql.algebra.Op right)
     

    Methods inherited from class org.apache.jena.sparql.algebra.TransformCopy

    transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • TransformDistributeJoinOverUnion

      public TransformDistributeJoinOverUnion()

  • Method Details

    • transform

      public static org.apache.jena.sparql.algebra.Op transform(org.apache.jena.sparql.algebra.Op op)

    • transform

      public org.apache.jena.sparql.algebra.Op transform(org.apache.jena.sparql.algebra.op.OpJoin opJoin, org.apache.jena.sparql.algebra.Op left, org.apache.jena.sparql.algebra.Op right)
      Specified by:
      transform in interface org.apache.jena.sparql.algebra.Transform
      Overrides:
      transform in class org.apache.jena.sparql.algebra.TransformCopy

    • distribute

      public static org.apache.jena.sparql.algebra.Op distribute(List<org.apache.jena.sparql.algebra.Op> as, List<org.apache.jena.sparql.algebra.Op> bs)