Examples of cascading.tuple.Fields.subtract()

cascading.tuple.Fields.subtract()
Method subtract returns the difference between this instance and the given fields instance.
See {@link #append(Fields)} for adding field names. @param fields of type Fields @return Fields

    Fields fields = resolveIncomingOperationArgumentFields( getFirst( incomingScopes ) );


    if( fields.isUnknown() )
      return fields;


    return fields.subtract( argumentFields );
    }


  public abstract Scope outgoingScopeFor( Set<Scope> incomingScopes );


  void verifyDeclaredFields( Fields declared )

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    Fields incomingFields = resolveIncomingOperationPassThroughFields( incomingScope );


    // not part of resolve as we need the argumentFields
    if( outputSelector.isSwap() )
      return Fields.asDeclaration( incomingFields.subtract( argumentFields ) ).append( declaredFields );


    try
      {
      return Fields.resolve( outputSelector, Fields.asDeclaration( incomingFields ), declaredFields );
      }

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