Github user jeremy-coulon commented on a diff in the pull request:

    https://github.com/apache/jena/pull/394#discussion_r181407237
  
    --- Diff: 
jena-arq/src/main/java/org/apache/jena/sparql/algebra/OpWalker.java ---
    @@ -139,6 +139,7 @@ protected void visitN(OpN op) {
             @Override
             protected void visitExt(OpExt op) {
                 before(op) ;
    +            super.visitExt(op);
    --- End diff --
    
    Visiting the real OpExt is not useful for me but I can't say for other 
people.


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