zabetak commented on a change in pull request #1020: [CALCITE-2812] Add 
algebraic operators to allow expressing recursive queries (Ruben Quesada Lopez)
URL: https://github.com/apache/calcite/pull/1020#discussion_r255021963
 
 

 ##########
 File path: 
core/src/main/java/org/apache/calcite/jdbc/CalciteConnectionImpl.java
 ##########
 @@ -420,6 +421,7 @@ public CalciteServerStatement 
getStatement(Meta.StatementHandle h)
           .put(Variable.TIME_ZONE.camelName, timeZone)
           .put(Variable.STDIN.camelName, streamHolder.get()[0])
           .put(Variable.STDOUT.camelName, streamHolder.get()[1])
+          .put("#DELTA#", new LinkedList<>()) // TODO rql cleaner way?
 
 Review comment:
   Thanks @rubenada! I like the new approach. Let's see what @vlsi , and 
@hsyuan have to say about this.

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