Hi Andres,
Thanks for your reply.
> I think we'd need a separation between the function to start initiating a tree
> walk/mutation and the function called for every recursion level. Then we can
> do the CFI() in the "start a tree walk" function, without having to do it the
> expression_tree_walker_impl(), once per processed node.
It looks like query_or_expression_tree_walker_impl and
query_or_expression_tree_mutator_impl actually have this property of
only being called when starting a tree walk. Perhaps it's OK to add the
check for interrupts at the start of these two functions? I can create a
patch for this if this is an acceptable approach.
-Floris
