Neil Conway <[EMAIL PROTECTED]> writes:
> I wouldn't call this behavior buggy, but I found it somewhat surprising.
> expression_tree_walker() assumes that the walker has already been
> invoked on the current node (the node that a given recursive call of
> expression_tree_walker() has been invoked on). Therefore, calling
> expression_tree_walker() on a primitive node type, such as a Var, is a
> no-op.
The documented usage method is to call the walker itself at the top
level of recursion. The walker calls expression_tree_walker (after
doing its thing on the node); other code should not call
expression_tree_walker directly.
regards, tom lane
---------------------------(end of broadcast)---------------------------
TIP 1: if posting/reading through Usenet, please send an appropriate
subscribe-nomail command to [EMAIL PROTECTED] so that your
message can get through to the mailing list cleanly
