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We haven't done this up to now because there was only one use-case, namely plpgsql_free_function_memory's search for expressions to clean up. However an upcoming patch has another need for walking plpgsql functions' statement trees, so let's create sharable tree-walker infrastructure in the same style as expression_tree_walker(). This patch actually makes the code shorter, although that's mainly down to having used a more compact coding style. (I didn't write a separate subroutine for each statement type, and I made use of some newer notations like foreach_ptr.) Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru> Reviewed-by: Pavel Borisov <pashkin.elfe@gmail.com> Discussion: https://postgr.es/m/CACxu=vJaKFNsYxooSnW1wEgsAO5u_v1XYBacfVJ14wgJV_PYeg@mail.gmail.com |
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