Fix DELETE/UPDATE FOR PORTION OF with rules

Peter Eisentraut <peter@eisentraut.org>

Commit: 33db6c4baf17e0fdf2ac08f7d050155985c0d7e3
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2026-04-27T08:34:06Z
Fix DELETE/UPDATE FOR PORTION OF with rules

Previously, these test cases would give internal errors or crash.  The
fix is to add some missing fields of ForPortionOfExpr to
expression_tree_walker.

Author: jian he <jian.universality@gmail.com>
Reviewed-by: Kirill Reshke <reshkekirill@gmail.com>
Reviewed-by: Paul A Jungwirth <pj@illuminatedcomputing.com>
Discussion: https://postgr.es/m/CACJufxHs1Hs00EqsZ4NbuAjmYzMzjJyP1sAj12Ne=cBsEVmQOA@mail.gmail.com

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