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Since this function is defined to accept pg_node_tree values, it could get applied to any nodetree that can appear in a cataloged pg_node_tree column. Some such cases can't be supported --- for example, its API doesn't allow providing referents for more than one relation --- but we should try to throw a user-facing error rather than an internal error when encountering such a case. In support of this, extend expression_tree_walker/mutator to be sure they'll work on any such node tree (which basically means adding support for relpartbound node types). That allows us to run pull_varnos and check for the case of multiple relations before we start processing the tree. The alternative of changing the low-level error thrown for an out-of-range varno isn't appealing, because that could mask actual bugs in other usages of ruleutils. Per report from Justin Pryzby. This is basically cosmetic, so no back-patch. Discussion: https://postgr.es/m/20211219205422.GT17618@telsasoft.com
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