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In an XMLTABLE expression, columns can be marked NOT NULL, and the parser internally fabricates an option named "is_not_null" to represent this. However, the parser also allows users to specify arbitrary option names. This creates a conflict: a user can explicitly use "is_not_null" as an option name and assign it a non-Boolean value, which violates internal assumptions and triggers an assertion failure. To fix, this patch checks whether a user-supplied name collides with the internally reserved option name and raises an error if so. Additionally, the internal name is renamed to "__pg__is_not_null" to further reduce the risk of collision with user-defined names. Reported-by: Евгений Горбанев <gorbanyoves@basealt.ru> Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Alvaro Herrera <alvherre@kurilemu.de> Discussion: https://postgr.es/m/6bac9886-65bf-4cec-96bd-e304159f28db@basealt.ru Backpatch-through: 15