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Remove unnecessary unused MATCH PARTIAL code

ri_triggers.c spends a lot of space catering to a not-yet-implemented MATCH PARTIAL option. An actual implementation would probably not use the existing code structure anyway, so let's just simplify this for now. First, have ri_FetchConstraintInfo() check that riinfo->confmatchtype is valid. Then we don't have to repeat that everywhere. In the various referential action functions, we don't need to pay attention to the match type at all right now, so remove all that code. A future MATCH PARTIAL implementation would probably have some conditions added to the present code, but it won't need an entirely separate switch branch in each case. In RI_FKey_fk_upd_check_required(), reorganize the code to make it much simpler. Reviewed-by: Corey Huinker <corey.huinker@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/0ccdd3e1-10b0-dd05-d8a7-183507c11eb1%402ndquadrant.com

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src/backend/utils/adt
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