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4e9d9a2470
Currently we have some usages of LIMIT where the actual limit counter is initialized next to the DecrJumpZero instruction, and then `program.mark_last_insn_constant()` is used to hoist the counter initialization to the beginning of the program. This is very fragile, and already FROM clause subquery handling works around this with a hack (removed in this PR), and (upcoming) WHERE clause subqueries would also run into problems because of this, because the LIMIT might need to be initialized once for every iteration of the subquery. This PR removes those usages for LIMIT, and LIMIT processing is now more intuitive: - limit counter is now initialized at the start of the query processing - a function init_limit() is extracted to do this for select/update/delete