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MDEV-21405 Assertion failed on instant ADD COLUMN
btr_cur_pessimistic_insert(): Relax a too strict debug assertion that would fail when the function is invoked by btr_cur_pessimistic_update() during innobase_add_instant_try(), that is, when updating the hidden metadata record during a subsequent ADD COLUMN operation involves splitting the leftmost clustered index leaf page. This is a partial backport of 301bd62 from 10.4.
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