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MDEV-20109: Optimizer ignores distinct key created for materialized...
(Backported to 10.3, addressed review input) Sj_materialization_picker::check_qep(): fix error in cost/fanout calculations: - for each join prefix, add #prefix_rows / TIME_FOR_COMPARE to the cost, like best_extension_by_limited_search does - Remove the fanout produced by the subquery tables. - Also take into account join condition selectivity optimize_wo_join_buffering() (used by LooseScan and FirstMatch) - also add #prefix_rows / TIME_FOR_COMPARE to the cost of each prefix. - Also take into account join condition selectivity
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