MDEV-38327 Do not use rowid filter when switching to index merge #4541
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factor out common index merge checks of quick select types
…hod is index merge Index merge and rowid filter should not be used together, however, even if index merge is not chosen earlier in best_access_path, it may be chosen again in make_join_select, inside ref_to_range. Therefore this patch ensures that rowid filter is not used when index merge is chosen there.
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Index merge and rowid filter should not be used together, however, even if index merge is not chosen earlier in best_access_path, it may be chosen again in make_join_select. Therefore this patch ensures that rowid filter is not used when index merge is chosen in make_join_select.