MDEV-38327 Do not use rowid filter when switching to index merge #4541
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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.
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| In the function sub_select() just before the first access of a join | ||
| table s employing a range filter | ||
| The method JOIN_TAB::build_range_rowid_filter_if_needed() is called | ||
| The method JOIN_TAB::build_range_rowid_filter() is called |
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Can split cleanups like this to a separate commit if needed.
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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.