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MDEV-30218: Incorrect optimization for rowid_filtering, correction
Enable use of Rowid Filter optimization with eq_ref access. Use the following assumptions: - Assume index-only access cost is 50% of non-index-only access cost. - Take into account that "Eq_ref access cache" reduces the number of lookups eq_ref access will make. = This means the number of Rowid Filter checks is reduced also = Eq_ref access cost is computed using that assumption (see prev_record_reads() call), so we should use it in all cost ' computations.
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