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Oleg Smirnov authored
BNL() hint effectively increases join_cache_level up to 4 if it is set to value less than 4. This commit also makes the BKA() hint override not only `join_cache_bka` optimizer switch but `join_cache_level` as well. I.e., BKA() hint enables BKA and BKAH join buffers both flat and incremental despite `join_cache_level` and `join_cache_bka` setting.
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