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SELECT @@MAX_JOIN_SIZE, @@SQL_BIG_SELECTS;
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insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
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SELECT * from t1 order by a;
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SELECT * from t1 order by a;
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SET MAX_JOIN_SIZE=DEFAULT;