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After merge fixes
Added initialization of all important global variables
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@@ -84,7 +84,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a,b a 5 NULL 5 Using where
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explain select * from t1 where (a is null or a = 7) and b=7 and c=0;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a,b a 5 NULL 12 Using where
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1 SIMPLE t1 ALL a,b NULL NULL NULL 12 Using where
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explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a,b a 5 const 3 Using where
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