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create table t1 (a int, b int default (a+1)); insert t1 values (1,10), (2,20), (3,30); connect con1, localhost, root; select a,b,default(b) from t1; a b default(b) 1 10 2 2 20 3 3 30 4 set debug_sync='after_Item_default_value_calculate WAIT_FOR go'; select a,b,default(b) from t1; connection default; set debug_sync='ha_write_row_start SIGNAL go'; insert t1 values (100,default(b)); connection con1; a b default(b) 1 10 2 2 20 3 3 30 4 connection default; drop table t1; set debug_sync='RESET';