Does anyone know the logic of limit statement execution in Clickhouse? In the picture, the SQL above can be executed successfully

Does anyone know clickhouse in limit Statement execution logic , In the picture , above SQL Can be executed successfully , But the rate of reading data is slow 200Mb/s, At the bottom of the sql Execution failed , newspaper Memory limit (for query) exceeded, Not enough memory , But the data read rate is fast , stay 4Gb/s.

---