写入多个Sink语句时，需要以BEGIN STATEMENT SET;开头，以END;结尾。

--源表
CREATE TEMPORARY TABLE datagen_source (
  name VARCHAR,
  score BIGINT
) WITH (
  'connector' = 'datagen'
);

--结果表A
CREATE TEMPORARY TABLE blackhole_sinkA(
  name VARCHAR,
  score BIGINT
) WITH (
  'connector' = 'blackhole' 
);

--结果表B
CREATE TEMPORARY TABLE blackhole_sinkB(
  name VARCHAR,
  score BIGINT
) WITH (
  'connector' = 'blackhole' 
);

--DML
BEGIN STATEMENT SET;      --写入多个Sink时，必填。
INSERT INTO blackhole_sinkA 
  SELECT UPPER(name), sum(score) 
  FROM datagen_source 
  GROUP BY UPPER(name);
INSERT INTO blackhole_sinkB 
  SELECT LOWER(name), max(score) 
  FROM datagen_source 
  GROUP BY LOWER(name);
END;      --写入多个Sink时，必填。