--! qt:dataset:src1
CREATE TABLE dest1_n167(c1 DOUBLE, c2 INT) STORED AS TEXTFILE;

EXPLAIN
FROM src1
INSERT OVERWRITE TABLE dest1_n167 SELECT NULL, src1.key;

FROM src1
INSERT OVERWRITE TABLE dest1_n167 SELECT NULL, src1.key;

SELECT dest1_n167.* FROM dest1_n167;