HIVE alter table 语句结构：
CREATE TABLE test (
creatingTs BIGINT,
a STRING, b BIGINT, c STRING, d STRING, e BIGINT,f BIGINT
);如果需要删除 column f 列，可以使用以下语句：
ALTER TABLE test REPLACE COLUMNS (
creatingTs BIGINT,
a STRING, b BIGINT, c STRING, d STRING, e BIGINT );