●▲● **`newType cast(oldType expr as newType)`** -- 基础类型之间强制转换 ```sql hive> select cast('1' as DOUBLE) from test; 1.0 ``` ●▲● `binary binary(string|binary)` -- 将 string 类型转换为二进制 ```sql hive> select binary('charels') from test; charels ```