Method records in hive that disagree with the same name as a function in MySQL

The Max function is an aggregate function in hive, so the return value is double and must be followed by the group by, which differs greatly from MySQL

Built-in Aggregate Functions (UDAF)

DOUBLE
Max (COL)
Returns the maximum value of the column in the group.

In MySQL

Returns the maximum value of expr. MAX () may take a string argument; Inch
Such cases, it returns the maximum string value. See
Http://dev.mysql.com/doc/refman/5.1/en/mysql-indexes.html. The DISTINCT
Keyword can used to find the maximum of the distinct values of expr,
However, this produces the same result as omitting DISTINCT.

MAX () returns NULL if there were no matching rows.

Method records in hive that disagree with the same name as a function in MySQL