Passing in parameters causes decimals to be returned as strings.

conn = mariadb.connect(**config)
cur = conn.cursor()
query = "select round(.75 * (? / 3), 2) as val"
cur.execute(query,[5])
print(result)

1. returns ('1.25',)

conn = mariadb.connect(**config)
cur = conn.cursor()
query = "select round(.75 * (6 / 3), 2) as val"
cur.execute(query)
print(result)

1. returns (Decimal('1.50'),)