Exponential notation
Apache Cassandra supports exponential notation.
CREATE TABLE test(
  id varchar PRIMARY KEY,
  value_double double,
  value_float float
);
INSERT INTO test (id, value_float, value_double)
  VALUES ('test1', -2.6034345E+38, -2.6034345E+38);
SELECT * FROM test;
 id    | value_double | value_float
-------+--------------+-------------
 test1 |  -2.6034e+38 | -2.6034e+38