toInteger() return result changed

[foesa-yang]

In Nebula Graph version v2.5.0, toInteger("1e3") result is NULL, as follows:

(root@nebula) [basketballplayer]> RETURN toInteger(1), toInteger('1'), toInteger('1e3'), toInteger('not a number');
+--------------+----------------+------------------+---------------------------+
| toInteger(1) | toInteger("1") | toInteger("1e3") | toInteger("not a number") |
+--------------+----------------+------------------+---------------------------+
| 1            | 1              | __NULL__         | __NULL__                  |
+--------------+----------------+------------------+---------------------------+

But in Nebula Graph version v2.0.1 the result is the follows:

(root@nebula) [basketballplayer]> RETURN toInteger(1), toInteger('1'), toInteger('1e3'), toInteger('not a number');
+--------------+----------------+------------------+---------------------------+
| toInteger(1) | toInteger("1") | toInteger("1e3") | toInteger("not a number") |
+--------------+----------------+------------------+---------------------------+
| 1            | 1              | 1000             | __NULL__                  |
+--------------+----------------+------------------+---------------------------+

[Aiee]

Fixed in vesoft-inc/nebula-common#609