Float results get truncated

[theodesp]

I'm trying to implement #392 and I noticed that the float64 results get truncated as integers.

I've also tested via another function AVG and that is also happening. For example:

Mysql-8

mysql> select avg(23.222);
+-------------+
| avg(23.222) |
+-------------+
|  23.2220000 |
+-------------+
1 row in set (0.01 sec)

go-mysql-server

mysql> select avg(23.222);
+-------------+
| AVG(23.222) |
+-------------+
|          23 |
+-------------+
1 row in set (0.00 sec)

Until that is solved some issues cannot go forward

[theodesp]

Cool I will continue with the #392