sql rainbow tables

I thought of a brilliant QA plan. Create sql rainbow tables! Just trust me, this system of QA will be very powerful in bug finding. Especially important will be the comparison of old/new versions of mysql. Writing a prototype now, on my day off.

Just during prototype development, I've discovered a handful of bugs. I'm testing all functions that are documented in the manual. This is alot that I've written up:

mysql> select count(*),category from func group by category;
+----------+--------------+
| count(*) | category     |
+----------+--------------+
|        6 | arithmetic   |
|        7 | bit          |
|       60 | casting      |
|       47 | comparison   |
|       52 | datetime     |
|       18 | encryption   |
|      127 | geometry     |
|       17 | information  |
|        7 | logical      |
|       32 | mathematical |
|        9 | misc         |
|       47 | string       |
|        2 | xml          |
+----------+--------------+
13 rows in set (0.00 sec)

Let me explain this rainbow tables concept with a simple example.
Suppose we have a function, like "GREATEST()".

I run a query like this:

SELECT GREATEST(col1,col2,col3) FROM table0;

The columns col1,col2,col3 will form any combination of column type. So we have int, date, string, blob, spatial! Given a combination of all datatypes and all function parameters, it leaves us with a good few million queries. Of course, a few million queries is not so much for a machine to execute quickly..