When "FROM" multiple tables, the result will be different if the order is different?

[roychen11232357]

Hi there, I have 2 sqls:

SELECT aa FROM 
(SELECT bb FROM bbb  group by bb) as a, `omg`

Key	Value(s)
Table names	bbb
Column names	aa bb omg
Subqueries names	a

SELECT aa FROM 
`omg`, (SELECT bb FROM bbb  group by bb) as a

Key	Value(s)
Table names	omg bbb
Column names	aa bb
Column aliases	a

I thought the parsing results of the above two sqls would be the same, but they are actually different.

Anyone have any ideas, not sure if this is a issue?