Because that's a syntax check, which does NOT evaluate any of the
expressions, only the types of them. Even if it will not be executed
ever, it is still wrong, and it should generate an error, because it
means a mistake on your side which potentially could leave to results
you didn't expect if executed as is. If it would not generate error in these cases, you would scream when you
by mistake write a wrong query and it doesn't give you the right errors.
Say thanks to the parser that it catches your errors and doesn't let you
do detective work to find out why your queries are not working as you
expect them to work.
Maybe you are right. Thanks.
Cheers, Csaba.
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