Re: like/ilike improvements

Tom Lane wrote:
> There should somewhere be a block comment explaining all the reasoning
> we've so painfully gone through about why the three cases (SB, MB, UTF8)
> are needed and how they must differ.
>
>             
>   

I'm working on a detailed description/rationale.

However, I have just about convinced myself that we don't need 
IsFirstByte for matching "_" for UTF8, either preceded by "%" or not, as 
it should always be true. Can anyone come up with a counter example? I 
don't mind keeping it and using it in Assert() though.

cheers

andrew