> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Gavin King
> Sent: Thursday, November 20, 2003 12:15 PM
> To: Joshua Davis
> Cc: 'hibernate-devel'
> Subject: Re: [Hibernate] AST grammar for HQL
>
> I suggest we use a mock Queryable, so that we can test this stuff w/o
> Hibernate. Its good TDD approach, I think.
Oh, maybe I misunderstood... do you mean something like Queryable? I was
looking at the real Queryable, and it's failry large and has many
dependencies.
> > * Should I add SQL-99 functions to the grammar?
>
> Aaahhhh I think we should worry about that a bit later on,
> personally.
> Lets get the basics right first. We can evolve the grammar easily
> enough, right?
Right. Will do. I'm just in 'grammar mode' right now.
> > Others have mentioned adding SQL-99 functions to the
> grammar and using
> > them to portably translate into the proper dialect. Since
> some of the
> > SQL-99 functions have their own (IMHO, weird and
> unnecessary) syntax,
> > they must be added to the grammar. For example:
> > concatentate : "CONCATENATE" '(' expression ( '||'
> expression )* ')'
>
> Yeah this is silly. I think we should just support "foo || bar", like
> most databases.
The string concatenation operator '||' is already in the grammar. :)
> count(distinct foo) is also a wierd one.
Yeah, SQL is kinda fubar, grammatically speaking.
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