Christian,
Thanks for the idea. Just tried it... new with any expr list, including
subqueries are parsed. The AST came out a little funny at first, but I fixed
that using a new 'CONSTRUCTOR' node type (first sub-node is the class,
subsequent nodes are the argument list).
input: ->select new Foo(count(bar)) from bar<-
AST : ( query ( select ( ( Foo ( count bar ) ) ) ( from bar ) )
\-'query' [QUERY]
+-'select' [LITERAL_select]
| \-'(' [CONSTRUCTOR]
| +-'Foo' [IDENT]
| \-'count' [LITERAL_count]
| \-'bar' [IDENT]
\-'from' [LITERAL_from]
\-'bar' [IDENT]
input: ->select new Foo(count(bar),(select count(*) from doofus d where
d.gob = 'fat' )) from bar<-
AST : ( query ( select ( ( Foo ( count bar ) ( ( ( select ( count * ) ) (
from doofus ( as d ) ) ( where ( = ( . d gob ) 'fat' ) ) ) ) ) ( from bar )
)
\-'query' [QUERY]
+-'select' [LITERAL_select]
| \-'(' [CONSTRUCTOR]
| +-'Foo' [IDENT]
| +-'count' [LITERAL_count]
| | \-'bar' [IDENT]
| \-'(' [OPEN]
| +-'select' [LITERAL_select]
| | \-'count' [LITERAL_count]
| | \-'*' [STAR]
| +-'from' [LITERAL_from]
| | +-'doofus' [IDENT]
| | \-'as' [ALIAS]
| | \-'d' [IDENT]
| \-'where' [LITERAL_where]
| \-'=' [EQ]
| +-'.' [DOT]
| | +-'d' [IDENT]
| | \-'gob' [IDENT]
| \-''fat'' [QUOTED_STRING]
\-'from' [LITERAL_from]
\-'bar' [IDENT]
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Christian Bauer
> Sent: Monday, November 17, 2003 8:17 AM
> To: hibernate list
> Subject: Re: [Hibernate] Re: AST parser for HQL
>
>
> On 18 Nov (00:05), Gavin King wrote:
>
> > Does the parser handle:
> >
> > * subselects (can't notice one anywhere)
> > * floating point and decimal literals
> > (it doesn't need to parse them, just recognize them)
>
> I'd also plan for "select new Foo(count(bar))".
>
> > This is the "implicit group by" we discussed in Aarhus, where
> > Hibernate
> > guesses what columns it needs to group by.
>
> Ah yes. I've read some more about this and we are right, the
> SQL "expert group" is wrong.
>
> --
> Christian Bauer
> [EMAIL PROTECTED]
>
>
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