On 3/22/11 8:11 PM, "Ruslan Zasukhin" <[email protected]>
wrote:
IF to remove ^ ( "union" | "except" )^
query_expression
: query_term (( "union" | "except" ) "all"? query_term)*
-> ^(QUERY_EXPRESSION $query_expression)
then all looks correct, but tree is empty from $query_expression
TREE: (SQL_STATEMENT QUERY_EXPRESSION)
But it should looks as
TREE: (SQL_STATEMENT (QUERY_EXPRESSION (select (SELECT_LIST
(SELECT_ELEM_LIST ) (from (NON_JOIN_TABLE t1)))))
> On 3/20/11 1:11 PM, "Matt Fowles" <[email protected]> wrote:
>
> Hi Matt,
>
>> Ruslan,
>
>> Try:
>>
>> query_expression
>> : query_term (( "union" | "except" )^ "all"? query_term)*
>> -> ^(QUERY_EXPRESSION $query_expression)
>> ;
>
> Well, $ not helps. Still same
> error 165 uses rewrite syntax and also an ast operator
>
> As I understand,
> -> is re-write syntax
> ^ is AST operator ...
>
>
>
>> Matt
>>
>> On Sun, Mar 20, 2011 at 10:40 AM, Ruslan Zasukhin
>> <[email protected]> wrote:
>>> Hi All,
>>>
>>> In v2 grammar we have rule as
>>>
>>> ===========================================
>>> query_expression
>>> : query_term (( "union"^ | "except"^ ) ( "all" )? query_term)*
>>> { ## = #([QUERY_EXPRESSION,"QUERY_EXPRESSION"], ##); }
>>> ;
>>> ===========================================
>>>
>>>
>>> We try change it to v3
>>>
>>> ===========================================
>>> query_expression
>>> : query_term (( "union"^ | "except"^ ) ( "all" )? query_term)*
>>> ->(QUERY_EXPRESSION ???? )
>>> ;
>>> ===========================================
>>>
>>> Ops, we cannot specify top node, because it can be union OR except.
>>>
>>>
>>> For now the only way we have found is:
>>> ===========================================
>>> query_expression
>>> : query_expression2 ->(QUERY_EXPRESSION query_expression2)
>>> ;
>>>
>>>
>>> query_expression2
>>> : query_term (( "union"^ | "except"^ ) ( "all" )? query_term)*
>>> ;
>>> ===========================================
>>>
>>>
>>>
>>> Question is. May be exists more elegant way for v3
>>> Without additional rule?
>
--
Best regards,
Ruslan Zasukhin
VP Engineering and New Technology
Paradigma Software, Inc
Valentina - Joining Worlds of Information
http://www.paradigmasoft.com
[I feel the need: the need for speed]
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