[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3082) JPQL constructor_expression followed by an aggregate_expression in select_clause not supported

[Bob Tiernay (JIRA)]

JPQL constructor_expression followed by an aggregate_expression in select_clause not supported
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                 Key: HHH-3082
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3082
             Project: Hibernate3
          Issue Type: Bug
          Components: core
    Affects Versions: 3.2.5
            Reporter: Bob Tiernay


>From the JPA spec:

select_statement ::= select_clause from_clause [where_clause] [groupby_clause] [having_clause] [orderby_clause] 
select_clause ::= SELECT [DISTINCT] select_expression {, select_expression}* 
select_expression ::= single_valued_path_expression | aggregate_expression | identification_variable | OBJECT(identification_variable)| constructor_expression 
constructor_expression ::= NEW constructor_name( constructor_item {, constructor_item}*) 

Expanding the production rules confirms that select_clause should support both a constructor_expression and an aggregate_expression in sequence. For example:

SELECT NEW package.DTO(e.f), COUNT(e) FROM Entity e WHERE ...

However, doing so indicates a grammar error in the "," prior to the aggregate expression.


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