Fix count distinct on path with hql reserved words

Author: bahusoid

src/NHibernate/Hql/Ast/ANTLR/Hql.g

@@ -600,7 +600,7 @@ vectorExpr
 // NOTE: handleDotIdent() is called immediately after the first IDENT is recognized because
 // the method looks a head to find keywords after DOT and turns them into identifiers.
 identPrimary
-	: identifier { HandleDotIdent(); }
+	: identifier {{ HandleDotIdent(); }}
 			( options {greedy=true;} : DOT^ ( identifier | o=OBJECT { $o.Type = IDENT; } ) )*
 			( ( op=OPEN^ { $op.Type = METHOD_CALL;} exprList CLOSE! )
 			)?