On Sunday, May 05, 2013 1:03 PM soroosh sardari wrote:
> Hi > I'm trying to add a new constraint to column constraint. > I add a new keyword ro kwlist.h and gram.y, and also edit ColConstraintElem. > The problem is i don't know what is "Keyword category lists" at the end of gram.y.
Keyword category lists are to distinguish different type of keywords. For example, if you add keyword in reserved_keyword, then you cannot use that as variable in SQL where as if you put in unreserved_keyword, then you can use it.
> when I added the new keyword in "unreserved_keyword", shift/reduce and reduce/reduce conflicts appear in bison outputs. > any idea about this problem and meaning of "Keyword category lists" is appreciated.
This means the grammar syntax you have defined for ColConstraintElem conflicts with some already existing definition. shift/reduce conflicts can occur due to your changes in ColConstraintElem definition. I suggest first you can try with minimal/dummy changes in ColConstraintElem and once it passes then you can try with your actual changes to see what part of changes cause conflicts.