http://postgresql.1045698.n5.nabble.com/BUG-5199-Window-frame-clause-wrong-behaviour-td2131492.html
tody I hit by this bug and can't find any doc about this, after google I find the bug 5199 reported 4 years ago. it is really nice to improve the error message or doc. Jov blog: http:amutu.com/blog <http://amutu.com/blog>
