我有兩個Postgres的hstore基於表,entity和info,這兩者看起來是這樣: Column | Type | Modifiers
------------+--------------------------+---------------------------------------------------------------
id | integ
http://www.postgresql.org/docs/9.2/static/hstore.html狀態: hstore has GiST and GIN index support for the @>, ?, ?& and ?| operators
然而,指數don't work for the EXIST function,這似乎是等同於?運營商。 運算符和函數之間的區別是什麼使索