On 8/18/07, Bruce Momjian <bruce@momjian.us> wrote:
> Remember an expression index can be a user-created function so you can
> embed whatever you want in your function and just index it's output,
> just like you would with a trigger creating a separate column.
Well, you could create a function that returns a tsvector, but how do
you get that to work with queries? I've been under the impression the
expressions need to match (in the normal case, be the same function
with the same arguments) in order to use the index.