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Bruce Momjian wrote:
> Trevor Talbot wrote:
>> 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.
>
> Yes, so you create a function called complex_ts and create the index:
>
> CREATE INDEX ii on x USING GIT(complex_ts(col1, col2))
GIN?
>
> and in your WHERE clause you do:
>
> WHERE 'a & b' @@ complex_ts(col1, col2)
>
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