Re: Is it possible to create an index without keeping the indexed data in a column?

larrry wrote
> Hi,
>
> I would like to create a GIN index on a set of JSON documents. Right now
> I'm storing the data in a JSONB column. The current index looks like this:
>
> CREATE INDEX document_payload_idx
> ON document
> USING gin
> (payload jsonb_path_ops);
>
> The index is pretty small, but the actual data takes up a *lot* of space.
> Is there a way to get Postgres to index the table *as if* the JSON were
> there, but not actually put the data in the table? I could either store
> the
> docs elsewhere and keep a reference, or compress them and put them in the
> table in compressed form as a blob.
>
> Thanks much for your help.
>
> Larry

No idea if this works but maybe you can store the compressed data and then
write the index expression like:

USING gin (unzip(payload) jsonb_path_ops)

The unzip function would need to be custom I think...

David J.

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