Add Support For btree_gin Extension

[logston]

Is your feature request related to a problem? Please describe. It would be great to have support for the btree_gin extension.

Describe the solution you'd like Ability to enable the same behavior that is available in PostgreSQL under the extension of the same name.

Describe alternatives you've considered None at the moment. I'm simply showing interest in having this feature available.

Additional context

postgres=# CREATE EXTENSION IF NOT EXISTS btree_gin;
ERROR:  at or near "EOF": syntax error: unimplemented: this syntax
DETAIL:  source SQL:
CREATE EXTENSION IF NOT EXISTS btree_gin
                                        ^
HINT:  You have attempted to use a feature that is not yet implemented.

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Jira issue: CRDB-3993

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[ajwerner]

Can anybody say more about what value there'd be in adding this extension? We do support inverted indexes. My reading of the docs is that this extension is largely for testing inverted indexes.

[pquerna]

Can anybody say more about what value there'd be in adding this extension? We do support inverted indexes. My reading of the docs is that this extension is largely for testing inverted indexes.

We use btree_gin to support multi-column indexes, exactly in the pattern this blog post outlines:

https://pganalyze.com/blog/gin-index#multi-column-gin-indexes-and-combining-gin-and-b-tree-indexes

CREATE INDEX ON records USING gin (data, customer_id);

Basically we have a tenant/account/customer id which we include in every query, and we also have a JSONB or tsvector we're doing operations against.

[tyge68]

@ajwerner any update on this, does cockroach db support this extension now ?