text for fulltext search

[swuecho]

tsvector chinese support is not included by default.

currently, only use the simple config.

one possible walkaround is create tsvector in golang (using custom parser).

[swuecho]

select uuid, title, ts_rank(text_vector, websearch_to_tsquery('test'), 1) as rank
from chat_snapshot
where text_vector @@ websearch_to_tsquery('test')
order by rank desc
LIMIT 20