Jimmy Huang <jimmy_huang(at)live(dot)com> writes:
> I tried pg_trgm and my own customized token parser https://github.com/huangjimmy/pg_cjk_parser
pg_trgm is going to be fairly useless for indexing text that's mostly
multibyte characters, since its unit of indexable data is just 3 bytes
(not characters). I don't know of any comparable issue in the core
tsvector logic, though. The numbers you're quoting do sound quite awful,
but I share Cory's suspicion that it's something about your setup rather
than an inherent Postgres issue.
regards, tom lane