(For decisive answers, read the postgres code ;))

And to be sure, please use like '%ab%' again.

I can't get bigrams to respond quickly; also not when there is only one matching value; with this data it will always Seq scan (sometimes with parallel workers: just under 1 second).

In postgres, 'LIKE' doesn't allow regex (although its simple pattern search can sometimes use the trigram or btree index). Postgres uses the tilde for regex search (~ case sensitive, ~* case insensitive).

In reply to Re^8: Documentation of REGEXP support in DBD::SQLite? by erix
in thread Documentation of REGEXP support in DBD::SQLite? by ibm1620

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