In fact, we have an open-source query language, but it's still in experimental, so we don't present it on the website. The description of the enterprise feature is not precise. Sorry for the inconvenience.
GreptimeDB also open-sources the log view UI if you read the article.
I agree with you that ETL is so powerful, and GreptimeDB is so young, we still have lots of work to do. Thank you.