As I remember it was introduced in 2018th: https://www.elastic.co/blog/an-introduction-to-elasticsearch-sql-with-practical-examples-part-1 https://www.elastic.c

As I remember it was introduced in 2018th: https://www.elastic.co/blog/an-introduction-to-elasticsearch-sql-with-practical-examples-part-1 https://www.elastic.co/blog/an-introduction-to-elasticsearch..., although there was an open source extension for that… Although I wasn’t very hard to implement it for a subset of queries like group by, etc. - primary problem was a good OSS sql parser. We used Presto back in 2016th for that