When to add the .g4 files of ClickHouse?

There is no clickhouse .g4 files in this directory：https://github.com/antlr/grammars-v4/blob/master/sql/

So when to add clickhouse' .g4 files?

you are welcome to open an PR :)

https://github.com/antlr/grammars-v4/pull/4234 I hope this is helpful to you @xlvchao