Is there any introduction about this repository?

[ruanwenjun]

Hi, is this a usable toolkit?

[new-javacc]

It's just a parser and AST builder for now for SQL16 + Presto extensions. If that's what you are looking for - sure!

[manticore-projects]

If still relevant: I have started to work on some most basic documentation. Please see PR #31 and the preview at https://manticore-projects.github.io/sql/index.html