Masoud Koleini

This pull request requires documentation and unit tests to be included. In addition, there are indentation problems in the code that needs to be fixed. Please see https://github.com/fluent/fluent-bit/blob/master/CONTRIBUTING.md for the...

There are still some guidelines that are not followed, for instance: 1. Conditions with single likes don't have braces. See [Braces usage on conditionals](https://github.com/fluent/fluent-bit/blob/0374172adabc8f41e4cbc75ae9a54834a0e59293/CONTRIBUTING.md#braces-usage-on-conditionals-loops-and-functions) for the details. 2. Some variable...

Would be good to add tests if possible.

In addition to the fixes, a proper documentation on this plugin is needed. For instance, users need to know the definition of `batch window` and how it works for watermarking.

Thanks @unitmatrix, it would be great if the syntax (https://github.com/fluent/fluent-bit/tree/master/src/stream_processor#sql-statement-syntax) can be updated based on your changes as well.

Hi @unitmatrix, I reviewed the BNF syntax and looks like it requires further cleaning up, which will take care of it. I am just wondering if your test functions would...