feat: add Enterprise license with bootstrap implementation

[ZhiHanZ]

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

This pull request updates the licensing of Databend's enterprise features by adopting the Elastic v2 license for all files under the ee directory. This change is in line with our goal to build a business around the open-source Databend project while adhering to an Open Core business model.

Background

Databend Labs has been actively contributing to the open-source community through various projects, such as Parquet, OpenDAL, and OpenRaft. Our mission is to provide a high-performance, reliable, and easy-to-use data infrastructure for all users. As we continue to grow and develop Databend, we believe that adopting an Open Core business model will allow us to sustain and accelerate our project's growth.

License Change Details

This pull request makes the following changes to the licensing of Databend's enterprise features:

1. All files under the ee directory will now be protected by the Elastic v2 license.
2. The Elastic v2 license will apply specifically to enterprise features, while the rest of the Databend project will remain open-source under Apache 2.0 License and free to use.
3. Community users who have OSS concerns could also build Apache 2.0 License Only binary distribution named databend-query-oss and databend-meta-oss

Clarification for OSS Enthusiasts

We want to clarify that this change is not intended to limit the adoption or contributions of open-source enthusiasts. The Elastic v2 license imposes only two limitations on databend users:

1. cannot use Databend as a hosted or managed service.
2. cannot change or modify the license key.

We encourage community users to continue adopting, using, and contributing to Databend without any restrictions. Your contributions are essential to the project's success, and we appreciate your ongoing support.

Frequently Asked Questions (FAQ)

Q: Will current users be affected by this license change?

A: No, current users will not be affected by this license change, as we have not yet published our enterprise functionalities. The Databend project will continue to be open-source and freely available for the majority of users. This license change only applies to future enterprise features that will be introduced under the ee directory.

Thank You

We would like to extend our gratitude to everyone who has provided suggestions and feedback regarding this change. Your input is invaluable, and we're excited to continue working together to make Databend the best data infrastructure solution possible. Special thanks to

• @c4pt0r Dongxu Huang, Co-Founder of PingCAP, for sharing his experiences around open source and for taking the time to walk around open source business models.
• @tisonkun from Apache Software Foundation for sharing his profound knowledge of different license adoptions and use cases, which ultimately made us convinced that the Elastic V2 License is the best fit for our use case
• Thanks to @Xuanwo，The PPMC of Apache OpenDAL, for helping us better understand OSS in general

Please feel free to reach out if you have any questions or concerns about this pull request or the license change.

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Name	Status	Preview	Comments	Updated (UTC)
databend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 28, 2023 4:07am

[mergify]

This pull request's title is not fulfill the requirements. @ZhiHanZ please update it 🙏.

Valid format:

fix(query): fix group by string bug
  ^         ^---------------------^
  |         |
  |         +-> Summary in present tense.
  |
  +-------> Type: rfc, feat, fix, refactor, ci, docs, chore

Valid types:

• rfc: this PR proposes a new RFC
• feat: this PR introduces a new feature to the codebase
• fix: this PR patches a bug in codebase
• refactor: this PR changes the code base without new features or bugfix
• ci: this PR changes build/testing/ci steps
• docs: this PR changes the documents or websites
• chore: this PR only has small changes that no need to record

[flaneur2020]

LGTM

[Xuanwo]

4. Separately build enterprise version(databend-query) and oss version (databend-query-oss)

How about databend-query and databend-query-enterprise? So our community users won't download enterprise binaries by mistake. There are many existing download scripts depends on this.

[PsiACE]

Mostly LGTM.

I thought we could write some FAQ's, ref: https://docs.airbyte.com/project-overview/licenses/license-faq/

[tisonkun]

Great work! Comments inline.

[ZhiHanZ]

Mostly LGTM.

I thought we could write some FAQ's, ref: https://docs.airbyte.com/project-overview/licenses/license-faq/

would definitely do it once enterprise feature delivered

[Xuanwo]

Mostly LGTM!

[flaneur2020]

LGTM 🚀

[tisonkun]

Good to go :D

[BohuTANG]

LGTM

[drmingdrmer]

Well-organized and thorough