[CONTRIBUTING]: Issues to work on for release 0.3.0

[jonathanc-n]

This is a place to allow contributors to look at all the issues to be worked on for 0.3.0; some of the issues are dependant on one another so I decided to organize them all in one place for people to see what can be worked on. They are separated in categories for the areas that are being looked to be supported.

Queries

• Table API Support
• *Support CoW incremental query #9
• *Support predicate pushdown for column stats #159 (0.4.0)
• Support extracting column stats #48

Datafusion

• feat: support filter pushdown for datafusion #203
• Integrate with datafusion to support projection pushdown from SQL #206
• Integrate with datafusion to support limit pushdown from SQL #207

Hudi Errors

• feat: define Hudi error types across hudi-core #124
• refactor: enhance error handling with custom ConfigError type #59

*If issue has asterisk, it is dependent on the issue above it (the issue that needs to be merged first)

If a feature seems non-trivial then give a high level idea of what is to be done and @xushiyan can review/assign. In addition, there is much more CI/testing work to be done which can be found here:
https://github.com/apache/hudi-rs/milestone/3

[jonathanc-n]

@xushiyan Just made this to make the development process easier as it is sometimes not clear if there is an issue that precedes another. If it looks fine, I would appreciate it if this was pinned at the top of issues.

[xushiyan]

Thanks for the initiative for organizing the tasks! It's an important overview to see and plan for the release. We are actually maintaining release progress using GH project. I've updated this view https://github.com/orgs/apache/projects/356/views/4 so we can save some overhead in project management. The only missing feature there is the dependency link to indicate an issue depending on another, but the current dependencies are limited and manageable, so we can still go along with the GH project view. We can follow the target dates for sequencing the work. I'll update the contribution guide about this process.