Follow on to #9899

It would be great for other contributors to DataFusion who plan non trivial work could try to make them visible somehow as well 🙏 (feel free to copy / modify the format)

My Highlights from Last Week

• 37.0.0 was released Release DataFusion 37.0.0 #9682 🚀
• DataFusion WASM is becoming a thing @milenkovicm showed us how to make WASM UDFs WASM UDFs #9326 / https://github.com/milenkovicm/wasaffi and @waynxia showed off a WASM playground: Web Playground with WASM #9834
• @peter-toth made LogicalPlan rewriting with TreeNode easier and faster: Consistent LogicalPlan subquery handling in TreeNode::apply and TreeNode::visit  #9913
• @jayzhan211 began pulling aggregate functions out of the core: Move First Value UDAF and builtin first / last function to aggregate-functions #9960
• "Extract scalar functions from the core" continues: [Epic] Port BuiltInFunctons to datafusion-functions-* crates #9285 (thanks @erenavsarogullari and @Omega359 for keeping the 🚋 running here)
• Started talking about indexing: Indexing Support in DataFusion? #9963
• Started talking about ListingTable: [EPIC] Improve the performance of ListingTable #9964

My (personal) goals

1000 projects are built using DataFusion 📈

My (personal) plans for this week

• Release version 0.45.0 datafusion-sqlparser-rs#1162
• Reviews !
• Make query planning (at least) 2x faster [EPIC] Stop copying LogicalPlan during OptimizerPasses #9637)
• Document ParquetExec more (so it is clear / easier to understand what is already supported and what else could be useful API in ParquetExec to pass in RowSelections to ParquetExec (enable custom indexes, finer grained pushdown) #9929)

Project Queue (list of future projects)

• API in ParquetExec to pass in RowSelections to ParquetExec (enable custom indexes, finer grained pushdown) #9929

Projects I plan to help actively help review / plan

• [EPIC] Implement StringViewArray and BinaryViewArray arrow-rs#5374
• [Epic] Port BuiltInFunctons to datafusion-functions-* crates #9285
• [EPIC] Support converting Exprs and LogicalPlans --> SQL Strings #9494
• Supporting using parallel parquet writer outside of Datafusion query execution #9493 with @wiedld

Algorithm for (my) prioritizing PR reviews

Note there are many committers who can and do review and merge PRs, so this is not the priorities of the project as a whole, just the approximate algorithm I use to prioritize my own time

Priority:

1. Bug fixes (where something is just incorrect), especially regressions (where it used to work and now does not)
2. Improvements directly related to features needed for InfluxDB (my employer)
3. Documentation and test improvements (I view these as very strategically important)
4. PRs that I think are strategically important
5. Other new features / additions to functionality (note this is the lowest)

The top strategically important projects in my head are:

• Anything that makes it easier to use DataFusion as a user (docs, examples, better APIs, etc), including Getting started guide for new users (who want to use DataFusion in their project)
• Anything that improves DataFusion's quality such as bug fixes, and improved / expanded tests, etc
• Making function packages modular and easier to mix/match: [EPIC] Unify Function Interface (remove BuiltInScalarFunction) #8045

Thus, if you are interested in contributing to DataFusion and are interested in a fast turn around time I would recommend looking into bug fixes / test improvements / documentation or the projects named above

If you propose adding new functionality, the review cycle will likely be longer. You can make it a shorter cycle by looking at the comments on other recent PRs and following the same model (e.g. ensure there are tests in sqllogictest for example, the CI passes, includes documentation, etc)

Background

The idea of this ticket is make my plans for DataFusion visible, largely for my own personal organizational needs, but also to:

1. Communicate / coordinate in the community
2. Help provide an interesting summary of what is happening in DataFusion this week