Description
Follow on to #10395
My (personal) North ⭐ : 1000 projects are built using DataFusion 📈
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
- @berkaysynnada and @ozankabak Make
CREATE EXTERNAL TABLEformat options consistent, remove special syntax forHEADER ROW,DELIMITERandCOMPRESSION#10404 - DataFusion
38.0.0Release #10217 (our first release as a Top Level Project) - @yyy1000 and @jayzhan211 are starting to move aggregate functions out of the core Move Covariance (Population) covar_pop to be a User Defined Aggregate Function #10418
- @jayzhan211 figured out an elegant way to express special case coercion rules: Introduce user-defined signature #10439
- @lewiszlw
is simplifying the internal APIs: Remove ScalarFunctionDefinition #10325 and RemoveAggregateFunctionDefinition::Name#10441 🦾 - @erratic-pattern found some great low hanging fruit refactor: Reduce string allocations in Expr::display_name (use write instead of format!) #10454
- @peter-toth and @MohamedAbdeen21 made great progress on improving CSE: Fix and improve
CommonSubexprEliminaterule #10396
Looking for help
- Someone to help @timsaucer with Make it easier to create WindowFunctions with the Expr API #6747 (there is a draft PR as hit this last week working with window functions
My (personal) plans for this week
TLDR is I plan to try and complete work on making the optimizer faster and switch to focusing on making parquet better
- Complete removing copies to make planning faster: [EPIC] Stop copying
LogicalPlanduring OptimizerPasses #9637 (we are close) - https://issues.apache.org/jira/browse/PARQUET-2470
- Document
ParquetExecmore (so it is clear / easier to understand what is already supported) - API in ParquetExec to pass in RowSelections to
ParquetExec(enable custom indexes, finer grained pushdown) #9929 (likely not this week)
Project Queue (list of future projects)
- Get Encapsulate
Viewlogic forGenericByteViewArrayarrow-rs#5619 merged (which I think will help StringViewArray implementation along) - In general, help [EPIC] Implement
StringViewArrayandBinaryViewArrayarrow-rs#5374 more actively as it seems to be stuck
Projects I plan to help actively help review / plan
- [EPIC] Implement
StringViewArrayandBinaryViewArrayarrow-rs#5374 (I am struggling to find time, but we are making progress, slowly) - [EPIC] Support converting Exprs and LogicalPlans --> SQL Strings #9494
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:
- Bug fixes (where something is just incorrect), especially regressions (where it used to work and now does not)
- Improvements directly related to features needed for InfluxDB (my employer)
- Documentation and test improvements (I view these as very strategically important)
- PRs that I think are strategically important
- 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
- Improved performance (with benchmarks)
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, especially if the PR is large/complex and not connected to a wider need, 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:
- Communicate / coordinate in the community
- Help provide an interesting summary of what is happening in DataFusion this week