Add development guide document

[waynexia]

To help easily get started with

[qstommyshu]

Hi @waynexia and @alamb , I'm interested in working on [EPIC] A collection of tickets for improved WASM support in DataFusion for gsoc 2025, the issue discussion guided me to this repo. I think this might be a good starting point of getting familiar with wasm-bindings for datafusion. Would you mind providing so guides on how to learn about datafusion-wasm-bindings?

Thanks in advance.

[waynexia]

Hi @qstommyshu, thanks for your enthusiasm! I added a few guides in 7bfa715, which you might be interested in 😆 Feel free to clarify any points or share your thoughts/questions.

[qstommyshu]

Hi @waynexia

Thanks for the reply! I just want to confirm datafusion-wasm-bindings is published to npm as a package providing some features from datafusion. The datafusion crates that is not supported to compile to wasm (mentioned here) is not available in this repo as well, right?

I was confused as I thought this repo provides the low level support of compiling datafusion code to wasm, but it doesn't look like it when I look at the source code.

[waynexia]

Instead of compile datafusion itself to WASM, this binding project is to wrap the datafusion and expose its interface as a WASM library. And to achieve this, we need datafusion itself can be compiled to WASM first. You can find the current status here

[qstommyshu]

Understand now, thank you @waynexia for answering my question.

As mentioned in this issue, I suppose WASM udf support is not ready yet? Which I don't see it in this WASM binding repo.

Once WASM udf support is ready, adding udf support to current repo would be a nice improvement to WASM support in DataFusion?