Tracking Issue: Improve flow functionality

[discord9]

What type of enhancement is this?

Other

What does the enhancement do?

v0.9 TODO List

• [x] reuse available scalar function from DataFusion to expand scalar function support
• [x] run in distributed mode with standalone functionality #4094
• [ ] better arrangement(internal state) design&refactor

v1.0 TODO List

• [ ] preliminary UDF&UDAF support within flow
• [ ] more time window type, including hop&temporal filter
• [ ] join

Implementation challenges

No response