Hi I'm new to pinot and find the star tree concept very interesting Can anyone explain how does it handle upserts? Is it reconstructed everytime??

No, StarTree index is not supported in upsert mode as of now. @User and @User had some initial ideas on this..

Ohh, thanks

yep, we are planning to take a stab into it later next month.

@User that's nice, do you have an approach in mind? Also, is it possible for me to take part in it?

Let’s create a GitHub issue and attach a design doc?

sure! more hands it better than less

Sounds great!