Apache Pinot

hi, Is there any guide to create table using `org.apache.pinot.plugin.inputformat.protobuf.ProtoBufRecordReader` ? I would like to use some fields of the data as row in the table.

<https://docs.pinot.apache.org/basics/data-import/pinot-input-formats#protocol-buffers|https://docs.pinot.apache.org/basics/data-import/pinot-input-formats#protocol-buffers>

You can pick the fields you need and create them in Pinot schema 

actually I am trying to understand how it resolves. For example, it supports to get some nested fields as column.
My proto format is pretty complex and I need to capture fields from nested fields. Is that possible?

Then you need to use transform function to select the column you need

how transform functions are working with `extensions` in proto definitions ?

transform functions can work on top of columns extracted from proto

if `extensions` can be extracted to a row, then you can use them