parquet file parallel read settings

[jiangjiguang]

I have a parquet file whose size is 251.86MB, the block is 128MB. so the file has two "Row group".

The problem is: no matter how much drivers I set. has two drivers to read the file, each driver reads one Row group.

I have read the code, find the problem below：

How can I set up multiple drivers read one row group?

[raunaqmorarka]

We can't create multiple splits from a single row group in the current code. In theory it might be possible to divide a row group into smaller chunks by looking at column level page offsets, but it would significantly complicate the reader code.
What's the problem you're trying to solve ?