Ted-Jiang opened a new issue, #3024:
URL: https://github.com/apache/arrow-datafusion/issues/3024

   **Is your feature request related to a problem or challenge?
   Relate #2965 
   
https://github.com/apache/arrow-datafusion/blob/193fc3b4549ed40a08218b744388f9211605ab53/datafusion/core/src/physical_plan/file_format/file_stream.rs#L218-L228
   Before i add the cost time metric here. But there are two sub future or 
stream under `self.poll_inner(cx)`
   
   one is a future to read parquet metadata
   
https://github.com/apache/arrow-datafusion/blob/193fc3b4549ed40a08218b744388f9211605ab53/datafusion/core/src/physical_plan/file_format/file_stream.rs#L162-L165
   
   another is: for read and decode  data
   
https://github.com/apache/arrow-datafusion/blob/193fc3b4549ed40a08218b744388f9211605ab53/datafusion/core/src/physical_plan/file_format/file_stream.rs#L177-L181
   
   If these future are not ready will return `Poll::Pending`, which will make 
the task blocked and need someone wake itself.
   
   So we miss the  read_meta time and reading time.
   
   **Describe the solution you'd like**
   A clear and concise description of what you want to happen.
   
   **Describe alternatives you've considered**
   A clear and concise description of any alternative solutions or features 
you've considered.
   
   **Additional context**
   Add any other context or screenshots about the feature request here.
   


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