Add io_time for reading parquet files #31
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Add io_time metric for ParquetExec.
It is enabled only for debug builds and works only when
sync_chunk_reader
performs IO insidesync_chunk_reader
and returnsRead
object which returns bytes from memory. This is true for ourS3FileReader
andS3BufferedFileReader
, but otherObjectReader
might perform IO whenread
is called on returnedRead
object (which for example is true forLocalFileReader
).