1. Fix a profile bug of `MergeRangeFileReader`, and add a profile `ApplyBytes` to show the total bytes of ranges. 2. There's no need to merge large columns, because `MergeRangeFileReader` will increase the copy time.
1. Fix a profile bug of `MergeRangeFileReader`, and add a profile `ApplyBytes` to show the total bytes of ranges. 2. There's no need to merge large columns, because `MergeRangeFileReader` will increase the copy time.