[GitHub] [arrow] westonpace commented on issue #35000: [C++] How to make Scanner read parquet files faster?

["westonpace (via GitHub)" <gi...@apache.org>]

westonpace commented on issue #35000:
URL: https://github.com/apache/arrow/issues/35000#issuecomment-1516358571

   That is a rather small batch size.  I don't know how much profiling or focus we've had on sizes that small.  You might try something larger, like 32k.  I would expect the scanner to be slightly slower than ParquetFileReader directly but not 2x.  If you don't support any multithreading, not even I/O readahead, then what advantages are you hoping to gain by using the scanner instead of ParquetFileReader?


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