I've never really worked with parquet or column based systems but just searching for parquet index shows https://github.com/apache/parquet-format/blob/master/Pa

I've never really worked with parquet or column based systems but just searching for parquet index shows https://github.com/apache/parquet-format/blob/master/PageIndex.md https://github.com/apache/parquet-format/blob/master/PageInd... which describes exactly what I would expect. Maybe it doesn't work well, I don't know- I typically work with structured bundles of data, rather than purely row or column formats (I have a patent on using bundled streams for this purpose).