sunchao commented on issue #1652: URL: https://github.com/apache/arrow-datafusion/issues/1652#issuecomment-1023620113
> It will (in version after 8.0.0) preserve dictionary encoding (meaning the output of a dictionary encoded column will also be dictionary encoded) which should be a large win for low cardinality columns This is nice 👍 . By dictionary-based row group filtering I mean we can first decode only the dictionary pages for the column chunks where pushed down predicates (e.g., in predicate) are associated to, and skip the whole row group if no keys in the dictionary match. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
