lirui-apache commented on PR #4596: URL: https://github.com/apache/iceberg/pull/4596#issuecomment-1139231560
@rdblue We implemented file-level index for iceberg and use the index to determine whether a file satisfies the query predicate. Although the index file is much smaller than the data file, we wouldn't want to load them in trino coordinator. So the filtering happens on worker nodes. Trino coordinator schedules the file scan tasks in a streaming fashion, so it doesn't have to hold all of them in memory (it does such thing during query optimization though, which we are trying to avoid). -- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
