FrankChen021 commented on PR #12745: URL: https://github.com/apache/druid/pull/12745#issuecomment-1175690119
@gianm I think introducing columnar-based format is very helpful. One thing I don't understand from intuition is that why the row-based format improves the final query performance because this kind of data format converting on large amount of data could be time-consuming. In ClickHouse, columnar format is always used to transfer intermidiate sub-query result between servers, and when the final result is returned to client in row-based format, we find that converting from columnar formart to row-based format and serializing each field into text format is very time consuming. Could you show me where the columnar data format is converted into row-based format? -- 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]
