paul-rogers commented on PR #13201: URL: https://github.com/apache/druid/pull/13201#issuecomment-1281125606
@rohangarg, thanks for the explanation about the cutoff quantity. That raises another question: how do we know the number? If a join is against an entire table, one can just look at the table cardinality (the sum of the row counts across all segments). If there is a filter on a table, estimating the post-filter row count is a difficult challenge -- one that all query planners wrestle with (and for which Calcite provides a cost-based algorithm.) Is this PR only considering the entire table cardinality? -- 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]
