petern48 opened a new issue, #19536: URL: https://github.com/apache/datafusion/issues/19536
Great catch. I looked into it, and it seems like it's wrapping around due to integer overflow while taking the average of the middle two values (since the count is even). ``` low: [-85], high: -56, median: 57 datatype: Int8 ``` -85 + -56 = -141 -> wraparound to 115 Then 115 / 2 -> 57.5 -> 57 (truncated due to integer type) What's our desired behavior in this case? We could promote to a larger datatype to perform the calculation. Also is it intentional to return the value as a truncated integer instead of a float? _Originally posted by @petern48 in https://github.com/apache/datafusion/pull/19278#discussion_r2617308599_ The overflow part was fixed in https://github.com/apache/datafusion/issues/19322, but the truncation issue remains. Other databases seem to return a float: https://github.com/apache/datafusion/issues/19322#issuecomment-3693042381 -- 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]
