sfluor opened a new pull request, #16195: URL: https://github.com/apache/datafusion/pull/16195
See this issue: https://github.com/apache/datafusion/issues/16044 The MetricValue enum currently exposes only single-value statistics: counts, gauges, timers, timestamps, and a few hard-coded variants such as SpillCount or OutputRows. However there's often the need for custom metrics when using custom PhysicalPlans. At Datadog for instance we had the need for tracking the distribution of latencies of the sub-queries issued by a given phyiscal plan to be able to pin-point outliers. Similarly tracking the topN slowest sub-query is something that has been quite useful to help us debug slow queries. This PR allows each user to define their own MetricValue types as long as they are aggregatable. A very basic example is included in the PR using a custom counter. ## Which issue does this PR close? <!-- We generally require a GitHub issue to be filed for all bug fixes and enhancements and this helps us generate change logs for our releases. You can link an issue to this PR using the GitHub syntax. For example `Closes #123` indicates that this PR will close issue #123. --> - Closes #. ## Rationale for this change <!-- Why are you proposing this change? If this is already explained clearly in the issue then this section is not needed. Explaining clearly why changes are proposed helps reviewers understand your changes and offer better suggestions for fixes. --> ## What changes are included in this PR? <!-- There is no need to duplicate the description in the issue here but it is sometimes worth providing a summary of the individual changes in this PR. --> ## Are these changes tested? <!-- We typically require tests for all PRs in order to: 1. Prevent the code from being accidentally broken by subsequent changes 2. Serve as another way to document the expected behavior of the code If tests are not included in your PR, please explain why (for example, are they covered by existing tests)? --> ## Are there any user-facing changes? <!-- If there are user-facing changes then we may require documentation to be updated before approving the PR. --> <!-- If there are any breaking changes to public APIs, please add the `api change` label. --> -- 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: github-unsubscr...@datafusion.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For additional commands, e-mail: github-h...@datafusion.apache.org
