gabotechs opened a new pull request, #21762:
URL: https://github.com/apache/datafusion/pull/21762
## Which issue does this PR close?
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- None
## Rationale for this change
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the issue then this section is not needed.
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Sometimes, when an `ExecutionPlan` implementation is complex, different
metrics are collected from different structs that compose the whole execution
plan.
These metrics need to eventually be served from the single entrypoint
`ExecutionPlan::metrics()` or `DataSource::metrics()`, and the current api does
not have good methods for merging several `ExecutionPlanMetricsSet` coming from
different sources into a single one.
## What changes are included in this PR?
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sometimes worth providing a summary of the individual changes in this PR.
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Add some basic conversion and iteration methods for `MetricsSet` and
`ExecutionPlanMetricsSet`, in order to improve ergonomics around these structs.
## Are these changes tested?
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This is purely just basic std trait implementations and method exposure, so
as long as the code compiles, I don't think it needs further tests.
## Are there any user-facing changes?
People will see some more available methods in the `MetricsSet` and
`ExecutionPlanMetricsSet` structs for ergonomics.
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