MichaelScofield opened a new pull request, #10050:
URL: https://github.com/apache/arrow-datafusion/pull/10050
## Which issue does this PR close?
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Closes #.
## Rationale for this change
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The `SessionConfig` has an "`extensions: AnyMap`", can be used "... to
attach extra data to the session config -- e.g. tracing information or
caches."(from `with_extension`'s docs). However, there's no place to add an
extension from the `SessionState` site, which limits its functionality,
especially when the attached extra data is wanted in optimizing physical plan
stage.
## What changes are included in this PR?
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This PR adds a `config_mut` in `SessionState` to get the mutable ref to
`SessionConfig` to resolve the issue above.
## Are these changes tested?
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Covered.
## Are there any user-facing changes?
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A new method is added, not breaking existing codes.
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