LDM-A opened a new pull request, #24103:
URL: https://github.com/apache/datafusion/pull/24103
## Which issue does this PR close?
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- Closes #23820 .
## Rationale for this change
Explained accordingly in the issue linked above.
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## What changes are included in this PR?
1. Introduces a "duplicate_nulls" field to "FunctionalDependence" to
distinguish UNIQUE constraints from PRIMARY_KEY constraints.
2. Skips UNIQUE dependencies in "get_target_functional_dependencies" so
dependent columns are no longer added to GROUP_BY
3. Adds "get_nullable_unique_target_functional_dependencies" to identify
targets of UNIQUE dependencies.
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## Are these changes tested?
Yes exisiting tests created by @alamb previously passing are now failing as
they represented incorrect behavior. I think it best to change these tests
once @alamb is happy with the initial changes here.
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## Are there any user-facing changes?
No public API changes
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