timsaucer opened a new pull request, #16170:
URL: https://github.com/apache/datafusion/pull/16170
## Which issue does this PR close?
- Closes #15797
## Rationale for this change
This is an alternative to https://github.com/apache/datafusion/pull/16053
In this version, we change the enum variant of `Literal` in both logical and
physical expressions to contain the optional metadata. This is a deeper change
than #16053 but it does make an easier to follow data flow path. Rather than
relying on complex checking on the schema during simplification and creation of
the physical plans, it adds the schema to the logical expression.
## What changes are included in this PR?
- Add optional metadata to literal variant of logical expression
- Add optional metadata to literal variant of physical expression
- Update optimizer to combine metadata on aliases
## Are these changes tested?
Tested with unit tests and add additional unit test that specifically checks
for metadata on the input and output of scalar values.
## Are there any user-facing changes?
The biggest change is that users who check literal values will need to
update their enum variants to take and pass the additional metadata field.
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