fengys1996 opened a new pull request, #26177:
URL: https://github.com/apache/datafusion/pull/26177
## Which issue does this PR close?
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- Closes #.
## Rationale for this change
Scalar function planners need access to the input schema to inspect argument
types and field metadata, enabling expression rewrites.
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## What changes are included in this PR?
Add a `&DFSchema` parameter to `ExprPlanner::plan_scalar` and pass the input
schema during SQL planning.
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## What is the testing strategy for this PR?
Updated `select_scalar_func_with_expr_planner` to verify that the planner
can resolve a column argument’s type using the input schema and correctly
rewrite the function call.
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## Are there any user-facing changes?
Yes. Implementations overriding `ExprPlanner::plan_scalar` must accept an
additional `&DFSchema` parameter. This is a breaking API change.
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