gene-bordegaray opened a new issue, #24695:
URL: https://github.com/apache/datafusion/issues/24695
### 4 Physical-plan serialization
Before `ProjectionExecNode` serialized:
```protobuf
PhysicalPlanNode input = 1;
repeated PhysicalExprNode expr = 2;
repeated string expr_name = 3;
```
On decode, DataFusion reconstructed the projection which is fine when the
complete output schema can be derivde from the expression and input but
metadata cannot be:
Given:
```text
Input field:
value: Int32
metadata: {}
Expression: value@0 AS value
---
derives...
---
Output field:
value: Int32
metadata: {}
Receiving process gets...
---
ProjectionExec
output schema:
value: Int32
field metadata: {}
schema metadata: {}
```
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