Describe the bug
~170 sqllogictest cases are failing in Substrait round-trip mode because of the following error:
query failed: DataFusion error: This feature is not implemented: Unsupported cast type: Dictionary(Int32, Utf8)
To Reproduce
cargo test --test sqllogictests -- --substrait-round-trip aggregate.slt:5026
Expected behavior
The sqllogictest passes in Substrait round-trip mode
Additional context
This is part of a broader initiative to improve the reliability of Substrait-to-DataFusion logical plan conversions.