Rich-T-kid opened a new issue, #25411:
URL: https://github.com/apache/datafusion/issues/25411
transform_values breaks when the map's value field is Dictionary(K, V)
encoded
Two problems:
1. Planning: lambda_parameters exposes the raw Dictionary(K, V) type as
the lambda variable type, but the lambda body expects the plain value type
(Utf8). Type mismatch at planning time.
2. Execution : even if planning passes, flat_values is a Dictionary array
and the lambda body receives the wrong type.
should lambda have native support for dictionary instead of introducing a
two-way cast?
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