viczsaurav commented on issue #1365:
URL:
https://github.com/apache/datafusion-comet/issues/1365#issuecomment-2640645653
Can we use the following approach? Where would this example reside?
1. Initialize DataFusion Context
2. Define Custom Expression
- Implement a Scalar Function using `make_scalar_function`.
- Simple string conversion = StringArray => uppercase strings
3. Register the Expression
- Wrap the function in a ScalarUDF.
- Specify input/output data types and function volatility.
- Add it to SessionContext using register_udf().
4. Use in SQL Query
- Read data into a data frame / create it from in-memory `Vec`
- Execute an SQL query that invokes the registered function.
5. Display Results - Show the transformed output using `.show().await?.`
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