Function decode_batch_to_data 

pub fn decode_batch_to_data(
    metadata: &HashMap<String, String>,
    batch: RecordBatch,
    allow_custom_fallback: bool,
) -> Result<Vec<Data>>

Decodes a RecordBatch to Data objects based on metadata.

Supports both standard data types and custom data types when allow_custom_fallback is true (e.g. when decoding files under custom/). When false, unknown type names produce an error instead of attempting custom decode.

Errors

Returns an error if decoding fails or the type is unknown (and custom fallback not allowed).