Function concat_batches 

pub fn concat_batches<'a>(
    schema: &Arc<Schema>,
    input_batches: impl IntoIterator<Item = &'a RecordBatch>,
) -> Result<RecordBatch, ArrowError>

Concatenates batches together into a single RecordBatch.

The output batch has the specified schemas; The schema of the input are ignored.

Returns an error if the types of underlying arrays are different.