pub fn join_batches(
left_batches: Vec<RecordBatch>,
right_batches: Vec<RecordBatch>,
keys: &JoinKeys,
how: &JoinType,
) -> Result<Vec<RecordBatch>>pub fn join_batches(
left_batches: Vec<RecordBatch>,
right_batches: Vec<RecordBatch>,
keys: &JoinKeys,
how: &JoinType,
) -> Result<Vec<RecordBatch>>