fn merge_and_dedup(
schema: &SchemaRef,
options: &RegionOptions,
field_column_start: usize,
input_iters: Vec<BoxedRecordBatchIterator>,
) -> Result<BoxedRecordBatchIterator>
fn merge_and_dedup(
schema: &SchemaRef,
options: &RegionOptions,
field_column_start: usize,
input_iters: Vec<BoxedRecordBatchIterator>,
) -> Result<BoxedRecordBatchIterator>