sarutak commented on code in PR #7663:
URL: https://github.com/apache/arrow-datafusion/pull/7663#discussion_r1341799772
##########
datafusion/core/src/datasource/avro_to_arrow/arrow_array_reader.rs:
##########
@@ -775,14 +775,20 @@ impl<'a, R: Read> AvroArrowArrayReader<'a, R> {
let len = rows.len();
let num_bytes = bit_util::ceil(len, 8);
let mut null_buffer =
MutableBuffer::from_len_zeroed(num_bytes);
+ let empty_vec = vec![];
let struct_rows = rows
.iter()
.enumerate()
.map(|(i, row)| (i,
self.field_lookup(field.name(), row)))
.map(|(i, v)| {
+ let v = v.map(maybe_resolve_union);
Review Comment:
I think we need to care about array of union of `null` and record as well.
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