lichuang commented on code in PR #9275:
URL: https://github.com/apache/arrow-rs/pull/9275#discussion_r2740508916
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arrow-row/src/list.rs:
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@@ -120,17 +120,35 @@ pub unsafe fn decode<O: OffsetSizeTrait>(
let mut offsets = Vec::with_capacity(rows.len() + 1);
offsets.push(O::usize_as(0));
+ // Check if child is Null type - if so, we need special handling
+ // to count elements correctly even when they decode to 0 bytes
+ let is_null_child = matches!(&field.data_type, DataType::List(f) if
f.data_type() == &DataType::Null)
Review Comment:
ok, i fix this problem in encode phase.
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