alamb commented on code in PR #9122:
URL: https://github.com/apache/arrow-rs/pull/9122#discussion_r2676635354
##########
parquet/src/arrow/array_reader/primitive_array.rs:
##########
@@ -212,41 +211,69 @@ where
.consume_record_data()
.into_buffer(target_type);
- let array_data = ArrayDataBuilder::new(arrow_data_type)
- .len(self.record_reader.num_values())
- .add_buffer(record_data)
- .null_bit_buffer(self.record_reader.consume_bitmap_buffer());
+ let len = self.record_reader.num_values();
+ let nulls = self
+ .record_reader
+ .consume_bitmap_buffer()
+ .map(|b| NullBuffer::new(BooleanBuffer::new(b, 0, len)));
- let array_data = unsafe { array_data.build_unchecked() };
Review Comment:
the point is to avoid this ArrayData as we know here what types of arrays
will be built
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