emkornfield commented on a change in pull request #8589:
URL: https://github.com/apache/arrow/pull/8589#discussion_r517512787
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File path: cpp/src/parquet/column_writer.cc
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@@ -1230,8 +1230,9 @@ class TypedColumnWriterImpl : public ColumnWriterImpl,
public TypedColumnWriter<
buffers[0] = bits_buffer_;
// Should be a leaf array.
DCHECK_EQ(array->num_fields(), 0);
- return arrow::MakeArray(std::make_shared<ArrayData>(
- array->type(), array->length(), std::move(buffers), new_null_count));
+ return arrow::MakeArray(std::make_shared<ArrayData>(array->type(),
array->length(),
+ std::move(buffers),
Review comment:
Nice catch.
I think there is an edge case here. I think offset applies to the null
buffer also, so this would cause an illegal access if any values are actually
null. unfortunately, I think we need to slice all the buffers according to
offset.
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