pitrou commented on code in PR #48692:
URL: https://github.com/apache/arrow/pull/48692#discussion_r2672572726
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cpp/src/parquet/column_writer.cc:
##########
@@ -2076,7 +2076,10 @@ Status
TypedColumnWriterImpl<ParquetType>::WriteArrowSerialize(
PARQUET_THROW_NOT_OK(ctx->GetScratchData<ParquetCType>(array.length(),
&buffer));
SerializeFunctor<ParquetType, ArrowType> functor;
- RETURN_NOT_OK(functor.Serialize(checked_cast<const ArrayType&>(array), ctx,
buffer));
+ // The value buffer could be empty if all values are nulls.
+ if (array.null_count() != array.length()) {
Review Comment:
But we don't care about invalid Arrow arrays here, do we?
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