Diveyam-Mishra opened a new pull request, #50233:
URL: https://github.com/apache/arrow/pull/50233
[Parquet] Guard against null level pointers in UpdateLevelHistogram
column_writer.cc
1. Added ARROW_DCHECK and null guard in the add_levels lambda
size_statistics_test.cc
2. Added regression test for empty/null span
Add an explicit null-pointer check before constructing a std::span in
TypedColumnWriterImpl::UpdateLevelHistogram. This avoids relying on the
implicit invariant that nullptr level pointers only occur when
max_level == 0.
Also add a regression test verifying that UpdateLevelHistogram handles
an empty span as a no op.
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