Read/write Parquet IEEE 754 `nan_count` and column order fields by mhaseeb123 · Pull Request #24752 · NVIDIA/cudf

mhaseeb123 · 2026-10-21T20:20:01Z

Description

Part 1/3

This PR adds the nan_count and nan_counts statistics fields and the IEEE_754_TOTAL_ORDER column order from apache/parquet-format#514 to the Parquet thrift structs, reader and writer.

Checklist

I am familiar with the Contributing Guidelines.
New or existing tests cover these changes.
The documentation is up to date with these changes.

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cpp/tests/io/experimental/parquet_footer_facade_test.cpp

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📝 Summary

Summary by CodeRabbit

New Features
- Added support for IEEE 754 total ordering in Parquet column metadata.
- Parquet metadata now supports total NaN counts for columns and per-page NaN counts for floating-point data.
- NaN counts and column ordering information are preserved when reading and writing Parquet metadata.
Tests
- Expanded Parquet metadata validation to verify round-trip preservation of null and NaN statistics.

Parquet metadata types and compact protocol handling now support optional NaN counts and the IEEE_754_TOTAL_ORDER column order. Footer round-trip tests cover NaN statistics and the added column order.

Changes: Parquet metadata support

Layer / File(s)	Summary
NaN counts and column order in metadata `cpp/include/cudf/io/parquet_schema.hpp`, `cpp/src/io/parquet/compact_protocol_reader.cpp`, `cpp/src/io/parquet/compact_protocol_writer.cpp`, `cpp/tests/io/experimental/parquet_footer_facade_test.cpp`	The metadata types add optional total and per-page NaN counts and the `IEEE_754_TOTAL_ORDER` option. The compact protocol reader and writer handle the new fields and order. Footer tests cover NaN statistics and the new order.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Suggested reviewers: vuule

Merge Risk: 🔵 Low · up to 6958a

The test now uses valid floating-point metadata. Written page indexes still omit optional per-page NaN counts, but current readers are unaffected, making this a low-risk follow-up rather than a merge blocker.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main changes: Parquet support for IEEE 754 NaN count and column order fields.
Description check		The description directly explains the added Parquet statistics fields and IEEE_754_TOTAL_ORDER support. It also identifies test and documentation coverage.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Inline comments:
Review comments at @cpp/tests/io/experimental/parquet_footer_facade_test.cpp:
- Line 79: Update the Parquet footer fixture so the leaf carrying nan_count is
FLOAT or DOUBLE and the leaf using IEEE_754_TOTAL_ORDER is the same
floating-point column; assign valid column orders for all three schema leaves.
Preserve the round-trip assertions while ensuring the fixture exercises a valid
floating-point IEEE-order footer.

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📒 Files selected for processing: 4

cpp/include/cudf/io/parquet_schema.hpp
cpp/src/io/parquet/compact_protocol_reader.cpp
cpp/src/io/parquet/compact_protocol_writer.cpp
cpp/tests/io/experimental/parquet_footer_facade_test.cpp

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mhaseeb123 · 2026-10-21T20:54:29Z

@ttnghia I know a couple lines here are borrowed from your PR #24419. Depending on merge order, we can just pull in changes (should be trivial).

ttnghia

Please make sure no conflict with #24419.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

mhaseeb123 · 2026-10-21T20:56:25Z

Please make sure no conflict with #24419.

Lol I was just mentioning that #24752 (comment). I think both PRs have the same diff at one place so things should be clean. If there's any conflict it would be really trivial

mhaseeb123 · 2026-10-21T20:58:43Z

 struct ColumnOrder {
  /// Available column order types
-  enum Type : uint8_t { UNDEFINED, TYPE_ORDER };
+  enum Type : uint8_t { UNDEFINED, TYPE_ORDER, IEEE_754_TOTAL_ORDER };


@ttnghia I think #24419 just adds another field to this: INT96_TIMESTAMP_ORDER = 3 and pins all of these. Not done here. If there's any conflict it would just be here. You can easily accept your own changes.

…count-part-1 # Conflicts: # cpp/include/cudf/io/parquet_schema.hpp # cpp/src/io/parquet/compact_protocol_reader.cpp # cpp/src/io/parquet/compact_protocol_writer.cpp

mhaseeb123 · 2026-10-22T01:41:43Z

Absorbed by #24753

mhaseeb123 requested a review from a team as a code owner October 21, 2026 20:20

mhaseeb123 requested a review from ttnghia October 21, 2026 20:20

mhaseeb123 added libcudf Affects libcudf (C++/CUDA) code. improvement Improvement / enhancement to an existing function labels Oct 21, 2026

mhaseeb123 requested a review from pmattione-nvidia October 21, 2026 20:20

mhaseeb123 added the non-breaking Non-breaking change label Oct 21, 2026

github-actions Bot assigned mhaseeb123 Oct 21, 2026

mhaseeb123 mentioned this pull request Oct 21, 2026

Support Parquet IEEE 754 nan_count statistics fields #24753

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mhaseeb123 added the 4 - Needs Review Waiting for reviewer to review or respond label Oct 21, 2026

mhaseeb123 changed the title ~~Support Parquet IEEE 754 nan_count and column order fields~~ Read/write Parquet IEEE 754 nan_count and column order fields Oct 21, 2026

mhaseeb123 force-pushed the claude/parquet-nan-count-part-1 branch from ea0ae3a to 2851135 Compare October 21, 2026 20:28

coderabbitai Bot reviewed Oct 21, 2026

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Comment thread cpp/tests/io/experimental/parquet_footer_facade_test.cpp Outdated

ttnghia approved these changes Oct 21, 2026

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Read and write Parquet IEEE 754 NaN count and column order fields

6958ae2

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

mhaseeb123 force-pushed the claude/parquet-nan-count-part-1 branch from 2851135 to 6958ae2 Compare October 21, 2026 20:55

mhaseeb123 commented Oct 21, 2026

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Merge remote-tracking branch 'upstream/main' into claude/parquet-nan-…

48d1412

…count-part-1 # Conflicts: # cpp/include/cudf/io/parquet_schema.hpp # cpp/src/io/parquet/compact_protocol_reader.cpp # cpp/src/io/parquet/compact_protocol_writer.cpp

mhaseeb123 closed this Oct 22, 2026

mhaseeb123 deleted the claude/parquet-nan-count-part-1 branch October 22, 2026 01:41

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Read/write Parquet IEEE 754 `nan_count` and column order fields - #24752

Read/write Parquet IEEE 754 `nan_count` and column order fields#24752
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mhaseeb123 commented Oct 21, 2026

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