Replace the hybrid scan single-file secondary-filter API by qbacpey · Pull Request #23800 · NVIDIA/cudf

qbacpey · 2026-08-25T07:38:34Z

Description

Replaces single-file hybrid_scan_reader::secondary_filters_byte_ranges() with separate bloom_filters_byte_ranges() and dictionary_pages_byte_ranges(), matching hybrid_scan_multifile signatures.

Updates all consumers: C++ tests/example/benchmarks, pylibcudf bindings, and Java/JNI. Java's SecondaryFilterRanges is replaced by two ByteRange[] accessors

Checklist

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

…bloom filter` and `dict filter` API, update Java, Python, and examples related to it

copy-pr-bot · 2026-08-25T07:38:38Z

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qbacpey · 2026-08-25T07:40:12Z

/ok to test 16c1ac6

…ry page byte range retrieval.

…d remove redundant assertions on reported ranges.

qbacpey · 2026-08-25T13:57:59Z

/ok to test 12d3b7d

…filter processing

qbacpey · 2026-08-25T14:40:34Z

-
  // Filter row groups with dictionary pages
  auto dict_page_filtered_row_groups = std::vector<cudf::size_type>{};
  dict_page_filtered_row_groups.reserve(current_row_group_indices.size());


Maybe no needed since dict_page_filtered_row_groups = reader.filter_row_groups_with_dictionary_pages(...); would move-assign?

can't we just delete these lines and just assign current_row_group_indices = reader.filter_row_groups_with_dictionary_pages(...)

I tried that locally, but current_row_group_indices is a cudf::host_span, so assigning the returned vector directly does not compile.

coderabbitai · 2026-08-28T07:14:26Z

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python/cudf_polars/cudf_polars/streaming/io.py

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📝 Walkthrough

Summary by CodeRabbit

New Features
- Added separate APIs for retrieving Bloom-filter and dictionary-page byte ranges in C++, Java, and Python.
- Updated Hybrid Scan documentation with independent filtering workflows and usage requirements.
Performance Improvements
- Dictionary-page filtering now runs before Bloom-filter range discovery, reducing unnecessary Bloom-filter reads for eliminated row groups.
Breaking Changes
- Replaced the combined secondary-filter byte-range API and removed its associated Java type. Existing integrations must migrate to the separate APIs.
Bug Fixes
- Improved metadata retention for streaming Parquet scans when only some files are sampled.

Walkthrough

The hybrid scan API now retrieves bloom-filter and dictionary-page byte ranges independently. C++, Python, Java, JNI, examples, benchmarks, and tests use the split APIs. Filter orchestration retrieves bloom ranges after dictionary-page filtering.

Changes

Hybrid scan API migration

Layer / File(s)	Summary
C++ range API and contracts `cpp/include/cudf/io/experimental/hybrid_scan.hpp`, `cpp/src/io/parquet/experimental/hybrid_scan*`	Replaces `secondary_filters_byte_ranges()` with separate bloom-filter and dictionary-page methods. Updates filtering contracts and examples.
Sequential filter range retrieval `cpp/benchmarks/io/parquet/experimental/hybrid_scan/`, `cpp/examples/hybrid_scan_io/`, `python/cudf_polars/cudf_polars/streaming/io.py`, `cpp/tests/io/experimental/hybrid_scan_*`	Retrieves dictionary-page ranges first, then bloom-filter ranges for the remaining row groups. Preserves sampled Parquet metadata for partial samples.
Python and Java binding migration `python/pylibcudf/pylibcudf/io/experimental/`, `python/pylibcudf/pylibcudf/libcudf/io/hybrid_scan.pxd`, `java/src/main/java/ai/rapids/cudf/`, `java/src/main/native/src/HybridScanReaderJni.cpp`	Exposes independent range methods and removes `SecondaryFilterRanges`.
Cross-language API validation `cpp/tests/*`, `java/src/test/java/ai/rapids/cudf/HybridScanReaderTest.java`, `python/pylibcudf/tests/io/test_experimental_hybrid_scan.py`	Updates range retrieval, pruning, argument-validation, lifecycle, and dictionary-page tests.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: ⚪ Minimal · up to fa721

This API replacement updates its listed C++, Python, and Java consumers without any identified merge-blocking risk at the current head; it is merge-ready after normal checks and review.

Possibly related PRs

NVIDIA/cudf#23709: Directly related hybrid-scan dictionary-page range and filtering API changes.

Suggested reviewers: tomaugspurger, paul-aiyedun

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	Most changes are within scope, but the ParquetMetadata sampling and cached-metadata propagation changes in python/cudf_polars/cudf_polars/streaming/io.py are unrelated to the linked API migration.	Remove the unrelated ParquetMetadata sampling changes from this pull request or move them to a separate pull request. Retain only the Bloom-filter API call update in that file.
Docstring Coverage	⚠️ Warning	Docstring coverage is 47.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 40 functions across 15 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the primary change: replacing the single-file hybrid scan secondary-filter API.
Description check	✅ Passed	The description directly explains the API replacement and identifies the affected C++, Python, Java, JNI, test, and documentation updates.
Linked Issues check	✅ Passed	The changes satisfy issue `#23801` by replacing the combined API with separate bloom-filter and dictionary-page APIs and updating the C++, Python, Java, JNI, example, benchmark, and test consumers.

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Actionable comments posted: 1

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Inline comments:
In `@cpp/include/cudf/io/experimental/hybrid_scan.hpp`:
- Around line 241-244: Update the bloom-filter example around
bloom_filters_byte_ranges() to use a 32-byte-aligned memory resource for the
subsequent fetch and filter_row_groups_with_bloom_filters() calls, matching the
aligned resource pattern used by the hybrid scan composer; replace the unaligned
mr usage while preserving the existing row-group and bloom-filter flow.

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📥 Commits

Reviewing files that changed from the base of the PR and between 45d262a and 75e9aaa.

📒 Files selected for processing (19)

cpp/benchmarks/io/parquet/experimental/hybrid_scan/dict_page_filter.cpp
cpp/benchmarks/io/parquet/experimental/hybrid_scan/hybrid_scan_composer.cpp
cpp/examples/hybrid_scan_io/hybrid_scan_composer.cpp
cpp/include/cudf/io/experimental/hybrid_scan.hpp
cpp/src/io/parquet/experimental/hybrid_scan.cpp
cpp/src/io/parquet/experimental/hybrid_scan_impl.cpp
cpp/src/io/parquet/experimental/hybrid_scan_impl.hpp
cpp/tests/io/experimental/hybrid_scan_common.cpp
cpp/tests/io/experimental/hybrid_scan_composer.cpp
cpp/tests/io/experimental/hybrid_scan_filters_test.cpp
cpp/tests/streams/io/experimental/hybrid_scan_test.cpp
java/src/main/java/ai/rapids/cudf/HybridScanReader.java
java/src/main/java/ai/rapids/cudf/SecondaryFilterRanges.java
java/src/main/native/src/HybridScanReaderJni.cpp
java/src/test/java/ai/rapids/cudf/HybridScanReaderTest.java
python/pylibcudf/pylibcudf/io/experimental/hybrid_scan.pyi
python/pylibcudf/pylibcudf/io/experimental/hybrid_scan.pyx
python/pylibcudf/pylibcudf/libcudf/io/hybrid_scan.pxd
python/pylibcudf/tests/io/test_experimental_hybrid_scan.py

💤 Files with no reviewable changes (3)

cpp/src/io/parquet/experimental/hybrid_scan_impl.cpp
java/src/main/java/ai/rapids/cudf/SecondaryFilterRanges.java
cpp/src/io/parquet/experimental/hybrid_scan_impl.hpp

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mhaseeb123

Looks good. Please take a look at comments from coderabbit and see if they are worth handling

Remove single file secondary_filters_byte_ranges. Add single file `…

16c1ac6

…bloom filter` and `dict filter` API, update Java, Python, and examples related to it

qbacpey added this to the Parquet continuous improvement milestone Aug 25, 2026

qbacpey added this to libcudf Aug 25, 2026

qbacpey added 2 - In Progress Currently a work in progress libcudf Affects libcudf (C++/CUDA) code. Python Affects Python cuDF API. Java Affects Java cuDF API. labels Aug 25, 2026

github-project-automation Bot added this to cuDF Python Aug 25, 2026

qbacpey added breaking Breaking change pylibcudf Issues specific to the pylibcudf package labels Aug 25, 2026

github-project-automation Bot moved this to Todo in cuDF Python Aug 25, 2026

github-actions Bot assigned qbacpey Aug 25, 2026

qbacpey added the improvement Improvement / enhancement to an existing function label Aug 25, 2026

qbacpey mentioned this pull request Aug 25, 2026

[FEA] Replace the hybrid scan single-file secondary-filter API #23801

Open

qbacpey removed the Python Affects Python cuDF API. label Aug 25, 2026

Adjust hybrid scan filter logic to separate bloom filter and dictiona…

88c965a

…ry page byte range retrieval.

github-actions Bot added the Python Affects Python cuDF API. label Aug 25, 2026

Update comments in hybrid scan test to clarify filter requirements an…

12d3b7d

…d remove redundant assertions on reported ranges.

Refactor hybrid scan filter logic to streamline dictionary and bloom …

2e19ed4

…filter processing

qbacpey commented Aug 25, 2026

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Merge branch 'main' into hybrid/api-split-t3

75e9aaa

qbacpey changed the title ~~Remove single file secondary_filters_byte_ranges API~~ Replace the hybrid scan single-file secondary-filter API Aug 28, 2026

qbacpey requested review from mhaseeb123, paul-aiyedun and pmattione-nvidia August 28, 2026 07:09

qbacpey marked this pull request as ready for review August 28, 2026 07:09

qbacpey requested a review from a team as a code owner August 28, 2026 07:09

qbacpey requested review from a team as code owners August 28, 2026 07:09

qbacpey requested a review from TomAugspurger August 28, 2026 07:09

coderabbitai Bot reviewed Aug 28, 2026

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Comment thread cpp/include/cudf/io/experimental/hybrid_scan.hpp

Refactor bloom filter range retrieval in hybrid scan reader

fb08810

qbacpey requested a review from a team as a code owner August 28, 2026 09:23

github-actions Bot added the cudf-polars Issues specific to cudf-polars label Aug 28, 2026

qbacpey added 3 - Ready for Review Ready for review by team and removed 2 - In Progress Currently a work in progress labels Aug 28, 2026

pmattione-nvidia approved these changes Aug 28, 2026

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mhaseeb123 approved these changes Aug 28, 2026

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qbacpey and others added 3 commits August 28, 2026 22:26

Update example doc

b02957e

Uniform doc string

d9e1bb7

Merge branch 'main' into hybrid/api-split-t3

fa721d1

Matt711 approved these changes Aug 28, 2026

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Replace the hybrid scan single-file secondary-filter API - #23800

Replace the hybrid scan single-file secondary-filter API#23800
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