Add apply_retention_mask and deprecate apply_boolean_mask - #23700
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apply_boolean_mask in favor of apply_retention_maskapply_retention_mask and deprecate apply_boolean_mask
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Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review. 📝 WalkthroughSummary by CodeRabbit
WalkthroughChangesRetention-mask API migration
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The new retention-mask API does not consistently reject size-mismatched masks for empty or zero-row inputs as its contract requires, which can cause inconsistent behavior for callers. This should be addressed or explicitly accepted before merging. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Full details: Linked Issues checkExplanation The changes satisfy issue Full details: Docstring CoverageExplanation Docstring coverage is 17.12% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 146 functions across 53 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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In `@cpp/include/cudf/lists/stream_compaction.hpp`:
- Around line 60-68: Update the deprecated apply_boolean_mask declarations in
cpp/include/cudf/lists/stream_compaction.hpp lines 60-68 and
cpp/include/cudf/stream_compaction.hpp lines 220-227 to explicitly document the
boolean_mask parameter, replacing or supplementing the copied
apply_retention_mask documentation so no retention_mask reference remains for
these signatures.
- Around line 45-52: Update the Doxygen comments for the affected public API:
remove the unmatched backtick after the `@p` input parameter reference, and
describe the return value as a std::unique_ptr<column> rather than a table while
preserving the existing list-column behavior.
In `@cpp/include/cudf/stream_compaction.hpp`:
- Around line 203-212: The apply_mask implementation must enforce exact
retention_mask size equality for all inputs, including empty masks and zero-row
input tables. Move the size validation ahead of the empty-mask early return in
detail::apply_mask, preserving the existing filtering behavior only after sizes
match.
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cpp/benchmarks/filter/minmax_filter.cppcpp/benchmarks/ndsh/utilities.cppcpp/benchmarks/stream_compaction/apply_boolean_mask.cppcpp/include/cudf/detail/stream_compaction.hppcpp/include/cudf/lists/detail/stream_compaction.hppcpp/include/cudf/lists/stream_compaction.hppcpp/include/cudf/stream_compaction.hppcpp/libcudf_streaming/benchmarks/streaming/ndsh/q04.cppcpp/libcudf_streaming/benchmarks/streaming/ndsh/q09.cppcpp/libcudf_streaming/benchmarks/streaming/ndsh/q21.cppcpp/libcudf_streaming/src/bloom_filter.cppcpp/src/io/parquet/experimental/hybrid_scan_impl.hppcpp/src/io/parquet/experimental/hybrid_scan_preprocess.cucpp/src/join/sort_merge_join.cucpp/src/lists/stream_compaction/apply_boolean_mask.cucpp/src/stream_compaction/apply_boolean_mask.cucpp/tests/filter/filter_test.cppcpp/tests/io/experimental/hybrid_scan_filters_test.cppcpp/tests/io/experimental/hybrid_scan_test.cppcpp/tests/io/parquet_deletion_vectors_test.cppcpp/tests/io/parquet_reader_dict_test.cppcpp/tests/io/parquet_reader_test.cppcpp/tests/lists/stream_compaction/apply_boolean_mask_tests.cppcpp/tests/stream_compaction/apply_boolean_mask_tests.cppcpp/tests/streams/lists_test.cppcpp/tests/streams/stream_compaction_test.cppjava/src/main/native/src/TableJni.cpppython/cudf/cudf/core/column/categorical.pypython/cudf/cudf/core/column/column.pypython/cudf/cudf/core/column/datetime.pypython/cudf/cudf/core/column/numerical.pypython/cudf/cudf/core/column/string.pypython/cudf/cudf/core/indexed_frame.pypython/cudf/cudf/core/single_column_frame.pypython/cudf/cudf/core/tools/datetimes.pypython/cudf/cudf/testing/testing.pypython/cudf_polars/cudf_polars/containers/dataframe.pypython/cudf_polars/cudf_polars/dsl/expressions/selection.pypython/cudf_polars/cudf_polars/dsl/expressions/string.pypython/cudf_polars/cudf_polars/dsl/expressions/unary.pypython/pylibcudf/pylibcudf/libcudf/lists/stream_compaction.pxdpython/pylibcudf/pylibcudf/libcudf/stream_compaction.pxdpython/pylibcudf/pylibcudf/lists.pxdpython/pylibcudf/pylibcudf/lists.pyipython/pylibcudf/pylibcudf/lists.pyxpython/pylibcudf/pylibcudf/stream_compaction.pxdpython/pylibcudf/pylibcudf/stream_compaction.pyipython/pylibcudf/pylibcudf/stream_compaction.pyxpython/pylibcudf/tests/test_stream_compaction.py
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| * @throws cudf::logic_error if `input.num_rows() != retention_mask.size()`. | ||
| * @throws cudf::logic_error if @p retention_mask is not `type_id::BOOL8` type. | ||
| * | ||
| * @param[in] input The input table_view to filter | ||
| * @param[in] boolean_mask A nullable column_view of type type_id::BOOL8 used | ||
| * @param[in] retention_mask A nullable column_view of type type_id::BOOL8 used | ||
| * as a mask to filter the `input`. | ||
| * @param[in] stream CUDA stream used for device memory operations and kernel launches | ||
| * @param[in] mr Device memory resource used to allocate the returned table's device memory | ||
| * @return Table containing copy of all rows of @p input passing | ||
| * the filter defined by @p boolean_mask. | ||
| * @return Table containing copy of all rows of @p input passing the filter defined by | ||
| * @p retention_mask. |
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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win
Make the size-validation contract match the implementation.
Line 203 states that every size mismatch raises cudf::logic_error. However, detail::apply_mask in cpp/src/stream_compaction/apply_boolean_mask.cu returns before validation when the mask is empty, and it accepts any mask size when input.num_rows() is zero. A one-row table with an empty mask therefore returns an empty table instead of raising.
Validate exact size equality before the empty-mask shortcut, or document these compatibility exceptions.
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In `@cpp/include/cudf/stream_compaction.hpp` around lines 203 - 212, The
apply_mask implementation must enforce exact retention_mask size equality for
all inputs, including empty masks and zero-row input tables. Move the size
validation ahead of the empty-mask early return in detail::apply_mask,
preserving the existing filtering behavior only after sizes match.
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This needs to be documented, not fixed.
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@igorpeshansky, agreed. The implementation behavior should remain unchanged.
Please document the exceptions to the size-validation rule for apply_retention_mask:
- An empty
retention_maskreturns an empty table. - A zero-row
inputreturns an empty table regardless ofretention_mask.size().
This makes the public API contract match the existing compatibility behavior.
🐇
✏️ Learnings added
Learnt from: igorpeshansky
Repo: NVIDIA/cudf PR: 23700
File: cpp/include/cudf/stream_compaction.hpp:203-212
Timestamp: 2026-08-25T18:32:40.941Z
Learning: For the C++ `cudf::apply_retention_mask` API in `cpp/include/cudf/stream_compaction.hpp`, preserve the existing empty-mask and zero-row-input behavior. Document these size-validation exceptions instead of changing `detail::apply_mask` to enforce exact mask-size equality in those cases.
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[Really optional] Pre-dates this PR, but apply_deletion_mask has the same issue with its @note and size @throws docs below, so could get the same fix.
[Really really optional] As an aside, I've also noticed a behavioral quirk, where apply_deletion_mask would actually delete everything (i.e., return an empty table) when the deletion mask is empty, due to the early return in apply_mask — I would've thought "delete nothing" would be a more natural behavior. I don't know if that was the intended consequence (the ApplyDeletionMask.EmptyMask test seems to codify it), but might be worth a follow-up issue… Leaving unresolved for @vyasr to chime in here as well.
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I would've thought "delete nothing" would be a more natural behavior. I don't know if that was the intended consequence (the ApplyDeletionMask.EmptyMask test seems to codify it)
@igorpeshansky I think we can fix this in a follow up PR (to limit the scope here). I think it may be remnant of the mask type policy. For retentions, it makes sense to delete everything if the mask is empty and the same may have been spilled over without a check.
Updated: Created a draft PR #23857 that fixes this. Thanks for pointing it out. The draft PR contains changes from this PR as well that will go away when we merge this one.
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I also want to flag coderabbit's #23700 (comment).
BTW, should this be labeled non-breaking per cpp/doxygen/developer_guide/DEVELOPER_GUIDE.md?
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mhaseeb123
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Addressed the flagged CodeRabbit documentation finding in 2c2a981 and updated the PR label to |
| * @throws cudf::logic_error if `input.num_rows() != retention_mask.size()`. | ||
| * @throws cudf::logic_error if @p retention_mask is not `type_id::BOOL8` type. | ||
| * | ||
| * @param[in] input The input table_view to filter | ||
| * @param[in] boolean_mask A nullable column_view of type type_id::BOOL8 used | ||
| * @param[in] retention_mask A nullable column_view of type type_id::BOOL8 used | ||
| * as a mask to filter the `input`. | ||
| * @param[in] stream CUDA stream used for device memory operations and kernel launches | ||
| * @param[in] mr Device memory resource used to allocate the returned table's device memory | ||
| * @return Table containing copy of all rows of @p input passing | ||
| * the filter defined by @p boolean_mask. | ||
| * @return Table containing copy of all rows of @p input passing the filter defined by | ||
| * @p retention_mask. |
There was a problem hiding this comment.
[Really optional] Pre-dates this PR, but apply_deletion_mask has the same issue with its @note and size @throws docs below, so could get the same fix.
[Really really optional] As an aside, I've also noticed a behavioral quirk, where apply_deletion_mask would actually delete everything (i.e., return an empty table) when the deletion mask is empty, due to the early return in apply_mask — I would've thought "delete nothing" would be a more natural behavior. I don't know if that was the intended consequence (the ApplyDeletionMask.EmptyMask test seems to codify it), but might be worth a follow-up issue… Leaving unresolved for @vyasr to chime in here as well.
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LGTM 
modulo a couple of unresolved comments where we're waiting on input from @vyasr.
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- Fix Java indentation in applyRetentionMask Javadoc example - Remove unused native applyBooleanMask JNI overload and implementation - Fix lists.pyx docstring indentation for return value - Improve stream_compaction.pyx docstring wording for apply_retention_mask - Fix apply_deletion_mask docs (@note and @throws) to match actual behavior - Migrate apply_retention_mask to cuda::stream_ref (merge conflict from NVIDIA#23691) - Add comment in sort_merge_join.cu explaining use of internal apply_mask
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Description
Closes #22219
This PR adds a new API
apply_retention_maskto replaceapply_boolean_maskfor consistent naming (retentions and deletions). There's no logical changes between the APIs whatsoever.Checklist