Skip code coverage where dynamic predicates are dropped

[Matt711]

Description

The original test I added in #22820 does not produce the dynamic predicate on the same side of the filter determinitically.

import polars as pl

df = pl.LazyFrame({"a": [1, 2, 3, 4, 5], "b": [5, 4, 3, 2, 1], "c": [1, 1, 3, 3, 5]})
q = df.filter((pl.col("a") > 1) & (pl.col("c") == 3)).sort("b").head(3)

Inspect the logical plan on successive calls to explain()

SORT BY [slice: (0, 3, dynamic_pred: c6412d2b-fd62-4ecb-b5fc-c575f7fe4411)] [col("b")]
  FILTER [([(col("b").dynamic_predicate()) & ([(col("a")) > (1)])]) & ([(col("c")) == (3)])]
  FROM
    DF ["a", "b", "c"]; PROJECT */3 COLUMNS

SORT BY [slice: (0, 3, dynamic_pred: 347e337d-20db-4311-900f-53d387531102)] [col("b")]
  FILTER [([([(col("a")) > (1)]) & ([(col("c")) == (3)])]) & (col("b").dynamic_predicate())]
  FROM
    DF ["a", "b", "c"]; PROJECT */3 COLUMNS

So this PR skips code coverage to avoid this nondeterminism. We could write a hacky test to without sacrificing code coverage, but it's not worth it IMO.

Checklist

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

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 89e4ecc and 3ceb789.

📒 Files selected for processing (2)

• python/cudf_polars/cudf_polars/dsl/translate.py
• python/cudf_polars/tests/test_filter.py

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📝 Walkthrough

Summary by CodeRabbit

• Documentation
  • Added clarifying comments about how dynamic predicate handling behaves in filter logic.
• Chores
  • Updated the copyright notice in a test file.

Walkthrough

Adds explanatory comments in _drop_dyn_pred_hints about nondeterministic AND-tree branch pruning, and updates the SPDX copyright header in python/cudf_polars/tests/test_filter.py.

Changes

Dynamic predicate hint comments

Layer / File(s)	Summary
Branch selection comments python/cudf_polars/cudf_polars/dsl/translate.py	Adds comments explaining which AND branch survives when _drop_dyn_pred_hints returns the non-None side.

SPDX header update

Layer / File(s)	Summary
Header text update python/cudf_polars/tests/test_filter.py	Appends “All rights reserved.” to the SPDX-FileCopyrightText comment.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• rapidsai/cudf#22820: Shares the same dynamic-predicate hint dropping logic referenced by the translate.py comment change.

Suggested labels

Python, cudf-polars

Suggested reviewers

• nirandaperera
• TomAugspurger

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: skipping coverage for nondeterministic dynamic-predicate drops.
Description check	✅ Passed	The description directly explains the nondeterministic dynamic-predicate issue and the resulting test coverage skip.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[TomAugspurger]

Thanks! I got very about how this could fail while looking into this yesterday.

I merged main now that #22979 is in.

[Matt711]

/merge