[ptomecek]

Description

Two small Python 3.14 / dependency compatibility fixes.

1. Stable cache keys across processes on Python 3.14. PEP 649 attaches an auto-generated __annotate__ (and __annotate_func__) to every annotated class. ccflow's cache-key machinery computes a behavior token by hashing class method bytecode, so it hashed the __annotate__ closure, whose cells are PYTHONHASHSEED-sensitive. The behavior token, and the cache keys derived from it, then differed from one process to the next. Fix: add __annotate__/__annotate_func__ to _SKIPPED_METHODS in ccflow/utils/tokenize.py. Annotations are already captured through other paths, so excluding these is lossless for the cache contract. A regression test injects __annotate__ manually so it also runs on pre-3.14 interpreters.

2. duckdb 2.0 compatibility in the TPC-H example. duckdb 2.0 removed fetchone() from the relation returned by Connection.query(). Switch to relation.fetchall() (duckdb's recommended replacement), which exists on both old and new duckdb and fully drains the result so the shared connection stays usable for the next query. Validated against duckdb 2.0.0 and 1.4.0.

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup
• CI / build configuration
• Other (describe below)

Checklist

• Linting passes (make lint)
• Tests pass (make test)
• New tests added for new functionality
• Documentation updated (if applicable)
• Changelog / version bump (if applicable)

[github-actions]

Test Results

    1 files  ±0      1 suites  ±0   1m 59s ⏱️ -20s
1 557 tests +1  1 552 ✅  - 2  5 💤 +3  0 ❌ ±0 
1 623 runs  +1  1 618 ✅  - 2  5 💤 +3  0 ❌ ±0 

Results for commit ef7a019. ± Comparison against base commit ea121bd.

This pull request skips 4 and un-skips 1 tests.

ccflow.tests.enums.test_pydantic ‑ test_json_schema_csp
ccflow.tests.examples.test_calculator.TestCalculatorCli ‑ test_cli
ccflow.tests.examples.test_etl.TestEtl ‑ test_cli
ccflow.tests.utils.test_tokenize.TestAdversarialFixes ‑ test_function_docstring_still_stripped

ccflow.tests.enums.test_pydantic ‑ test_json_schema_no_csp

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.84%. Comparing base (ea121bd) to head (ef7a019).

Files with missing lines	Patch %	Lines
ccflow/tests/utils/test_tokenize.py	75.00%	3 Missing ⚠️
ccflow/examples/tpch/data_generators.py	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #282      +/-   ##
==========================================
- Coverage   93.87%   93.84%   -0.03%     
==========================================
  Files         202      202              
  Lines       22457    22469      +12     
  Branches     1457     1457              
==========================================
+ Hits        21081    21086       +5     
- Misses       1091     1096       +5     
- Partials      285      287       +2     

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