⚡️ Speed up method `DbtAdapter.build_parent_map` by 3,421%

[misrasaurabh1]

📄 3,421% (34.21x) speedup for DbtAdapter.build_parent_map in recce/adapter/dbt_adapter/__init__.py

⏱️ Runtime : 41.5 milliseconds → 1.18 milliseconds (best of 21 runs)

📝 Explanation and details

The optimized code achieves a dramatic 3420% speedup by addressing two critical performance bottlenecks:

Primary Optimization: Avoiding expensive to_dict() conversion

• The original code calls manifest.to_dict() which consumes 98.4% of the total runtime (499ms out of 507ms)
• The optimized version attempts to access manifest.parent_map directly, falling back to to_dict() only if needed
• This eliminates the massive serialization overhead when the parent_map is already available as an attribute

Secondary Optimization: Converting to set for O(1) lookups

• Changes node_ids = nodes.keys() to node_ids = set(nodes)
• Set membership tests (if k not in node_ids) are O(1) instead of O(n) for dict_keys views
• While this optimization shows smaller gains in the profiler, it provides consistent performance improvements for larger node sets

Performance Impact:

• Total runtime drops from 41.5ms to 1.18ms
• The manifest.to_dict() bottleneck is completely eliminated in the common case
• Set-based membership checks are more efficient, especially as the number of nodes scales

Test Case Benefits: The optimizations are particularly effective for:

• Large dbt projects with many nodes (where set lookups show greater advantage)
• Repeated calls to build_parent_map (avoiding repeated expensive dict conversions)
• Any scenario where the manifest object already has a parent_map attribute available

The try/except ensures backward compatibility while maximizing performance gains in the common case.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	🔘 None Found
⏪ Replay Tests	✅ 34 Passed
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

⏪ Replay Tests and Runtime

Test File::Test Function	Original ⏱️	Optimized ⏱️	Speedup
test_pytest_tests__replay_test_0.py::test_recce_adapter_dbt_adapter___init___DbtAdapter_build_parent_map	40.7ms	233μs	17297%✅

To edit these changes git checkout codeflash/optimize-DbtAdapter.build_parent_map-med9gwbs and push.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
recce/adapter/dbt_adapter/__init__.py	66.66%	2 Missing :warning:

Files with missing lines	Coverage Δ
recce/adapter/dbt_adapter/__init__.py	74.09% <66.66%> (-0.12%)	:arrow_down:

... and 9 files with indirect coverage changes

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[misrasaurabh1]

should be ready to merge

[wcchang1115]

Hi misrasaurabh1, I would prefer to keep the node_ids = nodes.keys() as is for readability. Could you please help edit it and fix the failed CI jobs? thanks!

And we need a sign-off in the commit messages to pass the DCO check. You could provide your commit with git commit --signoff or git commit -s

Thanks!