ComparePerformance: fix crash in RTJO mode #3923
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With `--dynamic-join-order-mode=all`, both `first` and `second` are undefined, leading to a crash. Until RTJO mode gets proper tuple counting, this change prevents a crash when unfurling the steps of a predicate.
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PR Overview
This PR addresses a crash in RTJO mode by ensuring that when both "first" and "second" are undefined, the code safely defaults to an empty array instead of attempting to access a property on an undefined object. Key changes include updating the default for steps in the predicate row component to prevent a crash.
- Replace non-null assertion on "second" with safe optional chaining.
- Provide an empty array as fallback to ensure safe iteration with map.
Changes
| File | Description |
|---|---|
| extensions/ql-vscode/src/view/compare-performance/ComparePerformance.tsx | Updated the steps extraction to safely handle undefined values and prevent a crash in RTJO mode |
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extensions/ql-vscode/src/view/compare-performance/ComparePerformance.tsx:801
- Ensure that using an empty array as the default value for steps covers all expected cases, and consider adding an inline comment to explain why the empty array fallback is necessary to prevent crashes when both 'first' and 'second' are undefined.
{abbreviateRASteps(first?.steps ?? second?.steps ?? []).map(
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asgerf
reviewed
Feb 11, 2025
koesie10
approved these changes
Feb 11, 2025
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With
--dynamic-join-order-mode=all, bothfirstandsecondareundefined, leading to a crash. Until RTJO mode gets proper tuple
counting, this change prevents a crash when unfurling the steps of a
predicate.