feat: Add schema diff data structures and foundation (1/5) #1477
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Introduces core data structures for schema diffing: - SchemaDiff, FieldChange, FieldUpdate types - FieldChangeType enum for classifying changes - SchemaDiffError for validation errors - ColumnName::parent() helper method This is part 1/5 of the schema diffing feature implementation. The actual diffing algorithm will be added in PR 2. Note: This PR includes a temporary stub for compute_schema_diff() to allow basic tests to compile. The full implementation from the original PR delta-io#1346 will be copied exactly in PR 2. Related to delta-io#1346
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #1477 +/- ##
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+ Coverage 84.84% 84.89% +0.05%
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Files 120 121 +1
Lines 32103 32262 +159
Branches 32103 32262 +159
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+ Hits 27238 27390 +152
- Misses 3542 3547 +5
- Partials 1323 1325 +2 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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This was referenced Nov 14, 2025
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Adds a comprehensive unit test that exercises the filtering logic by manually constructing a SchemaDiff with both top-level and nested field changes. This test verifies that the methods correctly filter fields by path depth (length 1 vs length > 1). The test improves code coverage for these methods from 0% to full coverage of the filtering logic, addressing CI coverage requirements.
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OussamaSaoudi
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Nov 15, 2025
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This is part 1 of 5 PRs that implement schema diffing for Delta Kernel Rust.
What's in this PR
SchemaDiff,FieldChange,FieldUpdateFieldChangeTypeenum for classifying changesSchemaDiffErrorfor validation errorsColumnName::parent()helper methodWhat's NOT in this PR
Feature Gating
This PR includes
const SCHEMA_DIFF_ENABLED: bool = falsewith a#[cfg(not(test))]guard.Part of #1346