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chore(spanner): clean up chunked value merging - #7150
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Code Review
This pull request refactors the merge_values function in result_set.rs to optimize the merging of ListValue types by using an iterator instead of remove(0), which avoids O(N) shifts. It also introduces a comprehensive suite of acceptance and unit tests for streaming reads and chunked values, supported by a new JSON test data file. Feedback suggests using .expect() instead of if let Some when retrieving the last element of target_list.values to explicitly assert the non-empty invariant and reduce nesting.
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Clean up and optimize chunked result set merging in Cloud Spanner and add comprehensive golden acceptance and unit test coverage. What changed: - Value merging cleanup: Refactored merge_values in result_set.rs to consume source list values via an iterator instead of calling remove(0) (avoiding O(N) memory copies on every chunk), and eliminated an unreachable dead-code branch. - Wire protocol verification: Confirmed that array element boundary concatenation is intended Spanner wire protocol behavior, and that SQL STRUCT values are transmitted as ListValue over the wire (making StructValue merge logic dead code). - Acceptance tests: Added the 18 golden acceptance test scenarios from the Spanner specification (in streaming_read_acceptance_test.json) covering string, numeric, integer, float, json, and nested struct array chunking. - Edge case unit tests: Added targeted unit tests for empty string prefixes, empty list head/tail merges, base64 BYTES / ARRAY<BYTES> splits, intermediate single-value chunks, and stream resumption with retry tokens mid-chunk for both scalar and array values.
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Code Review
This pull request refactors the merge_values function in result_set.rs to optimize the merging of chunked ListValue types by using an iterator instead of an expensive remove(0) operation. It also cleans up imports and variable names for better readability. Additionally, a comprehensive suite of unit and acceptance tests has been added, including a new JSON-based test suite (streaming_read_acceptance_test.json) to validate various chunking and merging scenarios such as empty strings, nested structs, retries with resume tokens, and incompatible type errors. There are no review comments, and the changes look excellent, so I have no further feedback to provide.
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| let source_first = source_list.values.remove(0); | ||
| if let Some(target_last) = target_list.values.last_mut() { | ||
| let mut source_iterator = source_list.values.into_iter(); |
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This is a small optimization to prevent O(N) memory copies on every chunk
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #7150 +/- ##
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Coverage 97.34% 97.35%
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Files 327 327
Lines 127848 128475 +627
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+ Hits 124452 125075 +623
- Misses 3396 3400 +4 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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Clean up and optimize chunked result set merging in Cloud Spanner and add comprehensive golden acceptance and unit test coverage.
What changed: