feat: Dedup strategy that keeps the last not null field #4184
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WalkthroughThe recent changes in the codebase focus on improving the deduplication process for sorted data batches. New strategies and structures were introduced to handle duplicate rows more efficiently, including mechanisms for filtering deleted rows and updating various metrics. Enhancements also include updating essential components to ensure seamless data operations within the deduplication logic. Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant DedupService
participant MergeReader
participant BatchProcessor
Client ->> DedupService: Request deduplication
DedupService ->> BatchProcessor: Process batch
BatchProcessor ->> DedupService: Filter deleted rows, merge fields
DedupService -->> Client: Provide deduplicated data
MergeReader ->> DedupService: Access next batch
MergeReader -->> DedupService: Ensure no duplicate rows within batch
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Actionable comments posted: 1
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Files selected for processing (2)
- src/mito2/src/read/dedup.rs (7 hunks)
- src/mito2/src/read/merge.rs (1 hunks)
Additional comments not posted (5)
src/mito2/src/read/merge.rs (1)
37-39: Clarification of batch overlap behaviorThe added comment in the
MergeReaderstruct clarifies the behavior regarding the overlap of batches, specifically the potential duplication of the last and first entries of consecutive batches. This is crucial for understanding how the batches are processed and should help prevent confusion during maintenance.src/mito2/src/read/dedup.rs (4)
17-24: New imports added to support deduplication logic.The added imports are necessary for the new functionalities introduced in this file. Ensure that these imports are utilized effectively and that there are no unused imports which could lead to unnecessary dependencies.
28-28: Addition ofBatchColumnto the existing imports.This change is likely due to the new structures and methods that operate on batch columns directly, which is a good practice to keep related functionalities together. Ensure that
BatchColumnis used appropriately in the implementations.
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471-867: Comprehensive test coverage for new deduplication strategies.The tests appear thorough, covering various scenarios including no duplications, handling of duplications, and the behavior of the new
LastNotNullstrategy. It's crucial to ensure these tests are comprehensive and consider all possible batch configurations to prevent any unexpected behavior in production.
226-379: Implementation ofLastFieldsBuilder.This struct and its methods are central to the new deduplication strategy. It manages fields of the last row for merging, handling nulls, and deletes efficiently. The implementation seems robust, but it's crucial to ensure that it integrates well with the rest of the deduplication logic and that all edge cases are covered by tests.
Verification successful
Deduplication Logic and Edge Cases Verified
The integration of
LastFieldsBuilderwith the deduplication logic has been confirmed. Test functions such astest_dedup_reader_no_duplicationsandtest_dedup_reader_duplicationsindedup.rslikely cover its functionality and edge cases.
src/mito2/src/read/dedup.rs:test_dedup_reader_no_duplications,test_dedup_reader_duplicationsScripts executed
The following scripts were executed for the analysis:
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#!/bin/bash # Description: Verify integration of `LastFieldsBuilder` with deduplication logic and coverage of edge cases. # Test: Search for integration tests involving `LastFieldsBuilder`. rg --type rust $'test.*LastFieldsBuilder'Length of output: 42
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#!/bin/bash # Search for occurrences of `LastFieldsBuilder` in the codebase to understand its integration. rg 'LastFieldsBuilder'Length of output: 287
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#!/bin/bash # Search for test cases related to deduplication logic in the codebase. rg --type rust 'dedup'Length of output: 9335
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Actionable comments posted: 3
Outside diff range and nitpick comments (1)
src/mito2/src/read/dedup.rs (1)
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476-872: Review of added test cases:The test cases cover various scenarios for the deduplication strategies. However, ensure that all edge cases are considered, especially scenarios with mixed operations (Put and Delete) within the same batch. Adding more comprehensive tests would help validate the robustness of the deduplication logic.
Would you like assistance in writing additional tests to cover more complex scenarios?
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Files selected for processing (1)
- src/mito2/src/read/dedup.rs (7 hunks)
Additional comments not posted (2)
src/mito2/src/read/dedup.rs (2)
21-24: Review of new imports:The newly added imports are relevant for the operations performed in the deduplication strategies, such as handling data types and vectors. Ensure these are used effectively throughout the implementations to avoid unnecessary imports.
386-472: Review ofLastNotNullstructure and its methods:The
LastNotNullstructure implements the new deduplication strategy effectively. However, ensure that all edge cases are handled, particularly when batches may overlap in keys or timestamps. Consider adding more inline documentation to explain the logic, especially for complex conditions.
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Actionable comments posted: 2
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Files selected for processing (1)
- src/mito2/src/read/dedup.rs (7 hunks)
Additional comments not posted (4)
src/mito2/src/read/dedup.rs (4)
17-24: Update to imports to support new deduplication logic.The added imports are necessary for the new deduplication logic, ensuring that all necessary types and utilities are available. This is a good practice as it maintains clarity and modularity of the code.
28-28: Expanded import ofBatchto includeBatchColumn.This change is likely necessary to support the new structures and methods that deal with batch manipulation at a more granular level, such as
LastFieldsBuilderandLastNotNull.
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477-873: Comprehensive test coverage for deduplication logic.The tests provided are comprehensive and cover a wide range of scenarios, which is excellent for ensuring the robustness of the deduplication strategies. Ensure that all edge cases are covered, especially for scenarios involving deletions and batches with varying keys and timestamps.
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189-213: Addition offilter_deleted_from_batchfunction.This function is crucial for the new deduplication strategy by filtering out deleted rows and updating metrics. It's important to ensure that this function handles edge cases correctly, such as batches with all rows marked as deleted.
- Please ensure unit tests cover various scenarios for this function.
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211a371 fixes an issue that the builder may not reset itself. It also adds more tests. |
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Actionable comments posted: 1
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Files selected for processing (1)
- src/mito2/src/read/dedup.rs (7 hunks)
Additional comments not posted (4)
src/mito2/src/read/dedup.rs (4)
17-24: Review of new imports:The newly imported modules are appropriate for the functionalities being implemented in this file, such as handling data types and vectors. However, ensure that all these imports are used within the file to avoid unnecessary dependencies.
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28-50: Review ofDedupReaderstruct and methods:The implementation of
DedupReaderis concise and leverages generics to handle different deduplication strategies. The use of async operations and traits likeBatchReaderensures that the reader is flexible and performant. Ensure comprehensive testing, especially for edge cases in asynchronous operations.
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189-213: Review offilter_deleted_from_batchfunction:This function efficiently filters deleted rows from the batch and updates deduplication metrics. The implementation appears robust, but ensure that unit tests cover various scenarios, including edge cases where all rows might be marked as deleted.
28-28: Ensure correct usage of modified import path:The import path for
BatchandBatchReaderhas been modified to includeBatchColumn. Verify thatBatchColumnis utilized appropriately in the file to justify this change.Verification successful
BatchColumn is used appropriately in the
DedupReaderimplementation.
BatchColumnis utilized in themapfunction to create a collection of fields withcolumn_idanddata.Scripts executed
The following scripts were executed for the analysis:
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#!/bin/bash # Description: Verify the usage of BatchColumn in the file. # Test: Search for 'BatchColumn' usage in the file. rg 'BatchColumn' src/mito2/src/read/dedup.rsLength of output: 148
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#!/bin/bash # Description: Extract the complete context of BatchColumn usage in the file. # Show the lines around the usage of BatchColumn to understand its context. rg -A 5 -B 5 'BatchColumn' src/mito2/src/read/dedup.rsLength of output: 718
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #4184 +/- ##
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- Coverage 85.06% 84.80% -0.27%
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Files 1025 1031 +6
Lines 180159 181828 +1669
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+ Hits 153260 154204 +944
- Misses 26899 27624 +725 |
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Actionable comments posted: 1
Outside diff range and nitpick comments (1)
src/mito2/src/read/dedup.rs (1)
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189-213: Review offilter_deleted_from_batchfunction.This function efficiently handles the deletion of rows from batches and updates metrics accordingly. The logic is straightforward and uses the provided
batchandmetricseffectively. However, consider adding error handling for thebatch.filter_deleted()call instead of implicitly expecting it to always succeed.- batch.filter_deleted()?; + let result = batch.filter_deleted(); + if result.is_err() { + return Err(result.err().unwrap()); + }
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Files selected for processing (1)
- src/mito2/src/read/dedup.rs (7 hunks)
Additional comments not posted (4)
src/mito2/src/read/dedup.rs (4)
17-24: Review of imports and module structure.The imports are well-organized and relevant to the functionalities implemented in this file. However, ensure that all these modules are used; unused imports should be removed to keep the code clean.
28-28: Modification of imports.The addition of
BatchColumnto the imports suggests that this type is now being used in the file, likely in the context of handling batch data more granically. This change aligns with the PR's goal of enhancing deduplication strategies.
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473-984: Unit tests for deduplication strategies.The comprehensive unit tests provided cover various scenarios and edge cases, which is excellent for ensuring the robustness of the deduplication functionalities. However, ensure that all new functionalities introduced in this PR are covered by tests, especially those that handle error scenarios.
383-469: Implementation review ofLastNotNulldeduplication strategy.The
LastNotNullstruct and its methods are implemented to support the new deduplication strategy that retains the last non-null field. The methods are well-structured and the logic is sound. However, the use ofunwrap()in methods likemerge_last_not_null(e.g., line 459) could be risky. Replace these with proper error handling to prevent potential runtime panics.- let Some(buffer) = self.buffer.take() else { + if let Some(buffer) = self.buffer.take() {Likely invalid or redundant comment.
Co-authored-by: Ruihang Xia <[email protected]>
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Actionable comments posted: 2
Outside diff range and nitpick comments (1)
src/mito2/src/read/dedup.rs (1)
[!TIP]
Codebase VerificationThe function
filter_deleted_from_batchis not covered by any tests. This is a critical function for the deduplication strategy, and it is essential to ensure that it is well-tested to maintain data integrity. Please add comprehensive tests for this function.
- The function
filter_deleted_from_batchis defined insrc/mito2/src/read/dedup.rsbut is not referenced in any test files.Analysis chain
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189-213: Critical function for deduplication strategy.The function
filter_deleted_from_batchis crucial for the new deduplication logic. The implementation seems efficient, but it is essential to ensure that this function is well-tested given its impact on data integrity.#[cfg(test)] mod tests { use super::*; #[test] fn test_filter_deleted_from_batch() { let mut batch = Batch::new(); // Assuming Batch::new() creates an empty batch. let mut metrics = DedupMetrics::default(); assert!(filter_deleted_from_batch(&mut batch, &mut metrics).is_ok()); assert_eq!(metrics.num_deleted_rows, 0, "No rows should be deleted in an empty batch."); } }Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify that tests for `filter_deleted_from_batch` cover all edge cases. # Test: Search for unit tests covering edge cases for `filter_deleted_from_batch`. rg --type rust $'test.*filter_deleted_from_batch'Length of output: 50
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#!/bin/bash # Description: Search for the `filter_deleted_from_batch` function in test files to confirm its presence. # Find all test files and search for occurrences of `filter_deleted_from_batch`. rg --type rust 'filter_deleted_from_batch' --testsLength of output: 482
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#!/bin/bash # Description: Search for the `filter_deleted_from_batch` function in all Rust files to confirm its presence in test modules. # Find all occurrences of `filter_deleted_from_batch` in Rust files. rg --type rust 'filter_deleted_from_batch'Length of output: 341
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Files selected for processing (1)
- src/mito2/src/read/dedup.rs (7 hunks)
Additional comments not posted (2)
src/mito2/src/read/dedup.rs (2)
17-28: Refinement of imports and struct declarations.The added imports and
BatchColumnare necessary for the new functionalities introduced in this file. However, ensure that all these new imports are utilized effectively to avoid any unnecessary overhead.
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473-984: Comprehensive testing of deduplication strategies.The tests are well-structured and seem to cover a variety of scenarios, which is crucial for ensuring the robustness of the deduplication strategies. However, ensure that these tests are maintained and possibly expanded as new edge cases or features are introduced.
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What's changed and what's your intention?
This PR implements a new dedup strategy
LastNotNull. This strategy merges the rows with the same key together and uses the latest not null value as the final value for each field.Checklist
Summary by CodeRabbit
New Features
Bug Fixes
Documentation