codec(ticdc): support header line for CSV protocol #12183
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Summary of Changes
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This PR, authored by wk989898, addresses issue #12179 by adding support for including a header line in the CSV output protocol. Previously, the CSV sink only output data rows. This change introduces a new configuration option that allows users to specify whether a header row containing column names should be included in the output.
Highlights
- New Configuration Option: A new boolean configuration option,
output-field-header, is added to the CSV sink configuration. When set totrue, the CSV output will include a header row. - CSV Encoder Update: The CSV encoder logic is updated to check the new
CSVOutputFieldHeaderconfiguration. If enabled and it's the first batch being processed, it generates and writes a header row before the data rows. - Header Generation Logic: A new function
encodeHeaderis introduced to construct the header string. This function dynamically builds the header based on other CSV configuration options likeinclude-commit-tsandoutput-old-value, ensuring the header matches the structure of the data rows (e.g., including 'commit-ts' or 'is-update' columns if those options are enabled). - Unit Tests: New unit tests are added to verify the behavior of the CSV encoder and the
encodeHeaderfunction when the header option is enabled and disabled.
Changelog
Click here to see the changelog
- pkg/config/sink.go
- Added
OutputFieldHeaderboolean field to theCSVConfigstruct (lines 263-264).
- Added
- pkg/sink/codec/common/config.go
- Added
CSVOutputFieldHeaderboolean field to theConfigstruct, specific to CSV (lines 92-93). - Initialized
CSVOutputFieldHeadertofalseinNewConfig(lines 134). - Applied the value from
replicaConfig.Sink.CSVConfig.OutputFieldHeaderto the commonConfigin theApplymethod (lines 239).
- Added
- pkg/sink/codec/csv/csv_decoder.go
- Passed the
codecConfig.CSVOutputFieldHeadervalue to theHeaderfield of themydump.CSVConfigwhen creating the CSV parser (lines 60).
- Passed the
- pkg/sink/codec/csv/csv_encoder.go
- Added logic in
AppendTxnEventto checkb.config.CSVOutputFieldHeaderandb.batchSize == 0. If true, it generates the header usingencodeHeaderand writes it to the buffer before processing rows (lines 39-52).
- Added logic in
- pkg/sink/codec/csv/csv_encoder_test.go
- Imported the
stringspackage (lines 17). - Added
TestCSVBatchCodecWithHeaderto test the encoder's behavior with and without the header option, including checking the generated header content (lines 107-156).
- Imported the
- pkg/sink/codec/csv/csv_message.go
- Updated comments describing the column order in the CSV output format (lines 103).
- Changed the return type of
encode()to usecommon.UnsafeStringToBytesfor potential performance improvement (lines 120). - Added the
encodeHeaderfunction to generate the CSV header row based on configuration and column names (lines 494-517).
- pkg/sink/codec/csv/csv_message_test.go
- Added
TestEncodeHeaderto specifically test theencodeHeaderfunction with various configuration combinations (lines 1105-1134).
- Added
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CSV, comma-split,
A header now can sit,
Data flows just right.
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Code Review
This PR introduces the output-field-header option for the CSV protocol, allowing a header line to be included in the output. The changes span configuration, encoding, and decoding aspects.
While the core idea is well-implemented and basic unit tests are in place, there's a critical issue with how header column names are derived, which can lead to incorrect headers when certain features like only-output-updated-columns are enabled. Additionally, integration test coverage for this new feature is currently missing.
The use of common.UnsafeStringToBytes is noted for performance but should always be handled with care, ensuring the lifetime of the underlying data is managed correctly (which appears to be the case here). A minor potential optimization could be caching generated headers if schemas are stable and batches are small, but this is not a primary concern.
Summary of Findings
- Header Column Derivation: The logic for generating header column names in
pkg/sink/codec/csv/csv_encoder.goincorrectly bases them on the columns present in the first event of a batch. This can lead to headers that don't match the full schema or subsequent data rows, especially whenonly-output-updated-columnsis true. This is a high-severity issue. - Integration Test Coverage: The new
output-field-headerfeature is not currently covered by any integration tests. An existing test should be modified or a new one added to validate this feature end-to-end. This is a medium-severity issue. - PR Description: The 'What is changed and how it works?' section of the pull request description is empty. Filling this out would improve context for reviewers and future maintainers. (Severity: Low, not commented in-line)
- Unsafe Code Usage: The use of
common.UnsafeStringToBytesinpkg/sink/codec/csv/csv_message.gois noted. While it appears safe in the current context (asstrBuilder.String()creates a new string whose data is immediately converted to a byte slice),unsafeoperations always require careful consideration of memory and object lifetimes. (Severity: Low, not commented in-line)
Merge Readiness
The pull request introduces a useful feature for CSV output. However, due to the high-severity issue identified in header column generation and the medium-severity concern regarding missing integration test coverage, I recommend that these changes not be merged until these points are addressed. Addressing the PR description would also be beneficial. I am unable to approve the pull request; please ensure these changes are reviewed and approved by others before merging.
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Codecov Report❌ Patch coverage is Additional details and impacted files
Flags with carried forward coverage won't be shown. Click here to find out more. @@ Coverage Diff @@
## master #12183 +/- ##
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+ Coverage 55.0602% 55.0624% +0.0022%
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Files 1030 1030
Lines 143225 143290 +65
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+ Hits 78860 78899 +39
- Misses 58570 58592 +22
- Partials 5795 5799 +4 🚀 New features to boost your workflow:
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/test pull-cdc-integration-storage-test |
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/cc @benmeadowcroft |
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@benmeadowcroft PTAL. |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: 3AceShowHand, benmeadowcroft, hongyunyan The full list of commands accepted by this bot can be found here. The pull request process is described here DetailsNeeds approval from an approver in each of these files:
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5 participants
What problem does this PR solve?
Issue Number: close #12179
What is changed and how it works?
OutputFieldHeader.message.KeywhenOutputFieldHeader=truesincemessage.Keyis never used before.Header
Check List
Tests
Questions
Will it cause performance regression or break compatibility?
Do you need to update user documentation, design documentation or monitoring documentation?
Release note