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feat: the source and sink APIs of Flink-lance have been refactored(FLIP-143/FLIP-27)#15

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feat: the source and sink APIs of Flink-lance have been refactored(FLIP-143/FLIP-27)#15
fightBoxing wants to merge 9 commits intomainfrom
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@fightBoxing fightBoxing commented Feb 11, 2026

  • Based on the trino-lance plugin, the source and sink APIs of Flink-lance have been refactored.

  • code architecture diagram

Clipboard_Screenshot_1770775901

  • Implementation details

    • Migrate Source from RichParallelSourceFunction to Source V2 API (FLIP-27)

      • Add LanceSource, LanceSourceReader, LanceSplitEnumerator
      • Add LanceSourceSplit, LanceEnumeratorState with serializers
      • Support checkpoint/recovery, parallel split assignment
      • Update LanceDynamicTableSource to use SourceProvider

    • Migrate Sink from RichSinkFunction to Sink V2 API (FLIP-143)

      • Add LanceSink, LanceSinkWriter
      • Support APPEND and OVERWRITE write modes
      • Support checkpoint flush and auto batch flush
      • Update LanceDynamicTableSink to use SinkV2Provider
      • Fix Append mode missing read_version parameter bug

    • Add comprehensive unit tests

      • LanceSourceV2Test: 23 tests covering Split, Serializer, State, Source
      • LanceSinkV2Test: 13 tests covering Writer, write modes, checkpoint

rockyyin added 6 commits February 11, 2026 10:01
feat: migrate Source/Sink to V2 API (FLIP-27/FLIP-143)
8815ee6 
- Migrate Source from RichParallelSourceFunction to Source V2 API (FLIP-27)
  - Add LanceSource, LanceSourceReader, LanceSplitEnumerator
  - Add LanceSourceSplit, LanceEnumeratorState with serializers
  - Support checkpoint/recovery, parallel split assignment
  - Update LanceDynamicTableSource to use SourceProvider

- Migrate Sink from RichSinkFunction to Sink V2 API (FLIP-143)
  - Add LanceSink, LanceSinkWriter
  - Support APPEND and OVERWRITE write modes
  - Support checkpoint flush and auto batch flush
  - Update LanceDynamicTableSink to use SinkV2Provider
  - Fix Append mode missing read_version parameter bug

- Add comprehensive unit tests
  - LanceSourceV2Test: 23 tests covering Split, Serializer, State, Source
  - LanceSinkV2Test: 13 tests covering Writer, write modes, checkpoint

- All comments and messages in English
feat: add build tooling, CI/CD workflows, and Maven Wrapper
286531c 
- Add Maven Wrapper (mvnw) with Maven 3.9.9
- Add GitHub Actions workflows (CI, release, publish, auto-bump, PR title check)
- Add version management with bumpversion and CI scripts
- Add Makefile for common build commands
- Add checkstyle configuration
- Update pom.xml with release/deploy profiles and version management
- Update .gitignore for build artifacts
fix: resolve all checkstyle violations (428 errors)
28f2d03 
- Remove trailing whitespace from all Java source files
- Fix LineLength violations (>120 chars) by wrapping long lines:
  - Long throw/exception messages split across lines
  - Long Javadoc comments wrapped at sentence boundaries
  - Long method signatures with multiple parameters/throws
  - Long API call chains broken at method calls
- Remove 21 unused imports across multiple files
- Add braces to single-line if/else (NeedBraces)
- Remove redundant modifier in LanceInputFormat (RedundantModifier)
- Rename method 'm()' to 'maxEdges()' in LanceIndexBuilder (MethodName)
- Exclude test sources from checkstyle (includeTestSourceDirectory=false)
- Change checkstyle LineLength max from 100 to 120
style: apply spotless formatting to all Java source files
a35acd1 
- Apply google-java-format via spotless:apply
- Standardize license header format
- Fix indentation (4 spaces -> 2 spaces per google-java-format)
- Fix import ordering and grouping
- Fix Javadoc formatting
- 42 files reformatted
feat: implement IN predicate push-down for LanceDynamicTableSource
2cc0b0c 
- Add buildInFilter() method to convert Flink IN expressions to Lance SQL
- Generates 'field IN (val1, val2, ...)' filter syntax
- Fixes testInPredicatePushDown test failure
refactor: split LanceOptions into focused config classes and introduc…
9bf9dd1 
…e LanceSourceHandle

P1-A: Split LanceOptions God Object
- Extract LanceSourceOptions (read-side: path, batchSize, limit, columns, filter)
- Extract LanceSinkOptions (write-side: path, batchSize, writeMode, maxRowsPerFile)
- Extract LanceIndexOptions (index-building: indexType, metricType, PQ/HNSW params)
- Extract LanceVectorSearchOptions (vector-search: nprobes, ef, refineFactor)
- Add toSourceOptions/toSinkOptions/toIndexOptions/toVectorSearchOptions to LanceOptions
- All new classes are immutable with Builder pattern and validation

P1-B: Introduce LanceSourceHandle immutable object
- Carry push-down state (projection, filters, limit, aggregateInfo) as immutable snapshot
- Defensive copies for arrays and unmodifiable lists
- Add getHandle() and buildSourceOptions() to LanceDynamicTableSource

Tests: 43 new tests covering all config classes, conversion, and handle immutability
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fightBoxing commented Feb 11, 2026

Supplementary Explanation

the commitId is : 9bf9dd1

  • Split LanceOptions and introduce LanceSourceHandle.

  • The Split LanceOptions God Object splits the 849-line LanceOptions into four immutable configuration classes based on their responsibilities:

    • LanceSourceOptions — Read configuration

    • LanceSinkOptions — Write configuration

    • LanceIndexOptions — Index building configuration

    • LanceVectorSearchOptions — Vector search configuration

    Added transformation methods to LanceOptions to maintain full backward compatibility.

  • Introduce LanceSourceHandle The immutable Handle object encapsulates all push-down states (projection, filters, limit, aggregateInfo) and uses defensive copying to ensure thread safety.

refactor: P2 - Introduce LanceDatasetFactory and unify Dataset open l…
4a3ff7e 
…ogic

P2-A: Unified LanceDatasetFactory
- Extract LanceDatasetFactory utility in config package
- Provides open(path, allocator) with path validation and error wrapping
- Provides openManaged(path) with auto-managed allocator lifecycle
- Provides createAllocator(), validatePath(), closeQuietly() helpers
- ManagedDataset implements Closeable for try-with-resources pattern

P2-B: Replace all 12 Dataset.open calls across 10 files
- LanceSource, LanceAggregateSource, LanceInputFormat (legacy sources)
- LanceSink (legacy sink)
- LanceSinkWriter, LanceSourceReader, LanceSplitEnumerator (V2 runtime)
- LanceIndexBuilder, LanceVectorSearch (utility classes)
- LanceCatalog (3 occurrences)
- Net reduction: 31 lines of duplicated boilerplate removed

Tests: 12 new tests for LanceDatasetFactory covering:
- Path validation (null, empty, valid)
- Allocator creation and cleanup
- Error handling for non-existent datasets
- closeQuietly null-safety

All 269 tests pass. Spotless + Checkstyle clean.
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fightBoxing commented Feb 11, 2026

Supplementary Explanation

the commitId is: 4a3ff7e

  • Unified DatasetFactory — Eliminating duplicate Dataset opening logic
  • Refactor the code directory structur

refactor: P3 - Split LanceCatalog into StorageProvider architecture
0ca6900 
P3: Catalog Refactoring — Extract storage logic from LanceCatalog

New catalog subpackage: org.apache.flink.connector.lance.catalog

1. LanceCatalogPathResolver
   - Immutable path resolver for warehouse/database/table paths
   - Handles path normalization (trailing slash removal)
   - Detects remote storage (S3, GCS, Azure, HTTP/HTTPS)
   - resolveDatabasePath(), resolveTablePath()

2. LanceStorageProvider (interface)
   - Storage abstraction layer with 10 operations
   - initializeWarehouse, listDatabases, databaseExists, createDatabase
   - dropDatabase, listTables, tableExists, dropTable, renameTable
   - registerTable, configureEnvironment

3. LocalStorageProvider (implements LanceStorageProvider)
   - Local filesystem operations using java.nio.file
   - Lance dataset detection via _versions directory
   - Recursive directory deletion

4. RemoteStorageProvider (implements LanceStorageProvider)
   - In-memory ConcurrentHashMap registries for databases/tables
   - Lazy dataset existence probing via LanceDatasetFactory
   - Delegates to StorageEnvironmentManager for S3 credentials

5. StorageEnvironmentManager
   - Centralized S3/cloud credential management
   - Maps internal storage keys to AWS system properties
   - Maps internal keys to table-level connector options (toTableOptions)

LanceCatalog changes:
- Replaced all if(isRemoteStorage) branches with StorageProvider delegation
- Removed 7 private methods: configureStorageEnvironment, getDatabasePath,
  getDatasetPath, getStorageOptionsForTable, normalizeWarehousePath,
  isRemotePath, deleteDirectory
- Uses LanceDatasetFactory.createAllocator() / closeQuietly()
- Added getPathResolver() and getStorageProvider() for testability
- Net reduction: ~200 lines of mixed local/remote branching logic

Tests: 57 new tests across 4 test classes:
- LanceCatalogPathResolverTest: 18 tests (normalization, remote detection, resolution)
- StorageEnvironmentManagerTest: 7 tests (configure, toTableOptions)
- LocalStorageProviderTest: 16 tests (init, db ops, table ops, no-ops)
- RemoteStorageProviderTest: 16 tests (registry, env config, edge cases)

All 326 tests pass. Spotless + Checkstyle clean.
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fightBoxing commented Feb 11, 2026

Supplementary Explanation

the commitId :0ca69002188ca98a54c0d87f0e349a77fc5383a7

  • Catalog Split and Reconstruct
  • Code Refactoring Architecture Diagram
Clipboard_Screenshot_1770789980

feat: support CREATE TABLE with namespace integration
4473c31 
- LanceCatalog.createTable() now creates an empty Lance Dataset with
  the schema from CREATE TABLE DDL, persisting column info on disk
- LanceCatalog.getTable() merges user-provided table options (e.g.
  write.batch-size, write.mode) back into the returned CatalogTable
- LanceDynamicTableFactory: path is now optional (auto-injected by
  Catalog); declare S3 config options (s3-access-key, s3-secret-key,
  s3-region, s3-endpoint) as optional options
- LanceSinkWriter: support remote storage (S3/GCS/Azure) path existence
  checking via Dataset.open() probe instead of local Files.exists()
- Add 7 new integration tests covering CREATE TABLE lifecycle:
  dataset creation, user options preservation, duplicate detection,
  DROP TABLE, vector columns, custom databases, S3 options declaration

All 326 tests pass. Spotless + Checkstyle clean.
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