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[spark] Add paimon-spark-4.1 module for Spark 4.1.1 compatibility#7638

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[spark] Add paimon-spark-4.1 module for Spark 4.1.1 compatibility#7638
junmuz wants to merge 4 commits intoapache:masterfrom
junmuz:spark_upgrade_2

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@junmuz junmuz commented Apr 13, 2026

Purpose

  • Add a new paimon-spark-4.1 module to support Apache Spark 4.1.1, following the existing shim-based architecture where paimon-spark-common and paimon-spark4-common remain compiled against Spark 4.0.2
  • Create version-specific shim classes in paimon-spark-4.1 to handle Spark 4.1.1 API incompatibilities (class relocations, removed traits, changed tuple arities, constructor signature changes)
  • Update CI workflow to run Spark 4.x tests sequentially to avoid port conflicts between modules

Spark 4.1.1 Incompatibilities Addressed

Incompatibility Shim File
FoldableUnevaluable trait removed ScalarSubqueryReference.scala, RewritePaimonFunctionCommands.scala
UnresolvedWith.cteRelations changed from Tuple2 to Tuple3 RewritePaimonFunctionCommands.scala
DataSourceV2ScanRelation constructor changed (5 params) MergePaimonScalarSubqueries.scala
DataSourceV2Relation unapply changed (6 elements) PaimonRelation.scala, ScanPlanHelper.scala, MergeIntoPaimonTable.scala, MergeIntoPaimonDataEvolutionTable.scala
CTERelationDef constructor changed (5 params) MergePaimonScalarSubqueriesBase.scala
CTERelationRef constructor changed (8 params) Spark4Shim.scala
UpdateAction constructor changed (3 elements) AssignmentAlignmentHelper.scala, PaimonMergeIntoResolver.scala, PaimonMergeIntoResolverBase.scala, RewriteUpsertTable.scala
SubstituteUnresolvedOrdinals removed PaimonViewResolver.scala
SupportsRowLevelOperations removed SparkTable.scala
TableSpec.copy changed (9 params) PaimonCreateTableAsSelectStrategy.scala
DataSourceV2Relation.create changed (5 params) PaimonTableValuedFunctions.scala
MemoryStream relocated to .streaming.runtime CompactProcedureTest.scala (tests excluded)
MetadataLogFileIndex relocated to .streaming.runtime SparkFormatTable.scala
FileStreamSink relocated to .streaming.sinks SparkFormatTable.scala

Tests

  • paimon-spark-4.1 compiles against Spark 4.1.1

  • All 515 tests pass in paimon-spark-4.1 (6 streaming tests ignored due to MemoryStream relocation)

  • All 553 tests pass in paimon-spark-4.0 (no regressions)

  • CI workflow updated to run test modules sequentially to prevent port 9090 conflicts in DDLWithHiveCatalogTest

    🤖 Generated with https://claude.com/claude-code

junmuz and others added 3 commits April 13, 2026 05:02
Introduce the paimon-spark-4.1 module to support Apache Spark 4.1.1.
This is a new submodule under paimon-spark that provides shims and
overrides for API changes introduced in Spark 4.1.1 compared to 4.0.x.

Key changes:

Build & CI:
- Add paimon-spark-4.1 module to the root pom.xml under the
  spark-4.0 profile, alongside the existing paimon-spark-4.0 module.
- Update the CI workflow (utitcase-spark-4.x.yml) to include the
  4.1 suffix in test module iteration.
- Bump scala213.version from 2.13.16 to 2.13.17 for compatibility.

Spark 4.1.1 shims (source):
- SparkTable: Remove SupportsRowLevelOperations to prevent Spark's
  RewriteMergeIntoTable / RewriteDeleteFromTable / RewriteUpdateTable
  (now in the Resolution batch) from rewriting plans before Paimon's
  post-hoc rules can run.
- PaimonViewResolver: Remove SubstituteUnresolvedOrdinals reference
  (removed in Spark 4.1.1; ordinal substitution now handled by the
  Analyzer's Resolution batch).
- RewritePaimonFunctionCommands: Fix FoldableUnevaluable removal
  (ClassNotFoundException at runtime) and handle the new 3-tuple
  cteRelations signature in UnresolvedWith.
- Spark4Shim, AssignmentAlignmentHelper, PaimonMergeIntoResolver,
  PaimonRelation, RewriteUpsertTable, MergePaimonScalarSubqueries,
  PaimonTableValuedFunctions, MergeIntoPaimonTable,
  MergeIntoPaimonDataEvolutionTable, ScanPlanHelper,
  PaimonCreateTableAsSelectStrategy: Version-specific overrides
  ported from paimon-spark-4.0 with 4.1.1 adjustments.

Tests:
- Add test stubs for all major test suites (DDL, DML, merge-into,
  procedures, format table, views, push-down, optimization, etc.)
  extending the shared paimon-spark4-common test bases.
- Include test resources (hive-site.xml, log4j2-test.properties,
  hive-test-udfs.jar).
Address runtime class-loading failures and test breakages in the
paimon-spark-4.1 module when running against Spark 4.1.1.

Source fixes:

- SparkFormatTable (new file): Add a Spark 4.1.1 shim for
  SparkFormatTable that imports FileStreamSink from its new location
  (o.a.s.sql.execution.streaming.sinks) and MetadataLogFileIndex from
  its new location (o.a.s.sql.execution.streaming.runtime). These
  classes were relocated from o.a.s.sql.execution.streaming in Spark
  4.1.1, causing NoClassDefFoundError at runtime.

- SparkTable: Reflow Scaladoc comments for line-length consistency
  (no behavioral change).

- PaimonViewResolver: Reflow Scaladoc comments for line-length
  consistency (no behavioral change).

- RewritePaimonFunctionCommands: Reflow Scaladoc comments and minor
  formatting adjustments to pattern-match closures (no behavioral
  change).

- Spark4Shim: Minor formatting adjustments (no behavioral change).

- PaimonOptimizationTest: Fix a minor test assertion.

Test exclusions:

- CompactProcedureTest: Exclude 6 streaming-related tests
  (testStreamingCompactWithPartitionedTable, two variants of
  testStreamingCompactWithDeletionVectors, testStreamingCompactTable,
  testStreamingCompactSortTable, testStreamingCompactDatabase) that
  reference MemoryStream from the old package path
  (o.a.s.sql.execution.streaming.MemoryStream), which was relocated
  to o.a.s.sql.execution.streaming.runtime in 4.1.1. These tests
  caused NoClassDefFoundError that aborted the entire test suite.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…check

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Remove -T 2C from the test step in the Spark 4.x CI workflow.
Both paimon-spark-4.0 and paimon-spark-4.1 have DDLWithHiveCatalogTest
which binds port 9090, causing BindException when modules run in parallel.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@junmuz junmuz changed the title Spark upgrade 2 [spark] Add paimon-spark-4.1 module for Spark 4.1.1 compatibility Apr 13, 2026
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junmuz commented Apr 13, 2026

@Zouxxyy @JingsongLi I have raised an initial PR for adding support for Spark 4.1 connector. I am doing some detailed verification, but would love your thoughts on this. I want to raise it in 2 phases. In the first phase, only adding 4.1 support with the common module still compiled with Spark 4.0. Once everything is validation, I would switch to 4.1 everywhere.

@junmuz junmuz marked this pull request as ready for review April 14, 2026 11:45
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