[AURON #2026] Migrate from deprecated JavaConverters to CollectionConverters.

[slfan1989]

Which issue does this PR close?

Closes #2026

Rationale for this change

The codebase currently uses the deprecated scala.collection.JavaConverters API for Java-Scala collection conversions. This API was deprecated in Scala 2.13 in favor of scala.jdk.CollectionConverters.

Current issues:

• Deprecation warnings are being suppressed in build configuration (pom.xml:1055)
• Using outdated API that doesn't follow Scala best practices
• Potential migration barrier when upgrading to Scala 2.13+

The project already includes scala-collection-compat dependency (version 2.12.0), which provides a compatibility layer allowing the use of modern scala.jdk.CollectionConverters API in Scala 2.12 without any behavioral changes.

What changes are included in this PR?

How this works with Scala 2.12:
The scala-collection-compat library provides a compatibility layer that:

• In Scala 2.12: redirects scala.jdk.CollectionConverters to scala.collection.JavaConverters
• In Scala 2.13+: uses native scala.jdk.CollectionConverters

This ensures zero runtime behavioral changes.

Are there any user-facing changes?

No. This is purely an internal code refactoring with no user-facing changes or behavioral differences.

How was this patch tested?

Existing unit tests pass.

[Copilot]

Pull request overview

This pull request migrates the codebase from the deprecated scala.collection.JavaConverters API to the modern scala.jdk.CollectionConverters API. The migration is enabled by adding the scala-collection-compat library (version 2.12.0) as a dependency, which provides a compatibility layer that ensures zero runtime behavioral changes in Scala 2.12 while preparing the codebase for future Scala 2.13+ migration.

Changes:

• Added scala-collection-compat dependency (version 2.12.0) to pom.xml with proper dependency management configuration
• Replaced all scala.collection.JavaConverters._ imports with scala.jdk.CollectionConverters._ across 30 Scala files
• Updated specific converter imports (e.g., asScalaBufferConverter, seqAsJavaListConverter) to use wildcard imports

Reviewed changes

Copilot reviewed 31 out of 31 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pom.xml	Added scala-collection-compat dependency property, dependencyManagement entry, and dependency declaration
thirdparty/auron-uniffle/src/main/scala/org/apache/spark/sql/execution/auron/shuffle/uniffle/AuronUniffleShuffleReader.scala	Updated JavaConverters import to CollectionConverters
thirdparty/auron-paimon/src/main/scala/org/apache/spark/sql/hive/execution/auron/plan/NativePaimonTableScanExec.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/hive/execution/auron/plan/NativeHiveTableScanBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeWindowBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeUnionBase.scala	Replaced specific converter import with wildcard CollectionConverters import
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeTakeOrderedBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeSortMergeJoinBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeSortBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeShuffledHashJoinBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeShuffleExchangeBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeRenameColumnsBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeProjectBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeParquetSinkBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeParquetScanBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeOrcScanBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeGenerateBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeFilterBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeFileSourceScanBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeExpandBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeBroadcastJoinBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeBroadcastExchangeBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/plan/NativeAggBase.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/columnar/ColumnarHelper.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/arrowio/util/ArrowWriter.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/execution/auron/arrowio/util/ArrowUtils.scala	Replaced specific converter imports with wildcard CollectionConverters import
spark-extension/src/main/scala/org/apache/spark/sql/auron/NativeConverters.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/spark/sql/auron/AuronConverters.scala	Updated JavaConverters import to CollectionConverters
spark-extension/src/main/scala/org/apache/auron/metric/SparkMetricNode.scala	Updated JavaConverters import to CollectionConverters
auron-spark-tests/common/src/test/scala/org/apache/spark/sql/SparkQueryTestsBase.scala	Updated JavaConverters import to CollectionConverters
auron-spark-tests/common/src/test/scala/org/apache/auron/utils/SparkTestSettings.scala	Updated JavaConverters import to CollectionConverters

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[slfan1989]

@ShreyeshArangath Thank you for review the code! @cxzl25 Could you take another look at this PR? Thanks a lot!