[AURON #2221] Remove hard-coded Iceberg scan class name detection using type-based check

[guixiaowen]

…erg table types.

Which issue does this PR close?

Closes #2221

Rationale for this change

This PR removes string-based detection and replaces it with type-based checking.

The current implementation relies on hard-coded class name strings to detect Iceberg scan types:

`
if (!scanClassName.startsWith("org.apache.iceberg.spark.source.")) {
return None
}

if (scanClassName == "org.apache.iceberg.spark.source.SparkChangelogScan") {
return None
}

if (className != "org.apache.iceberg.spark.source.SparkInputPartition") {
return None
}
`

This approach introduces tight coupling to Iceberg internal class naming and has several drawbacks:

Fragile to upstream refactoring (class/package rename)
Lacks type safety
Hard to maintain and extend

Notes on Changelog Scan

ChangelogScan is not a subclass of SparkBatchQueryScan

What changes are included in this PR?

Three conditional scenarios were modified to avoid hard-coded logic in the evaluations.

Benefits
Removes hard-coded class name dependency
Improves type safety and readability
More robust against Iceberg internal refactoring
Cleaner and more maintainable logic

Are there any user-facing changes?

No changes.

How was this patch tested?

Depends on existing unit tests.

[Copilot]

Pull request overview

This PR updates Auron’s Iceberg integration to avoid brittle string-based detection of Iceberg scan/partition classes, moving toward type-based checks to better tolerate Iceberg refactoring.

Changes:

• Replaced hard-coded scan.getClass.getName prefix/equality checks with a class-based gate for identifying Iceberg batch scans.
• Replaced hard-coded SparkInputPartition class-name equality with a class-based check.
• Added a small utility under org.apache.iceberg.spark.source to expose Class[_] handles for (likely) package-private Iceberg classes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
thirdparty/auron-iceberg/src/main/scala/org/apache/spark/sql/auron/iceberg/IcebergScanSupport.scala	Swaps string-based Iceberg scan/partition detection to class-based checks.
thirdparty/auron-iceberg/src/main/scala/org/apache/iceberg/spark/source/AuronIcebergSourceUtil.scala	Introduces helper to access Class objects for Iceberg source types.

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