[AURON #2234] Handle Hudi scan options case-insensitively

[weimingdiit]

Which issue does this PR close?

Closes #2234

Rationale for this change

Auron Hudi native scan detection checks several Hudi datasource options and table properties by key, including table type, base file format, table path, and time travel options.

These lookups were previously case-sensitive. Spark datasource options are commonly handled case-insensitively, so mixed-case Hudi option keys may cause Auron to miss important scan metadata.

This can lead to incorrect native scan conversion decisions. For example, a mixed-case MOR table type option may not be detected, so a query that should fall back to Spark could be considered eligible for native scan.

What changes are included in this PR?

This PR makes Hudi scan option and property lookup case-insensitive for:

• Hudi table type
• Hudi base file format
• Hudi table path
• Hudi time travel options
• Hudi catalog/storage properties
• Hudi table properties loaded from .hoodie/hoodie.properties

It also adds unit coverage for mixed-case Hudi options.

Are there any user-facing changes?

No API changes.
This only makes Hudi native scan detection more compatible and safer when Hudi option key casing differs.

How was this patch tested?

CI.

[Copilot]

Pull request overview

This PR improves the robustness of Auron’s Hudi native scan detection by making option/property lookups case-insensitive, aligning behavior with common Spark datasource option handling and reducing the risk of unsafe native scan eligibility decisions when users supply mixed-case Hudi keys.

Changes:

• Normalize Hudi scan option and catalog/storage property lookups to be case-insensitive (table type, base file format, path, time travel keys).
• Make .hoodie/hoodie.properties lookups case-insensitive for relevant keys.
• Add a unit test covering mixed-case Hudi option keys.

Reviewed changes

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

File	Description
thirdparty/auron-hudi/src/main/scala/org/apache/spark/sql/auron/hudi/HudiScanSupport.scala	Introduces shared case-insensitive lookup helpers and applies them across Hudi support detection paths (options, catalog, metadata properties, time travel).
thirdparty/auron-hudi/src/test/scala/org/apache/spark/sql/auron/hudi/HudiScanSupportSuite.scala	Adds a unit test validating mixed-case option keys are handled as expected.

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