Fix test cases: Iceberg datetime transforms

[res-life]

fixes #13852

Some cases were not updated in PR #13726.

Signed-off-by: Chong Gao res_life@163.com

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Greptile Overview

Greptile Summary

Updates Iceberg merge test cases to align with newly supported partition transforms introduced in PR #13726.

• Adds year/month/day/hour partition transforms on date and timestamp columns to test_iceberg_merge (lines 160-166) to verify GPU execution now works correctly
• Removes year/month/day/hour transforms from test_iceberg_merge_fallback_unsupported_partition_transform (lines 287-289) since these are now GPU-supported
• Keeps only truly unsupported transforms in fallback test: identity partitioning, truncate(5, string_col), and bucket(8, string_col)
• Fixes issue [BUG] Iceberg merge tests failing after Delta clustered table update support #13852 where 24 merge tests were failing because the tests expected GPU fallback but transforms were actually GPU-supported

Confidence Score: 5/5

• This PR is safe to merge - it's a straightforward test update that mirrors changes already made to other test files
• The changes are minimal, low-risk test parameterization updates that simply align the merge tests with the feature support added in PR Supports year/month/day/hour partition transforms for Iceberg #13726. The same pattern was already successfully applied to other Iceberg test files (append, delete, update, CTAS, RTAS, etc.). Column references are correct and the logic is sound.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
integration_tests/src/main/python/iceberg/iceberg_merge_test.py	5/5	Updates test parameterization to reflect newly supported year/month/day/hour partition transforms by adding them to positive tests and removing them from fallback tests

Sequence Diagram

sequenceDiagram
    participant PR13726 as PR #13726
    participant IcebergSupport as Iceberg GPU Support
    participant MergeTest as test_iceberg_merge
    participant FallbackTest as test_iceberg_merge_fallback_unsupported_partition_transform
    
    Note over PR13726,IcebergSupport: PR #13726 adds GPU support
    PR13726->>IcebergSupport: Implement year/month/day/hour transforms
    IcebergSupport-->>PR13726: Transforms now GPU-accelerated
    
    Note over MergeTest,FallbackTest: Tests need updating (missed in #13726)
    
    Note over PR13726,FallbackTest: Current PR #13856 fixes tests
    PR13726->>MergeTest: Add year/month/day/hour to test cases
    Note right of MergeTest: Now tests GPU execution<br/>with supported transforms
    
    PR13726->>FallbackTest: Remove year/month/day/hour from fallback tests
    Note right of FallbackTest: Only tests unsupported<br/>transforms (identity, truncate, bucket on string)

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[pxLi]

Please help double confirm if this is required by 25.12 or 26.02? If 25.12 please rebase on release/25.12, thanks~

[res-life]

target 25.12

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[liurenjie1024]

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