[sdrp713]

Fixes #16610.

Description

Delta Lake 4.3 normalizes partition values when dynamic partition overwrite decides which files to remove, so equivalent but differently formatted values (timestamps, dates, decimals) match. The GPU Delta 4.3 write path already passes the new AddFiles to Delta's txn.filterFiles(Seq[AddFile]), which does the normalization, so no plugin code changes are needed. This PR adds integration tests showing the GPU matches the CPU.

New tests in delta_lake_write_test.py rewrite the stored partition strings in the table logs, then run a DPO write on CPU and GPU:

• timestamp, date and decimal partitions with null partitions, under UTC and America/Los_Angeles, with mixed timestamp spellings in one table
• a renamed physical partition column (column mapping)
• parsePartitionValues=false, where raw string comparison must match between CPU and GPU
• an unparseable partition value, where both fall back to raw string comparison and succeed
• SQL INSERT OVERWRITE on a table with two partition columns, including null bearing partitions

Performance tests are not required because this change only adds regression tests and does not modify runtime code or the existing GPU write path.

Checklists

Documentation

• Updated for new or modified user-facing features or behaviors
• No user-facing change

Testing

• Added or modified tests to cover new code paths
• Covered by existing tests
  (Please provide the names of the existing tests in the PR description.)
• Not required

Performance

• Tests ran and results are added in the PR description
• Issue filed with a link in the PR description
• Not required

[greptile-apps]

Confidence Score: 5/5

[Low impact] The PR appears safe to merge; the Python 3.8 collection issue is fixed.

Summary

Adds Delta Lake 4.3 tests that compare CPU and GPU dynamic partition overwrite behavior.

• Delta overwrite tests check matches across alternate partition spellings.
• Delta overwrite tests cover raw and unparseable partition strings.
• SQL overwrite tests cover matching across two partition columns.

_{Reviews (3) · Last reviewed commit: "Fix test import" · Reviewed by Greptile}