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[GLUTEN-10215][VL] Delta 4 UT: add test infra synced from Delta 3.3#11938

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malinjawi wants to merge 2 commits intoapache:mainfrom
malinjawi:wip-delta40-write-ut-base
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[GLUTEN-10215][VL] Delta 4 UT: add test infra synced from Delta 3.3#11938
malinjawi wants to merge 2 commits intoapache:mainfrom
malinjawi:wip-delta40-write-ut-base

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What changes are proposed in this pull request?

This PR adds the Delta 4.0 test infrastructure by syncing shared Delta test utilities/mixins from the Delta 3.3 UT setup.

Changes in scope:

  • Add Delta 4 test utility and mixin files under backends-velox/src-delta40/test/....
  • Prepare the Delta 4 test foundation for follow-up DML/DDL suite PRs.
  • No Delta 4 native write runtime changes in this PR.

Part of #10215.

How was this patch tested?

  • Verified the PR diff is test-only and limited to backends-velox/src-delta40/test/....

Was this patch authored or co-authored using generative AI tooling?

Generated-by: IBM BOB

@github-actions github-actions bot added the VELOX label Apr 14, 2026
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