[VL][Delta] Add Delta Spark UT pipeline gated against a known-failures baseline#12388

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Commits on Jul 3, 2026

[GLUTEN][CI] Add Delta Spark UT pipeline gated against a known-failures baseline

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Change order of steps

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[CI] Cherry-pick Delta FileSourceScanLike test fixes and refresh baseline

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[CI] Reuse velox_backend_x86's native build for Delta Spark UT

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[CI] Harden Delta UT setup clone and enforce-mode baseline check

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[CI] Harden Delta UT gate and setup against silent failures

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Commits on Jul 4, 2026

[CI] Quarantine flaky Delta DV-merge tests in the UT gate

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