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[VL] Fix Iceberg row level scan/write regressions on Spark 4.0#11989

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ReemaAlzaid wants to merge 8 commits intoapache:mainfrom
ReemaAlzaid:fix/iceberg-update-support
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[VL] Fix Iceberg row level scan/write regressions on Spark 4.0#11989
ReemaAlzaid wants to merge 8 commits intoapache:mainfrom
ReemaAlzaid:fix/iceberg-update-support

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@ReemaAlzaid
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What changes are proposed in this pull request?

This PR fixes several related Iceberg row-level issues in the Velox backend:

  • support _file and _pos metadata columns
  • drop subquery runtime filters from row level metadata scans
  • fallback Iceberg metadata table scans to Spark
  • honor ANSI fallback in the Iceberg update/write path
  • align native Iceberg write columns by name after schema evolution

@github-actions github-actions Bot added CORE works for Gluten Core VELOX DATA_LAKE labels Apr 26, 2026
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Run Gluten Clickhouse CI on x86

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CORE works for Gluten Core DATA_LAKE VELOX

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