[spark] Add merge-into.skip-file-pruning option#8065
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Purpose
Add
merge-into.skip-file-pruningfor MergeInto partial column update on data-evolution tables. When enabled, this option skips the file-level pruning step. It is useful when most files in the target partition are expected to be updated, so the overhead of collecting touched file IDs outweighs the benefit of pruning untouched files.When file pruning is skipped, Spark merge into still pushes down target-table partition filters from the MERGE ON condition to avoid scanning unrelated partitions.
Tests
merge-into.skip-file-pruning, including result correctness and file-pruning join behavior.