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[Spark] Extend Delta feature drop safety check to unbackfilled deltas (…
…delta-io#3028) #### Which Delta project/connector is this regarding? - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description When dropping a feature, DeltaLog now checks both backfilled and unbackfilled deltas for any traces of the feature before confirming it's safe to drop. However, feature dropping currently does a checkpoint before detecting feature traces in the history, so there are no unbackfilled deltas at that point. ## How was this patch tested? UTs ## Does this PR introduce _any_ user-facing changes? No
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