HeartSaVioR opened a new pull request #23850: [SPARK-26949][SS] Prevent 'purge' to remove needed batch files in CompactibleFileStreamLog URL: https://github.com/apache/spark/pull/23850 ## What changes were proposed in this pull request? This patch proposes making `purge` in `CompactibleFileStreamLog` to throw `UnsupportedOperationException` to prevent purging necessary batch files. Actually it would only break when latest compaction batch is requested to be purged, but caller wouldn't be aware of this so safer to just prevent it. ## How was this patch tested? Added UT.
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