feat: Phase 3a — merge metadata aggregation, message types, replaced_split_ids#6352
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…it_ids (Phase 3a) Phase 3 pipeline integration, first PR: - merge_parquet_split_metadata(): aggregates input split metadata with MergeOutputFile physical metadata to produce complete ParquetSplitMetadata for merged output. Validates invariant fields, unions metric_names and tags, finalizes tag cardinality after merge. 17 tests. - ParquetNewSplits, ParquetMergeTask, ParquetMergeScratch message types for the merge actor chain (planner → scheduler → downloader → executor). - Add replaced_split_ids to ParquetSplitBatch and propagate through ParquetUploader (was hardcoded Vec::new()). Enables merge executor to specify which splits are being replaced. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Phase 3 (pipeline integration), first PR. Building on Phase 1 (merge engine, #6335) and Phase 2 (merge policy, #6351).
merge_parquet_split_metadata()— aggregates input split metadata withMergeOutputFilephysical metadata to produce completeParquetSplitMetadatafor merged output. Validates invariant fields (kind, index_uid, partition_id, sort_fields, window), unions metric_names and tags, finalizes tag cardinality after merge. 17 unit tests.ParquetNewSplits,ParquetMergeTask,ParquetMergeScratchfor the merge actor chain (planner → scheduler → downloader → executor).replaced_split_ids— added toParquetSplitBatchand propagated throughParquetUploader(was hardcodedVec::new()). Enables the merge executor to specify which splits are being replaced during atomic publish-and-replace.Test plan
merge_parquet_split_metadata()ParquetUploadertests pass with new fieldcargo clippyclean,cargo doccompiles, license headers OK🤖 Generated with Claude Code