feat: Add native sort merge join operator [experimental]#3871

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andygrove wants to merge 12 commits intoapache:mainfrom

andygrove:comet-native-smj

Commits on Apr 1, 2026

feat: scaffold CometSortMergeJoinExec module structure
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feat: add SortMergeJoinMetrics matching CometMetricNode.scala
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feat: add OutputBuilder for join batch materialization
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feat: add join filter evaluation with corrected masks for outer/semi/anti
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feat: implement SortMergeJoinStream state machine and wire up execute()
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fix: resolve clippy warnings in sort_merge_join_stream
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feat: add useNative config toggle and planner integration for Comet SMJ
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test: add inner join unit tests for CometSortMergeJoinExec
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test: add outer, semi, anti, and spill tests for sort merge join
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chore: fix clippy warnings and format sort merge join code
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refactor: simplify output builder and encapsulate matched tracking
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perf: cache row-format keys per batch instead of per-row conversion
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