Native tuple sketch functions (tuple_*, Spark 4.2): audit the crate against Java and implement
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评估
- 难度
- 5/5
- 预计耗时
- 一周以上
- 新手友好度
- 12/100
- Issue 类型
- 功能
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
调研方向
This is a multi-part audit and implementation across the Rust tuple feature of the datasketches crate and Comet's Spark expression support, so it is not a starting point. Begin with the Spark 4.2 tuple function definitions and the existing theta sketch expressions in the Comet source, then compare the crate's summary types and union/intersection policies against DataSketches-Java 6.2.0 fixtures. Done means each tuple_* function runs natively with a Spark fallback before 4.2, backed by committed fixtures and tests.
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描述
What is the problem the feature request solves?
Part of #7397.
Spark 4.2 adds Tuple sketch functions: tuple_sketch_agg, tuple_union_agg, tuple_intersection_agg, the tuple_difference / tuple_union / tuple_intersection scalars, and tuple_sketch_estimate, tuple_sketch_summary and tuple_sketch_theta, each in integer and double summary variants. None of them run natively in Comet. The crate's tuple feature arrived in datasketches 0.4.0.
Describe the potential solution
- Score the family with
suggest-native-expressionfirst. This is the lowest priority of the four, because it only exists in the newest Spark version Comet supports. - Do the theta work first, since a tuple sketch is a theta sketch with a summary attached and shares its hashing and set-operation behavior.
- Audit the crate's
tuplefeature against DataSketches-Java 6.2.0 using committed fixtures. The summary types and the policies that combine summaries on union and intersection need to match Spark's exactly, and the serialized summary format has to be readable in both directions. - Implement, test and document as for the other families, with a fallback on Spark versions before 4.2.
- 主要语言
- Scala
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