branch-4.1: Add datasketches HLL sketch aggregate functions #63143#63911
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### What problem does this PR solve? > An aggregate function is required to process user data containing Datasketches HLL sketches. In many data aggregation scenarios, users pre‑aggregate detailed data in Hive using the sketching techniques provided by Apache Datasketches, and then analyze the resulting sketches across various OLAP engines. Compared with the HLL union aggregate functions natively offered by these engines, there are two key diff to using Datasketches HLL sketches: firstly, the use cases differ; and secondly, HLL sketches can be used seamlessly across different engines—for example, simultaneously in ES, Doris, and ClickHouse. Such requirements are common in many production environments. Issue Number: - #63142(#63142) - #26416 - #56246 Summary: Implemented a built-in aggregate function that integrates the Datasketches HLL sketch. This aggregate function cannot rely on the Java UDF environment. Considering that in the Java UDF environment, Strings are encoded in UTF-8, which corrupts the binary data of sketches, the serialization/deserialization operations for sketches must be implemented on the BE side. (additionally, since Apache Datasketches has been added to the contrib directory via a git submodule, it will become very easy to add other sketches such as theta sketch in the future.) **see**: #63142 **use case**: see regression test & #63142 --------- Co-authored-by: yuanyuhao <yuanyuhao@bytedance.com>
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yiguolei
approved these changes
Jun 1, 2026
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Cherry-picked from #63143