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# Conflicts: # website/docs/table-design/merge-engines/aggregation.md
# Conflicts: # website/docs/table-design/merge-engines/aggregation.md
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Summary
Add
kll_double_sketchaggregation for BYTES columns. Rows with the same primary key merge serialized Apache DataSketches KLL doubles sketches, preserving a distribution that clients can query for approximate percentiles.Registers the aggregation metadata and server factory, tests sketch merging, null inputs, invalid payloads and Flink option parsing, and documents serialized-sketch insert semantics and Spark HLL examples. Raw DOUBLE inputs still require sketch construction by the writer; SQL helper functions are separate work.
Part of #3331. Depends on #3337 for the DataSketches dependency and HLL foundation. This draft includes those commits until #3337 merges. The KLL implementation is commit e712d83; compare against the hll-sketch-aggregation branch for the KLL-only diff.
Test Plan
git diff origin/main...HEAD --checkpasses.TableDescriptorTest,FieldAggregatorParameterizedTest, andFlinkAggFunctionParserTest, including Checkstyle, Spotless, and license checks:mvn -B -pl fluss-common,fluss-server,fluss-flink/fluss-flink-common -am -Dtest=TableDescriptorTest,FieldAggregatorParameterizedTest,FlinkAggFunctionParserTest -Dsurefire.failIfNoSpecifiedTests=false test(JDK 17).AI-assisted changes; pending human review.