Add skewPopStable, skewSampStable, kurtPopStable, kurtSampStable aggregate functions - #3

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coderashed wants to merge 10 commits into

coderashed/skew-kurt-stable

Commits on Jun 27, 2026

Fix wrong mean formula in AggregateFunctionHigherMomentsData::mergeWith
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b457eb0
Add reference file for 04412_skew_kurt_stable
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40e1078
Extend 04412_skew_kurt_stable with samp merge, constant input, asymmetric split, and two-element edge cases
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f1477a6
Add scale invariance, exact values, and three-way merge tests for skew/kurt stable
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1e8bd5b
Add UNREACHABLE after switch in getResult and add cross-distribution merge test for skew/kurt stable
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3a7097d
Add documentation stubs for skewPopStable, skewSampStable, kurtPopStable, kurtSampStable
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5acb3d6
Improve documentation descriptions for stable skew/kurt functions
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fb782d2
Add FunctionDocumentation for skewPopStable, skewSampStable, kurtPopStable, kurtSampStable
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39130a9
Consolidate citation to Pébay, Terriberry, Kolla, Bennett (2016) for both update and merge formulas
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c7ab8e3
Add skewPopStable, skewSampStable, kurtPopStable, kurtSampStable to QueryFuzzer aggregate function list
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540a7e5