Add statistical type aggregate functions, including autocorrelation, skewness, and linear regression#17292

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Cool6689 wants to merge 7 commits intoapache:masterfrom

Cool6689:feat/Statistical-Aggregate-Functions

Commits on Feb 1, 2026

Add correlation and covariance aggregate functions to the query engine
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Commits on Feb 2, 2026

Enhance aggregate functions to support TIMESTAMP data type
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Commits on Mar 10, 2026

Add regression aggregate functions: REGR_SLOPE and REGR_INTERCEPT
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Commits on Mar 11, 2026

Add skewness and kurtosis aggregate functions with input validation
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Commits on Mar 12, 2026

Commits on Mar 13, 2026

Refactor correlation and regression accumulators to improve code clarity by removing unnecessary comments and whitespace
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