feat(extensions): add stddev aggregate function to percentile module #4212
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* Implement stddev aggregate using Welford’s algorithm (stddev(expr)); * Add extension tests for stddev in grouped and ungrouped queries.
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This implementation computes the sample standard deviation, which is the same convention used by most SQL engines (e.g. PostgreSQL).
Description
stddevaggregation;stddev(expr)aggregate using Welford’s algorithm;stddevin both grouped and ungrouped queries.Motivation and context
Standard deviation is a common statistical measure that can be helpful in many use cases.
This resolves #1060.