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https://issues.apache.org/jira/browse/IMPALA-7426?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jim Apple resolved IMPALA-7426.
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Resolution: Fixed
Fix Version/s: Impala 3.1.0
https://github.com/apache/impala/commit/cb26d8d82880e934aae9ef211ca7752de510e84a
> T-test is an unreliable method for comparing non-normal distributions
> ---------------------------------------------------------------------
>
> Key: IMPALA-7426
> URL: https://issues.apache.org/jira/browse/IMPALA-7426
> Project: IMPALA
> Issue Type: Bug
> Components: Infrastructure
> Reporter: Jim Apple
> Assignee: Jim Apple
> Priority: Major
> Fix For: Impala 3.1.0
>
>
> https://en.wikipedia.org/wiki/Student%27s_t-test is for normally distributed
> variables, and many Impala benchmarks won't be formally distributed. In
> particular, none of them will have negative run times.
> We should consider https://en.wikipedia.org/wiki/Nonparametric_statistics
> like
> https://en.wikipedia.org/wiki/Mann%E2%80%93Whitney_U_test#Comparison_to_Student's_t-test
> in report_benchmark_results.py.
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