pranav.lodha 20a9d2669c IMPALA-11957: Implement Regression functions: regr_slope(), ...

regr_intercept() and regr_r2()

The linear regression functions fit an ordinary-least-squares regression
line to a set of number pairs. They can be used both as aggregate and
analytic functions.

regr_slope() takes two arguments of numeric type and returns the slope
of the line.
regr_intercept() takes two arguments of numeric type and returns the
y-intercept of the regression line.
regr_r2() takes two arguments of numeric type and returns the
coefficient of determination (also called R-squared or goodness of fit)
for the regression.

Testing:
The functions are extensively tested and cross-checked with Hive. The
tests can be found in aggregation.test.
Change-Id: Iab6bd84ae3e0c02ec924c30183308123b951caa3
Reviewed-on: http://gerrit.cloudera.org:8080/19569
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>

2023-08-24 13:06:47 +00:00

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