apache/incubator-optiq — pull request #16 by yssharma (2014-09-28 13:29:21+00:00)
Title: Covariance function - allow two arguments

Fixed Covariance function to accept two arguments. Fixed testcase to handle checks.
Create a new SqlCovarAggrFunction for the same to accept 2 numeric arguments.

Testcases:
SqlOperatorTestBase#testCovarPopFunc
SqlOperatorBaseTest#testCovarSampFunc