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Add median, std, and corr functions #1486

Description

@matthewmturner

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

In the context of adding datafusion to db-benchmark (#147) there are some advanced group by queries that are benchmarked which require median, standard deviation, and correlation functions which datafusion does not currently provide out of the box.

Describe the solution you'd like

Builtin support for median, standard deviation, and correlation functions.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

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Add any other context or screenshots about the feature request here.

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