src/Manipulation/Select.php
public function setFunctionAsColumn($funcName, array $arguments, $alias)
    {
        return $this->columnQuery->setFunctionAsColumn($funcName, $arguments, $alias);
    }
public function setFunctionAsColumn($funcName, array $arguments, $alias)
    {
        return $this->columnQuery->setFunctionAsColumn($funcName, $arguments, $alias);
    }
Allows calculation on columns using predefined SQL functions.

@param string   $funcName
@param string[] $arguments
@param string   $alias

@return ColumnQuery