New language functions in Stream Analytics

Four new built-in functions in Azure Stream Analytics address common scenarios: * REPLACE replaces all occurrences of a specified string value within another string value. * COALESCE evaluates a list of arguments and returns the value of the first expression that is not NULL. * ROUND returns a numeric value rounded to the specified length or precision. * CROSS-JOIN joins reference data with an event stream. * Azure Stream Analytics * Features * [ Azure Stream Analytics](https://azure.microsoft.com/en-gb/products/stream-analytics/)