/// <summary>
/// Registers handler to generate T-SQL for custom function.
/// </summary>
/// <param name="functionKey">The function key.</param>
/// <param name="handler">The handler.</param>
public static void RegisterFunctionHandler(FunctionKey functionKey, Action <ExpressionGenerator, DbFunctionExpression> handler)
{
functionKey.VerifyNotNull(nameof(functionKey));
handler.VerifyNotNull(nameof(handler));
s_functionHandlers.Add(functionKey, handler);
}
