UUID()

Returns a Universal Unique Identifier (UUID).

SELECT uuid() FROM stream
=> 64c82e4c-7314-45e2-8ee2-c7283f6dbb74

Eval(String)

Evaluates arbitrary expressions.

SELECT eval("2+3") FROM stream
=> 5

Sleep(Number)

Causes the currently executing operator to sleep for the specified number of milliseconds.

eIf(Expression, Object, Object)

Returns the first Object if the expression evaluates to true else the second Object

SELECT eif(1>0, "Greater than 0", "Lower or equal") FROM stream
=> Greater than 0