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UUID()

Returns a Universal Unique Identifier (UUID).

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

Eval(String)

Evaluates arbitrary expressions.

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

Sleep(Number)

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

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