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Returns a Universal Unique Identifier (UUID).
SELECT uuid() FROM stream => 64c82e4c-7314-45e2-8ee2-c7283f6dbb74
Evaluates arbitrary expressions.
SELECT eval("2+3") FROM stream => 5
Causes the currently executing operator to sleep for the specified number of milliseconds.
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