Developing Apama Applications > Developing Apama Applications in EPL > Working with Streams and Stream Queries > Defining stream queries > IEEE special values in stream query expressions
IEEE special values in stream query expressions
The following information about IEEE special values applies to the following expressions:
*The key expression in a with unique clause
*A partition by expression
*The expressions that define the conditions in a join clause
*A group by expression
If one of these expressions is a decimal or float value, or a container that involves a decimal or float value, and the decimal or float value is an IEEE special value then the following applies:
*NaN — This value is illegal as all or part of an expression and terminates the monitor instance.
*Positive/negative infinity — These values are legal and all positive infinities are treated as equal as are all negative infinities.
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