The Reference guide says that you can create your own user-defined aggregates, 
but Derby does not have this capability.
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                 Key: DERBY-3550
                 URL: https://issues.apache.org/jira/browse/DERBY-3550
             Project: Derby
          Issue Type: Bug
          Components: Documentation
            Reporter: Rick Hillegas
             Fix For: 10.4.1.0


The "Aggregates (set functions)" section of the Reference Guide says "You can 
also create your own aggregates to perform other set functions such as 
calculating the standard deviation." This is not true. See DERBY-672. This 
sentence confuses users. See the following email thread: 
http://www.nabble.com/STDDEV-for-Derby-td16038184.html#a16038184

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