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Creating User-Defined Aggregates
In This Chapter
Extending Existing Aggregates
Overloading Operators for Built-In Aggregates
Extending an Aggregate
Example of Extending a Built-In Aggregate
Creating User-Defined Aggregates
Support Functions
INIT Function
ITER Function
FINAL Function
COMBINE Function
Resolving the Support Functions
Support-Function States
Using C or Java Support Functions
Example of a User-Defined Aggregate
Using User-Defined Data Types with User-Defined Aggregates
Omitting Support Functions
Managing Aggregates
Parallel Execution of Aggregates
Privileges for User-Defined Aggregates
Aggregate Information in the System Catalog
Aggregate Information from the Command Line
Dropping an Aggregate
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