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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix®.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
DataBlade® API Programmer's GuideThe Informix® DataBlade® API Programmer's Guide describes information about the DataBlade® API, the C-language application programming interface (API) provided with HCL Informix®.
Create user-defined routines
Create special-purpose UDRsThis section describes how to create special UDRs, such as iterator functions, user-defined aggregates, and optimization functions.
Write an aggregate functionAn aggregate is a function that returns one value for a group of queried rows. The aggregate function performs one iteration for each of the queried rows.
Creating a user-defined aggregate

Creating a user-defined aggregate

The built-in aggregates provide basic aggregations. However, if your data requires some special aggregation, you can create a custom aggregate function, called a user-defined aggregate. To implement your custom aggregation, you design an aggregate algorithm, which consists of the following parts:

The aggregate state, which contains the information that needs to be passed between iterations of the aggregate
The aggregation tasks, which are implemented as special-purpose user-defined functions called aggregate support functions

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