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Extending HCL OneDB™Beyond standard relational database objects, HCL OneDB™ can be extended to handle specialized data types, access methods, routines, and other objects. HCL OneDB™ includes many built-in extensions that are fully integrated in the database server. HCL OneDB™ 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 HCL OneDB™.
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 HCL OneDB™ databases.
User-Defined Routines and Data Types Developer's GuideThe HCL OneDB™ User-Defined Routines and Data Types Developer's Guide describes how to define new data types and enable user-defined routines (UDRs) to extend HCL OneDB™.
Create user-defined aggregates
Create user-defined aggregates
Resolve the support functions

Resolve the support functions

When an SQL statement uses a user-defined aggregate, the database server resolves the support functions to the proper UDRs.

The database server resolves the support functions without a database owner name. Therefore, the user-defined function resolution logic attempts the following schemas, respectively: the current user, the schema of the argument types, and the HCL OneDB™ schema, respectively. For more information about routine resolution, refer to Understanding routine resolution.

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