Some opaque data types require special processing when they are deleted. For example, if an opaque data type contains spatial or multirepresentational data, it might provide a choice of how to store the data: inside the internal structure or, for large objects, in a smart large object.
To accomplish this process, call a user-defined support function called destroy( ). When you use DELETE to remove a row that contains one of these opaque types, the database server automatically invokes destroy( ) for the opaque type. This function decides how to remove the data, regardless of where it is stored. For more information on the destroy( ) support function, see IBM Informix User-Defined Routines and Data Types Developer's Guide.
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