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This chapter describes how to write C user-defined routines
(UDRs) with the following purposes.
- Type of UDR
- More Information
- Cast function
- page Writing
a Cast Function
- Cost function
- page Writing
Selectivity and Cost Functions
- End-user routine
- page Writing
an End-User Routine
- Iterator function
- page Writing
an Iterator Function
- Negator function
- page Creating
Negator Functions
- Parallelizable UDR
- page Creating
Parallelizable UDRs
- Selectivity function
- page Writing
Selectivity and Cost Functions
- User-defined aggregates
- page Writing
an Aggregate Function
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