A scalar function should implement the processing method computeValue, in addition to those related to custom context, in the following structure:
struct UdfScalarFunctionPointers
{
void* customContext;
void (*releaseCustomContext)(
void* customContext
);
SqlmrErrorH (*computeValue)(
SqlmrTaskContextH taskContext,
void* customContext,
SqlmrRowViewH input,
SqlmrValueHolderH outValueHolder
) SQLMR_ERROR_RESULT;
};
The following table describes the member variables or methods used in the structure above:
| Member Name | Type | Description |
|---|---|---|
| customContext | variable | Points to a space that stores value for the argument clauses to the scalar function, or information about input data type. |
| releaseCustomContext | method | Releases the custom context once the task is complete. |
| computeValue | method | Performs processing on the given row and emits the result. |