Ingres 11.0 | hmax Routine--Create Histogram Value for Maximum Value

Object Management Extension User Guide > Object Management Extension User Guide > Defining Data Types > hmax Routine--Create Histogram Value for Maximum Value

Was this helpful?

hmax Routine--Create Histogram Value for Maximum Value

This routine is used by the optimizer to obtain the histogram value for the largest value of a type. Place the address of this routine in the dtd_hmax_addr field of the IIADD_DT_DFN structure. If the II_DT_NOHISTOGRAM attribute is present, then this routine is not necessary.

Inputs

The inputs for this function are:

scb

Pointer to an SCB

dv_from

Pointer to a datavalue describing the type and length of the desired histogram value

dv_histogram

Pointer to a datavalue for the histogram

Outputs

The outputs for this function are:

*(dv_histogram-db_data)

Contains the histogram value

Returns

II_STATUS

Last modified date: 01/30/2023