Ingres 11.0 | hmin Routine--Create Histogram Value for Minimum Value

Object Management Extension User Guide > Object Management Extension User Guide > Defining Data Types > hmin Routine--Create Histogram Value for Minimum Value

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hmin Routine--Create Histogram Value for Minimum Value

This routine is used by the optimizer to obtain the histogram value for the smallest value of a type. For a discussion of histograms, see helem Routine.

Note: The smallest value for the given data type is expected to be known implicitly by the routine.

Place the address of this routine in the dtd_hmim_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 SCB

dv_from

Pointer to a datavalue describing the type and length of the user-typed 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