Max

The function interface declaration is as follows:

HmppResult HMPPS_AggMax_bool(const bool *src, int32_t len, int8_t *nullAddr, bool *max);

HmppResult HMPPS_AggMax_varchar(const varchar *src, const int32_t *offset, int32_t len, varchar *max, int32_t *maxLen);

HmppResult HMPPS_AggMax_16s(const int16_t *src, int32_t len, int8_t *nullAddr, int16_t *max);

HmppResult HMPPS_AggMax_32s(const int32_t *src, int32_t len, int8_t *nullAddr, int32_t *max);

HmppResult HMPPS_AggMax_64s(const int64_t *src, int32_t len, int8_t *nullAddr, int64_t *max);

HmppResult HMPPS_AggMax_64f(const double *src, int32_t len, int8_t *nullAddr, double *max);

HmppResult HMPPS_AggMax_decimal128(const HmppDecimal128 *src, int32_t len, int8_t *nullAddr, HmppDecimal128 *max);

Parameters

Parameter	Description	Value Range	Input/Output
src	Pointer to the source vector	The value cannot be NULL.	Input
len	Vector length	(0,INT_MAX]	Input
nullAddr	Pointer to a null address If the value of nullAddr is a null pointer, all elements in the src vector are used for the calculation. Otherwise, when nullAddr[i] = 0, elements in src[i] (i indicates the index) are used for the calculation.	This field can be NULL.	Input
offset	Pointer to the offset address of the substring	The value cannot be NULL.	Input
max	Pointer to the result	The value cannot be NULL.	Output
maxlen	Pointer to the length of the result string	The value cannot be NULL.	Output

When using the HMPPS_AggMax_varchar function, ensure sufficient memory for max to prevent segmentation faults. You are advised to allocate the same memory size for max as that for src.

#include <stdio.h>
#include "hmpp.h"
#define BUFFER_SIZE_T 10

int main() {
    int64_t src[BUFFER_SIZE_T] = {3, 6, 2, 8, 3, 15, 56, 31, 1, 23};
    int8_t nullAddr[BUFFER_SIZE_T] = {0, 1, 0, 0, 0, 0, 1, 0, 0, 0};
    int64_t max;
    HmppResult result = HMPPS_AggMax_64s(src, BUFFER_SIZE_T, nullAddr, &max);
    printf("result = %d  ", result);
    if (result != HMPP_STS_NO_ERR) {
        return 0;
    }
    printf("max = %ld\n", max);

result = 0  max = 31