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udf_geomean.cc
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udf_geomean.cc
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/*
returns the geometric mean of values
input parameters:
data (real)
number of decimals in result (int, optional)
output:
geometric mean of the values (real)
registering the function:
CREATE AGGREGATE FUNCTION geomean RETURNS REAL SONAME 'udf_geomean.so';
getting rid of the function:
DROP FUNCTION geomean;
*/
#ifdef STANDARD
#include <stdio.h>
#include <string.h>
#ifdef __WIN__
typedef unsigned __int64 ulonglong;
typedef __int64 longlong;
#else
typedef unsigned long long ulonglong;
typedef long long longlong;
#endif /*__WIN__*/
#else
#include <my_global.h>
#include <my_sys.h>
#endif
#include <mysql.h>
#include <m_ctype.h>
#include <m_string.h>
#ifdef HAVE_DLOPEN
extern "C" {
my_bool geomean_init( UDF_INIT* initid, UDF_ARGS* args, char* message );
void geomean_deinit( UDF_INIT* initid );
void geomean_clear( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char* is_error );
void geomean_reset( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char *error );
void geomean_add( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char *error );
double geomean( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char *error );
}
struct geomean_data
{
unsigned long count;
bool isset;
double value;
};
my_bool geomean_init( UDF_INIT* initid, UDF_ARGS* args, char* message ) {
if (args->arg_count < 1 || args->arg_count>2) {
strcpy(message,"wrong number of arguments: geomean() requires one or two arguments");
return 1;
}
if (args->arg_type[0] == INT_RESULT) {
args->arg_type[0] = REAL_RESULT;
}
if (args->arg_type[0] != REAL_RESULT) {
strcpy(message,"geomean() requires a real as parameter 1");
return 1;
}
if (args->arg_count>1 && (args->arg_type[1] != INT_RESULT)) {
strcpy(message,"geomean() requires an int as parameter 2");
return 1;
}
initid->decimals = 2;
if (args->arg_count == 2 && (*((ulong*)args->args[1]) <= 16)) {
initid->decimals = *((ulong*)args->args[1]);
}
geomean_data *buffer = new geomean_data;
buffer->count = 0;
buffer->value = 0;
buffer->isset = false;
initid->maybe_null = 1;
initid->max_length = 32;
initid->ptr = (char*)buffer;
return 0;
}
void geomean_deinit( UDF_INIT* initid )
{
delete initid->ptr;
}
void geomean_clear( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char* is_error )
{
geomean_data *buffer = (geomean_data*)initid->ptr;
buffer->count = 0;
buffer->value=0;
buffer->isset=false;
*is_null = 0;
*is_error = 0;
}
void geomean_reset( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char* is_error )
{
geomean_clear( initid, args, is_null, is_error );
geomean_add( initid, args, is_null, is_error );
}
void geomean_add( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char* is_error )
{
if (args->args[0]!=NULL)
{
double value;
geomean_data *buffer = (geomean_data*)initid->ptr;
value=(double) *((double*) args->args[0]);
buffer->count++;
if (buffer->isset)
{
buffer->value*=value;
} else
{
buffer->value=value;
buffer->isset=true;
}
}
}
double geomean( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char* is_error )
{
geomean_data* buffer = (geomean_data*)initid->ptr;
if (buffer->count==0 || *is_error!=0)
{
*is_null = 1;
return 0.0;
}
*is_null=0;
if (buffer->count==1)
{
return buffer->value;
}
return (double) pow(buffer->value,1.0/buffer->count);
}
#endif