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mariadb-columnstore-engine/utils/regr/regrmysql.cpp

375 lines
8.9 KiB
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#include <my_config.h>
#include <cmath>
#include <iostream>
#include <sstream>
using namespace std;
#include "idb_mysql.h"
namespace
{
inline double cvtArgToDouble(int t, const char* v)
{
double d = 0.0;
switch (t)
{
case INT_RESULT:
d = (double)(*((long long*)v));
break;
case REAL_RESULT:
d = *((double*)v);
break;
case DECIMAL_RESULT:
case STRING_RESULT:
d = strtod(v, 0);
break;
case ROW_RESULT:
break;
}
return d;
}
inline long long cvtArgToInt(int t, const char* v)
{
long long ll = 0;
switch (t)
{
case INT_RESULT:
ll = *((long long*)v);
break;
case REAL_RESULT:
ll = (long long)(*((double*)v));
break;
case DECIMAL_RESULT:
case STRING_RESULT:
ll = strtoll(v, 0, 0);
break;
case ROW_RESULT:
break;
}
return ll;
}
inline string cvtArgToString(int t, const char* v)
{
string str;
switch (t)
{
case INT_RESULT:
{
long long ll;
ll = *((long long*)v);
ostringstream oss;
oss << ll;
str = oss.str();
break;
}
case REAL_RESULT:
{
double d;
d = *((double*)v);
ostringstream oss;
oss << d;
str = oss.str();
break;
}
case DECIMAL_RESULT:
case STRING_RESULT:
str = v;
break;
case ROW_RESULT:
break;
}
return str;
}
}
/****************************************************************************
* UDF function interface for MariaDB connector to recognize is defined in
* this section. MariaDB's UDF function creation guideline needs to be followed.
*
* Three interface need to be defined on the connector for each UDF function.
*
* XXX_init: To allocate the necessary memory for the UDF function and validate
* the input.
* XXX_deinit: To clean up the memory.
* XXX: The function implementation.
* Detailed instruction can be found at MariaDB source directory:
* ~/sql/udf_example.cc.
*
* Please note that the implementation of the function defined on the connector
* will only be called when all the input arguments are constant. e.g.,
* mcs_add(2,3). That way, the function does not run in a distributed fashion
* and could be slow. If there is a need for the UDF function to run with
* pure constant input, then one needs to put a implementation in the XXX
* body, which is very similar to the ones in getXXXval API. If there's no
* such need for a given UDF, then the XXX interface can just return a dummy
* result because this function will never be called.
*/
extern "C"
{
//=======================================================================
/**
* regr_avgx connector stub
*/
struct regr_avgx_data
{
double sumx;
int64_t cnt;
};
#ifdef _MSC_VER
__declspec(dllexport)
#endif
my_bool regr_avgx_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
{
struct regr_avgx_data* data;
if (args->arg_count != 2)
{
strcpy(message,"regr_avgx() requires two arguments");
return 1;
}
if (!(data = (struct regr_avgx_data*) malloc(sizeof(struct regr_avgx_data))))
{
strmov(message,"Couldn't allocate memory");
return 1;
}
data->sumx = 0;
data->cnt = 0;
initid->ptr = (char*)data;
return 0;
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void regr_avgx_deinit(UDF_INIT* initid)
{
free(initid->ptr);
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void
regr_avgx_clear(UDF_INIT* initid, char* is_null __attribute__((unused)),
char* message __attribute__((unused)))
{
struct regr_avgx_data* data = (struct regr_avgx_data*)initid->ptr;
data->sumx = 0;
data->cnt = 0;
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void
regr_avgx_add(UDF_INIT* initid, UDF_ARGS* args,
char* is_null,
char* message __attribute__((unused)))
{
// Test for NULL in x and y
if (args->args[0] == 0 || args->args[1] == 0)
{
return;
}
struct regr_avgx_data* data = (struct regr_avgx_data*)initid->ptr;
double xval = cvtArgToDouble(args->arg_type[1], args->args[1]);
++data->cnt;
data->sumx += xval;
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
long long regr_avgx(UDF_INIT* initid, UDF_ARGS* args __attribute__((unused)),
char* is_null, char* error __attribute__((unused)))
{
struct regr_avgx_data* data = (struct regr_avgx_data*)initid->ptr;
return data->sumx / data->cnt;
}
//=======================================================================
/**
* regr_avgy connector stub
*/
struct regr_avgy_data
{
double sumy;
int64_t cnt;
};
#ifdef _MSC_VER
__declspec(dllexport)
#endif
my_bool regr_avgy_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
{
struct regr_avgy_data* data;
if (args->arg_count != 2)
{
strcpy(message,"regr_avgy() requires two arguments");
return 1;
}
if (!(data = (struct regr_avgy_data*) malloc(sizeof(struct regr_avgy_data))))
{
strmov(message,"Couldn't allocate memory");
return 1;
}
data->sumy = 0;
data->cnt = 0;
initid->ptr = (char*)data;
return 0;
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void regr_avgy_deinit(UDF_INIT* initid)
{
free(initid->ptr);
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void
regr_avgy_clear(UDF_INIT* initid, char* is_null __attribute__((unused)),
char* message __attribute__((unused)))
{
struct regr_avgy_data* data = (struct regr_avgy_data*)initid->ptr;
data->sumy = 0;
data->cnt = 0;
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void
regr_avgy_add(UDF_INIT* initid, UDF_ARGS* args,
char* is_null,
char* message __attribute__((unused)))
{
// Test for NULL in x and y
if (args->args[0] == 0 || args->args[1] == 0)
{
return;
}
struct regr_avgy_data* data = (struct regr_avgy_data*)initid->ptr;
double yval = cvtArgToDouble(args->arg_type[0], args->args[0]);
++data->cnt;
data->sumy += yval;
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
long long regr_avgy(UDF_INIT* initid, UDF_ARGS* args __attribute__((unused)),
char* is_null, char* error __attribute__((unused)))
{
struct regr_avgy_data* data = (struct regr_avgy_data*)initid->ptr;
return data->sumy / data->cnt;
}
//=======================================================================
/**
* regr_count connector stub
*/
struct regr_count_data
{
int64_t cnt;
};
#ifdef _MSC_VER
__declspec(dllexport)
#endif
my_bool regr_count_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
{
struct regr_count_data* data;
if (args->arg_count != 2)
{
strcpy(message,"regr_count() requires two arguments");
return 1;
}
if (!(data = (struct regr_count_data*) malloc(sizeof(struct regr_count_data))))
{
strmov(message,"Couldn't allocate memory");
return 1;
}
data->cnt = 0;
initid->ptr = (char*)data;
return 0;
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void regr_count_deinit(UDF_INIT* initid)
{
free(initid->ptr);
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void
regr_count_clear(UDF_INIT* initid, char* is_null __attribute__((unused)),
char* message __attribute__((unused)))
{
struct regr_count_data* data = (struct regr_count_data*)initid->ptr;
data->cnt = 0;
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void
regr_count_add(UDF_INIT* initid, UDF_ARGS* args,
char* is_null,
char* message __attribute__((unused)))
{
// Test for NULL in x and y
if (args->args[0] == 0 || args->args[1] == 0)
{
return;
}
struct regr_count_data* data = (struct regr_count_data*)initid->ptr;
++data->cnt;
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
long long regr_count(UDF_INIT* initid, UDF_ARGS* args __attribute__((unused)),
char* is_null, char* error __attribute__((unused)))
{
struct regr_count_data* data = (struct regr_count_data*)initid->ptr;
return data->cnt;
}
//=======================================================================
}
// vim:ts=4 sw=4:
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