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MCOL-3503 add MODA aggregate function

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This commit is contained in:
David Hall
2019-09-27 12:22:44 -05:00
parent 1f475340dc
commit cbef44a0be
9 changed files with 1042 additions and 6 deletions
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288
utils/regr/modamysql.cpp Normal file
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#include <my_config.h>
#include <cmath>
#include <iostream>
#include <sstream>
#include <string.h>
#include <tr1/unordered_map>
#include <algorithm>
#include "idb_mysql.h"
namespace
{
inline bool isNumeric(int type, const char* attr)
{
if (type == INT_RESULT || type == REAL_RESULT || type == DECIMAL_RESULT)
{
return true;
}
#if _MSC_VER
if (_strnicmp("NULL", attr, 4) == 0))
#else
if (strncasecmp("NULL", attr, 4) == 0)
#endif
{
return true;
}
return false;
}
struct moda_data
{
long double fSum;
uint64_t fCount;
enum Item_result fReturnType;
std::tr1::unordered_map<int64_t, uint32_t> mapINT;
std::tr1::unordered_map<double, uint32_t> mapREAL;
std::tr1::unordered_map<long double, uint32_t> mapDECIMAL;
void clear()
{
fSum = 0.0;
fCount = 0;
mapINT.clear();
mapREAL.clear();
mapDECIMAL.clear();
}
};
}
extern "C"
{
#ifdef _MSC_VER
__declspec(dllexport)
#endif
my_bool moda_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
{
struct moda_data* data;
if (args->arg_count != 1)
{
strcpy(message,"moda() requires one argument");
return 1;
}
if (!isNumeric(args->arg_type[0], args->attributes[0]))
{
strcpy(message,"moda() with a non-numeric argument");
return 1;
}
data = new moda_data;
data->fReturnType = args->arg_type[0];
data->fCount = 0;
data->fSum = 0.0;
initid->ptr = (char*)data;
return 0;
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void moda_deinit(UDF_INIT* initid)
{
struct moda_data* data = (struct moda_data*)initid->ptr;
data->clear();
delete data;
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void moda_clear(UDF_INIT* initid, char* is_null __attribute__((unused)),
char* message __attribute__((unused)))
{
struct moda_data* data = (struct moda_data*)initid->ptr;
data->clear();
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void moda_add(UDF_INIT* initid,
UDF_ARGS* args,
char* is_null,
char* message __attribute__((unused)))
{
// Test for NULL
if (args->args[0] == 0)
{
return;
}
struct moda_data* data = (struct moda_data*)initid->ptr;
data->fCount++;
switch (args->arg_type[0])
{
case INT_RESULT:
{
int64_t val = *((int64_t*)args->args[0]);
data->fSum += (long double)val;
data->mapINT[val]++;
break;
}
case REAL_RESULT:
{
double val = *((double*)args->args[0]);
data->fSum += val;
data->mapREAL[val]++;
break;
}
case DECIMAL_RESULT:
case STRING_RESULT:
{
long double val = strtold(args->args[0], 0);
data->fSum += val;
data->mapDECIMAL[val]++;
break;
}
default:
break;
}
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
void moda_remove(UDF_INIT* initid, UDF_ARGS* args,
char* is_null,
char* message __attribute__((unused)))
{
// Test for NULL
if (args->args[0] == 0)
{
return;
}
struct moda_data* data = (struct moda_data*)initid->ptr;
data->fCount--;
switch (args->arg_type[0])
{
case INT_RESULT:
{
int64_t val = *((int64_t*)args->args[0]);
data->fSum -= (long double)val;
data->mapINT[val]--;
break;
}
case REAL_RESULT:
{
double val = *((double*)args->args[0]);
data->fSum -= val;
data->mapREAL[val]--;
break;
}
case DECIMAL_RESULT:
case STRING_RESULT:
{
long double val = strtold(args->args[0], 0);
data->fSum -= val;
data->mapDECIMAL[val]--;
break;
}
default:
break;
}
}
#ifdef _MSC_VER
__declspec(dllexport)
#endif
char* moda(UDF_INIT* initid, UDF_ARGS* args __attribute__((unused)),
char* is_null, char* error __attribute__((unused)))
{
struct moda_data* data = (struct moda_data*)initid->ptr;
uint32_t maxCnt = 0.0;
switch (args->arg_type[0])
{
case INT_RESULT:
{
typename std::tr1::unordered_map<int64_t, uint32_t>::iterator iter;
int64_t avg = (int64_t)data->fCount ? data->fSum / data->fCount : 0;
int64_t val = 0.0;
for (iter = data->mapINT.begin(); iter != data->mapINT.end(); ++iter)
{
if (iter->second > maxCnt)
{
val = iter->first;
maxCnt = iter->second;
}
else if (iter->second == maxCnt)
{
// Tie breaker: choose the closest to avg. If still tie, choose smallest
if ((abs(val-avg) > abs(iter->first-avg))
|| ((abs(val-avg) == abs(iter->first-avg)) && (abs(val) > abs(iter->first))))
{
val = iter->first;
}
}
}
std::ostringstream oss;
oss << val;
return const_cast<char*>(oss.str().c_str());
break;
}
case REAL_RESULT:
{
typename std::tr1::unordered_map<double, uint32_t>::iterator iter;
double avg = data->fCount ? data->fSum / data->fCount : 0;
double val = 0.0;
for (iter = data->mapREAL.begin(); iter != data->mapREAL.end(); ++iter)
{
if (iter->second > maxCnt)
{
val = iter->first;
maxCnt = iter->second;
}
else if (iter->second == maxCnt)
{
// Tie breaker: choose the closest to avg. If still tie, choose smallest
if ((abs(val-avg) > abs(iter->first-avg))
|| ((abs(val-avg) == abs(iter->first-avg)) && (abs(val) > abs(iter->first))))
{
val = iter->first;
}
}
}
std::ostringstream oss;
oss << val;
return const_cast<char*>(oss.str().c_str());
break;
}
case DECIMAL_RESULT:
case STRING_RESULT:
{
typename std::tr1::unordered_map<long double, uint32_t>::iterator iter;
long double avg = data->fCount ? data->fSum / data->fCount : 0;
long double val = 0.0;
for (iter = data->mapDECIMAL.begin(); iter != data->mapDECIMAL.end(); ++iter)
{
if (iter->second > maxCnt)
{
val = iter->first;
maxCnt = iter->second;
}
else if (iter->second == maxCnt)
{
long double thisVal = iter->first;
// Tie breaker: choose the closest to avg. If still tie, choose smallest
if ((abs(val-avg) > abs(thisVal-avg))
|| ((abs(val-avg) == abs(thisVal-avg)) && (abs(val) > abs(thisVal))))
{
val = thisVal;
}
}
}
std::ostringstream oss;
oss << val;
return const_cast<char*>(oss.str().c_str());
break;
}
default:
break;
}
return NULL;
}
} // Extern "C"