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@ -26,11 +26,11 @@ using namespace mcsv1sdk;
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class Add_regr_intercept_ToUDAFMap
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{
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public:
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Add_regr_intercept_ToUDAFMap()
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{
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UDAFMap::getMap()["regr_intercept"] = new regr_intercept();
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}
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public:
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Add_regr_intercept_ToUDAFMap()
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{
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UDAFMap::getMap()["regr_intercept"] = new regr_intercept();
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}
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};
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static Add_regr_intercept_ToUDAFMap addToMap;
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@ -38,123 +38,120 @@ static Add_regr_intercept_ToUDAFMap addToMap;
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// Use the simple data model
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struct regr_intercept_data
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{
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uint64_t cnt;
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long double sumx;
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long double sumx2; // sum of (x squared)
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long double sumy;
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long double sumxy; // sum of x * y
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uint64_t cnt;
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long double sumx;
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long double sumx2; // sum of (x squared)
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long double sumy;
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long double sumxy; // sum of x * y
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};
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mcsv1_UDAF::ReturnCode regr_intercept::init(mcsv1Context* context,
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ColumnDatum* colTypes)
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mcsv1_UDAF::ReturnCode regr_intercept::init(mcsv1Context* context, ColumnDatum* colTypes)
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{
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if (context->getParameterCount() != 2)
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{
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// The error message will be prepended with
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// "The storage engine for the table doesn't support "
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context->setErrorMessage("regr_intercept() with other than 2 arguments");
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return mcsv1_UDAF::ERROR;
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}
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if (!(isNumeric(colTypes[0].dataType) && isNumeric(colTypes[1].dataType)))
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{
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// The error message will be prepended with
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// "The storage engine for the table doesn't support "
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context->setErrorMessage("regr_intercept() with non-numeric arguments");
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return mcsv1_UDAF::ERROR;
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}
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context->setUserDataSize(sizeof(regr_intercept_data));
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context->setResultType(execplan::CalpontSystemCatalog::DOUBLE);
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context->setColWidth(8);
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context->setScale(DECIMAL_NOT_SPECIFIED);
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context->setPrecision(0);
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context->setRunFlag(mcsv1sdk::UDAF_IGNORE_NULLS);
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return mcsv1_UDAF::SUCCESS;
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if (context->getParameterCount() != 2)
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{
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// The error message will be prepended with
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// "The storage engine for the table doesn't support "
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context->setErrorMessage("regr_intercept() with other than 2 arguments");
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return mcsv1_UDAF::ERROR;
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}
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if (!(isNumeric(colTypes[0].dataType) && isNumeric(colTypes[1].dataType)))
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{
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// The error message will be prepended with
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// "The storage engine for the table doesn't support "
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context->setErrorMessage("regr_intercept() with non-numeric arguments");
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return mcsv1_UDAF::ERROR;
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}
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context->setUserDataSize(sizeof(regr_intercept_data));
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context->setResultType(execplan::CalpontSystemCatalog::DOUBLE);
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context->setColWidth(8);
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context->setScale(DECIMAL_NOT_SPECIFIED);
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context->setPrecision(0);
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context->setRunFlag(mcsv1sdk::UDAF_IGNORE_NULLS);
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return mcsv1_UDAF::SUCCESS;
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}
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mcsv1_UDAF::ReturnCode regr_intercept::reset(mcsv1Context* context)
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{
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struct regr_intercept_data* data = (struct regr_intercept_data*)context->getUserData()->data;
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data->cnt = 0;
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data->sumx = 0.0;
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data->sumx2 = 0.0;
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data->sumy = 0.0;
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data->sumxy = 0.0;
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return mcsv1_UDAF::SUCCESS;
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struct regr_intercept_data* data = (struct regr_intercept_data*)context->getUserData()->data;
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data->cnt = 0;
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data->sumx = 0.0;
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data->sumx2 = 0.0;
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data->sumy = 0.0;
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data->sumxy = 0.0;
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return mcsv1_UDAF::SUCCESS;
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}
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mcsv1_UDAF::ReturnCode regr_intercept::nextValue(mcsv1Context* context, ColumnDatum* valsIn)
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{
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double valy = toDouble(valsIn[0]);
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double valx = toDouble(valsIn[1]);
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struct regr_intercept_data* data = (struct regr_intercept_data*)context->getUserData()->data;
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double valy = toDouble(valsIn[0]);
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double valx = toDouble(valsIn[1]);
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struct regr_intercept_data* data = (struct regr_intercept_data*)context->getUserData()->data;
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data->sumy += valy;
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data->sumx += valx;
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data->sumx2 += valx*valx;
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data->sumy += valy;
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data->sumx += valx;
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data->sumx2 += valx * valx;
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data->sumxy += valx*valy;
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++data->cnt;
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return mcsv1_UDAF::SUCCESS;
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data->sumxy += valx * valy;
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++data->cnt;
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return mcsv1_UDAF::SUCCESS;
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}
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mcsv1_UDAF::ReturnCode regr_intercept::subEvaluate(mcsv1Context* context, const UserData* userDataIn)
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{
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if (!userDataIn)
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{
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return mcsv1_UDAF::SUCCESS;
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}
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struct regr_intercept_data* outData = (struct regr_intercept_data*)context->getUserData()->data;
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struct regr_intercept_data* inData = (struct regr_intercept_data*)userDataIn->data;
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outData->sumx += inData->sumx;
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outData->sumx2 += inData->sumx2;
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outData->sumy += inData->sumy;
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outData->sumxy += inData->sumxy;
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outData->cnt += inData->cnt;
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if (!userDataIn)
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{
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return mcsv1_UDAF::SUCCESS;
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}
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struct regr_intercept_data* outData = (struct regr_intercept_data*)context->getUserData()->data;
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struct regr_intercept_data* inData = (struct regr_intercept_data*)userDataIn->data;
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outData->sumx += inData->sumx;
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outData->sumx2 += inData->sumx2;
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outData->sumy += inData->sumy;
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outData->sumxy += inData->sumxy;
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outData->cnt += inData->cnt;
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return mcsv1_UDAF::SUCCESS;
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}
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mcsv1_UDAF::ReturnCode regr_intercept::evaluate(mcsv1Context* context, static_any::any& valOut)
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{
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struct regr_intercept_data* data = (struct regr_intercept_data*)context->getUserData()->data;
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long double N = data->cnt;
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if (N > 1)
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struct regr_intercept_data* data = (struct regr_intercept_data*)context->getUserData()->data;
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long double N = data->cnt;
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if (N > 1)
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{
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long double sumx = data->sumx;
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long double sumy = data->sumy;
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long double sumx2 = data->sumx2;
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long double sumxy = data->sumxy;
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// regr_intercept is AVG(y) - slope(y,x)*avg(x)
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// We do some algebra and we can get a slightly smaller calculation
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long double numerator = sumy * sumx2 - sumx * sumxy;
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long double var_pop =
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(N * sumx2) - (sumx * sumx); // Not realy var_pop, but sort of after some reductions
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if (var_pop > 0)
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{
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long double sumx = data->sumx;
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long double sumy = data->sumy;
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long double sumx2 = data->sumx2;
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long double sumxy = data->sumxy;
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// regr_intercept is AVG(y) - slope(y,x)*avg(x)
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// We do some algebra and we can get a slightly smaller calculation
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long double numerator = sumy * sumx2 - sumx * sumxy;
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long double var_pop = (N * sumx2) - (sumx * sumx); // Not realy var_pop, but sort of after some reductions
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if (var_pop > 0)
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{
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valOut = static_cast<double>(numerator / var_pop);
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}
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valOut = static_cast<double>(numerator / var_pop);
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}
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return mcsv1_UDAF::SUCCESS;
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}
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return mcsv1_UDAF::SUCCESS;
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}
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mcsv1_UDAF::ReturnCode regr_intercept::dropValue(mcsv1Context* context, ColumnDatum* valsDropped)
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{
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double valy = toDouble(valsDropped[0]);
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double valx = toDouble(valsDropped[1]);
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struct regr_intercept_data* data = (struct regr_intercept_data*)context->getUserData()->data;
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double valy = toDouble(valsDropped[0]);
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double valx = toDouble(valsDropped[1]);
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struct regr_intercept_data* data = (struct regr_intercept_data*)context->getUserData()->data;
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data->sumy -= valy;
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data->sumx -= valx;
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data->sumx2 -= valx*valx;
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data->sumy -= valy;
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data->sumx -= valx;
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data->sumx2 -= valx * valx;
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data->sumxy -= valx*valy;
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--data->cnt;
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data->sumxy -= valx * valy;
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--data->cnt;
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return mcsv1_UDAF::SUCCESS;
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return mcsv1_UDAF::SUCCESS;
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}
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