| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| <@pp.dropOutputFile /> |
| |
| |
| |
| <#list corrTypes.correlationTypes as aggrtype> |
| <@pp.changeOutputFile name="/org/apache/drill/exec/expr/fn/impl/gaggr/${aggrtype.className}Functions.java" /> |
| |
| <#include "/@includes/license.ftl" /> |
| |
| <#-- A utility class that is used to generate java code for corr/correlation aggr functions --> |
| |
| /* |
| * This class is automatically generated from CorrelationTypes.tdd using FreeMarker. |
| */ |
| |
| package org.apache.drill.exec.expr.fn.impl.gaggr; |
| |
| import org.apache.drill.exec.expr.DrillAggFunc; |
| import org.apache.drill.exec.expr.annotations.FunctionTemplate; |
| import org.apache.drill.exec.expr.annotations.FunctionTemplate.NullHandling; |
| import org.apache.drill.exec.expr.annotations.FunctionTemplate.FunctionScope; |
| import org.apache.drill.exec.expr.annotations.Output; |
| import org.apache.drill.exec.expr.annotations.Param; |
| import org.apache.drill.exec.expr.annotations.Workspace; |
| import org.apache.drill.exec.expr.holders.BigIntHolder; |
| import org.apache.drill.exec.expr.holders.NullableBigIntHolder; |
| import org.apache.drill.exec.expr.holders.IntHolder; |
| import org.apache.drill.exec.expr.holders.NullableIntHolder; |
| import org.apache.drill.exec.expr.holders.SmallIntHolder; |
| import org.apache.drill.exec.expr.holders.NullableSmallIntHolder; |
| import org.apache.drill.exec.expr.holders.TinyIntHolder; |
| import org.apache.drill.exec.expr.holders.NullableTinyIntHolder; |
| import org.apache.drill.exec.expr.holders.UInt1Holder; |
| import org.apache.drill.exec.expr.holders.NullableUInt1Holder; |
| import org.apache.drill.exec.expr.holders.UInt2Holder; |
| import org.apache.drill.exec.expr.holders.NullableUInt2Holder; |
| import org.apache.drill.exec.expr.holders.UInt4Holder; |
| import org.apache.drill.exec.expr.holders.NullableUInt4Holder; |
| import org.apache.drill.exec.expr.holders.UInt8Holder; |
| import org.apache.drill.exec.expr.holders.NullableUInt8Holder; |
| import org.apache.drill.exec.record.RecordBatch; |
| import org.apache.drill.exec.expr.holders.NullableFloat8Holder; |
| import org.apache.drill.exec.expr.holders.NullableFloat4Holder; |
| import org.apache.drill.exec.expr.holders.Float8Holder; |
| import org.apache.drill.exec.expr.holders.Float4Holder; |
| |
| /* |
| * This class is generated using freemarker and the ${.template_name} template. |
| */ |
| |
| @SuppressWarnings("unused") |
| |
| public class ${aggrtype.className}Functions { |
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(${aggrtype.className}Functions.class); |
| |
| <#list aggrtype.types as type> |
| |
| @FunctionTemplate(names = {"${aggrtype.funcName}", "${aggrtype.aliasName}"}, scope = FunctionTemplate.FunctionScope.POINT_AGGREGATE) |
| public static class ${type.inputType}${aggrtype.className} implements DrillAggFunc{ |
| |
| @Param ${type.inputType}Holder xIn; |
| @Param ${type.inputType}Holder yIn; |
| |
| @Workspace ${type.movingAverageType}Holder xMean; |
| @Workspace ${type.movingAverageType}Holder yMean; |
| @Workspace ${type.movingAverageType}Holder xyMean; |
| |
| @Workspace ${type.movingAverageType}Holder xDev; |
| @Workspace ${type.movingAverageType}Holder yDev; |
| |
| @Workspace ${type.movingDeviationType}Holder covar; |
| |
| @Workspace ${type.countRunningType}Holder count; |
| @Output ${type.outputType}Holder out; |
| |
| public void setup() { |
| xMean = new ${type.movingAverageType}Holder(); |
| yMean = new ${type.movingAverageType}Holder(); |
| xyMean = new ${type.movingDeviationType}Holder(); |
| xDev = new ${type.movingDeviationType}Holder(); |
| yDev = new ${type.movingDeviationType}Holder(); |
| count = new ${type.countRunningType}Holder(); |
| covar = new ${type.movingDeviationType}Holder(); |
| |
| // Initialize the workspace variables |
| xMean.value = 0; |
| yMean.value = 0; |
| xyMean.value = 0; |
| xDev.value = 0; |
| yDev.value = 0; |
| count.value = 1; |
| covar.value = 0; |
| } |
| |
| @Override |
| public void add() { |
| <#if type.inputType?starts_with("Nullable")> |
| sout: { |
| if (xIn.isSet == 0 || yIn.isSet == 0) { |
| // processing nullable input and the value is null, so don't do anything... |
| break sout; |
| } |
| </#if> |
| |
| // compute covariance |
| double xOldMean = xMean.value, yOldMean = yMean.value; |
| |
| xMean.value += ((xIn.value - xMean.value) / count.value); |
| yMean.value += ((yIn.value - yMean.value) / count.value); |
| |
| xDev.value += (xIn.value - xOldMean) * (xIn.value - xMean.value); |
| yDev.value += (yIn.value - yOldMean) * (yIn.value - yMean.value); |
| |
| xyMean.value += ((xIn.value * yIn.value) - xyMean.value) / count.value; |
| count.value++; |
| <#if type.inputType?starts_with("Nullable")> |
| } // end of sout block |
| </#if> |
| } |
| |
| @Override |
| public void output() { |
| double xVariance = (xDev.value / (count.value - 1)); |
| double yVariance = (yDev.value / (count.value - 1)); |
| double xyCovariance = (xyMean.value - (xMean.value * yMean.value)); |
| |
| out.value = xyCovariance / Math.sqrt((xVariance * yVariance)); |
| } |
| |
| @Override |
| public void reset() { |
| xMean.value = 0; |
| yMean.value = 0; |
| xyMean.value = 0; |
| count.value = 1; |
| covar.value = 0; |
| } |
| } |
| |
| |
| </#list> |
| } |
| </#list> |