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DRILL-6375 : Support for ANY_VALUE aggregate function
closes #1256
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| /* | ||
| * 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 /> | ||
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| <#list aggrtypes1.aggrtypes as aggrtype> | ||
| <@pp.changeOutputFile name="/org/apache/drill/exec/expr/fn/impl/gaggr/${aggrtype.className}ComplexFunctions.java" /> | ||
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| <#include "/@includes/license.ftl" /> | ||
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| /* | ||
| * This class is generated using freemarker and the ${.template_name} template. | ||
| */ | ||
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| <#-- A utility class that is used to generate java code for aggr functions that maintain a single --> | ||
| <#-- running counter to hold the result. This includes: ANY_VALUE. --> | ||
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| package org.apache.drill.exec.expr.fn.impl.gaggr; | ||
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| import org.apache.drill.exec.expr.DrillAggFunc; | ||
| import org.apache.drill.exec.expr.annotations.FunctionTemplate; | ||
| 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.*; | ||
| import org.apache.drill.exec.vector.complex.reader.FieldReader; | ||
| import org.apache.drill.exec.vector.complex.MapUtility; | ||
| import org.apache.drill.exec.vector.complex.writer.*; | ||
| import org.apache.drill.exec.vector.complex.writer.BaseWriter.*; | ||
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| @SuppressWarnings("unused") | ||
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| public class ${aggrtype.className}ComplexFunctions { | ||
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(${aggrtype.className}ComplexFunctions.class); | ||
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| <#list aggrtype.types as type> | ||
| <#if type.major == "Complex"> | ||
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| @FunctionTemplate(name = "${aggrtype.funcName}", scope = FunctionTemplate.FunctionScope.POINT_AGGREGATE) | ||
| public static class ${type.inputType}${aggrtype.className} implements DrillAggFunc{ | ||
| @Param ${type.inputType}Holder inHolder; | ||
| @Workspace BigIntHolder nonNullCount; | ||
| @Output ComplexWriter writer; | ||
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| public void setup() { | ||
| nonNullCount = new BigIntHolder(); | ||
| nonNullCount.value = 0; | ||
| } | ||
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| @Override | ||
| public void add() { | ||
| <#if type.inputType?starts_with("Nullable")> | ||
| sout: { | ||
| if (inHolder.isSet == 0) { | ||
| // processing nullable input and the value is null, so don't do anything... | ||
| break sout; | ||
| } | ||
| </#if> | ||
| <#if aggrtype.funcName == "any_value"> | ||
| <#if type.runningType?starts_with("Map")> | ||
| if (nonNullCount.value == 0) { | ||
| org.apache.drill.exec.expr.fn.impl.MappifyUtility.createMap(inHolder.reader, writer, "any_value"); | ||
| } | ||
| <#elseif type.runningType?starts_with("RepeatedMap")> | ||
| if (nonNullCount.value == 0) { | ||
| org.apache.drill.exec.expr.fn.impl.MappifyUtility.createRepeatedMapOrList(inHolder.reader, writer, "any_value"); | ||
| } | ||
| <#elseif type.runningType?starts_with("List")> | ||
| if (nonNullCount.value == 0) { | ||
| org.apache.drill.exec.expr.fn.impl.MappifyUtility.createList(inHolder.reader, writer, "any_value"); | ||
| } | ||
| <#elseif type.runningType?starts_with("RepeatedList")> | ||
| if (nonNullCount.value == 0) { | ||
| org.apache.drill.exec.expr.fn.impl.MappifyUtility.createRepeatedMapOrList(inHolder.reader, writer, "any_value"); | ||
| } | ||
| <#elseif type.runningType?starts_with("Repeated")> | ||
| if (nonNullCount.value == 0) { | ||
| org.apache.drill.exec.expr.fn.impl.MappifyUtility.createList(inHolder.reader, writer, "any_value"); | ||
| } | ||
| </#if> | ||
| </#if> | ||
| nonNullCount.value = 1; | ||
| <#if type.inputType?starts_with("Nullable")> | ||
| } // end of sout block | ||
| </#if> | ||
| } | ||
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| @Override | ||
| public void output() { | ||
| //Do nothing since the complex writer takes care of everything! | ||
| } | ||
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| @Override | ||
| public void reset() { | ||
| <#if aggrtype.funcName == "any_value"> | ||
| nonNullCount.value = 0; | ||
| </#if> | ||
| } | ||
| } | ||
| </#if> | ||
| </#list> | ||
| } | ||
| </#list> |
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