| /* |
| * 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. |
| */ |
| package org.apache.drill.common.logical.data; |
| |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.drill.common.expression.FieldReference; |
| import org.apache.drill.common.expression.LogicalExpression; |
| import org.apache.drill.common.logical.data.visitors.LogicalVisitor; |
| |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| import com.fasterxml.jackson.annotation.JsonTypeName; |
| import com.google.common.collect.Iterators; |
| import com.google.common.collect.Lists; |
| |
| @JsonTypeName("groupingaggregate") |
| public class GroupingAggregate extends SingleInputOperator{ |
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(GroupingAggregate.class); |
| |
| private final List<NamedExpression> keys; |
| private final List<NamedExpression> exprs; |
| |
| public GroupingAggregate(@JsonProperty("keys") List<NamedExpression> keys, @JsonProperty("exprs") List<NamedExpression> exprs) { |
| super(); |
| this.keys = keys; |
| this.exprs = exprs; |
| } |
| |
| @Override |
| public <T, X, E extends Throwable> T accept(LogicalVisitor<T, X, E> logicalVisitor, X value) throws E { |
| return logicalVisitor.visitGroupingAggregate(this, value); |
| } |
| |
| @Override |
| public Iterator<LogicalOperator> iterator() { |
| return Iterators.singletonIterator(getInput()); |
| } |
| |
| public static Builder builder(){ |
| return new Builder(); |
| } |
| |
| public List<NamedExpression> getKeys(){ |
| return keys; |
| } |
| |
| public List<NamedExpression> getExprs(){ |
| return exprs; |
| } |
| |
| public static class Builder extends AbstractSingleBuilder<GroupingAggregate, Builder>{ |
| private List<NamedExpression> keys = Lists.newArrayList(); |
| private List<NamedExpression> exprs = Lists.newArrayList(); |
| |
| public Builder addKey(FieldReference ref, LogicalExpression expr){ |
| keys.add(new NamedExpression(expr, ref)); |
| return this; |
| } |
| |
| public Builder addKey(NamedExpression expr){ |
| keys.add(expr); |
| return this; |
| } |
| |
| public Builder addExpr(NamedExpression expr){ |
| exprs.add(expr); |
| return this; |
| } |
| |
| public Builder addExpr(FieldReference ref, LogicalExpression expr){ |
| exprs.add(new NamedExpression(expr, ref)); |
| return this; |
| } |
| |
| @Override |
| public GroupingAggregate internalBuild(){ |
| GroupingAggregate ga = new GroupingAggregate(keys, exprs); |
| return ga; |
| } |
| |
| } |
| |
| |
| |
| } |