| /* |
| * 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.exec.physical.impl.statistics; |
| |
| import org.apache.drill.common.types.TypeProtos; |
| import org.apache.drill.exec.vector.ValueVector; |
| import org.apache.drill.exec.vector.VarCharVector; |
| import org.apache.drill.exec.vector.complex.MapVector; |
| import org.apache.drill.metastore.statistics.Statistic; |
| |
| import java.nio.charset.StandardCharsets; |
| |
| public class ColumnMergedStatistic extends AbstractMergedStatistic { |
| |
| public ColumnMergedStatistic () { |
| state = State.INIT; |
| } |
| |
| @Override |
| public void initialize(String inputName, double samplePercent) { |
| super.initialize(Statistic.COLNAME, inputName, samplePercent); |
| state = State.MERGE; |
| } |
| |
| @Override |
| public String getName() { |
| return name; |
| } |
| |
| @Override |
| public String getInput() { |
| return inputName; |
| } |
| |
| @Override |
| public void merge(MapVector input) { |
| // Check the input is a Map Vector |
| assert (input.getField().getType().getMinorType() == TypeProtos.MinorType.MAP); |
| } |
| |
| @Override |
| public void setOutput(MapVector output) { |
| // Check the input is a Map Vector |
| assert (output.getField().getType().getMinorType() == TypeProtos.MinorType.MAP); |
| MapVector outputMap = (MapVector) output; |
| for (ValueVector outMapCol : outputMap) { |
| String colName = outMapCol.getField().getName(); |
| VarCharVector vv = (VarCharVector) outMapCol; |
| vv.allocateNewSafe(); |
| // Set column name in ValueVector |
| vv.getMutator().setSafe(0, colName.getBytes(StandardCharsets.UTF_8), 0, colName.length()); |
| } |
| // Now moving to COMPLETE state |
| state = State.COMPLETE; |
| } |
| } |