| /* |
| * 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.base; |
| |
| import com.fasterxml.jackson.annotation.JsonCreator; |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| import com.fasterxml.jackson.annotation.JsonTypeName; |
| import org.apache.drill.common.expression.SchemaPath; |
| import org.apache.drill.exec.proto.CoordinationProtos; |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| import org.apache.hadoop.fs.Path; |
| |
| import java.util.List; |
| |
| /** |
| * The type of scan operator, which allows to scan schemaless tables ({@link org.apache.drill.exec.planner.logical.DynamicDrillTable} with null selection) |
| */ |
| @JsonTypeName("schemaless-scan") |
| public class SchemalessScan extends AbstractFileGroupScan implements SubScan { |
| |
| private final Path selectionRoot; |
| |
| @JsonCreator |
| public SchemalessScan(@JsonProperty("userName") String userName, |
| @JsonProperty("selectionRoot") Path selectionRoot, |
| @JsonProperty("columns") List<SchemaPath> columns) { |
| this(userName, selectionRoot); |
| } |
| |
| public SchemalessScan(@JsonProperty("userName") String userName, |
| @JsonProperty("selectionRoot") Path selectionRoot) { |
| super(userName); |
| this.selectionRoot = selectionRoot; |
| } |
| |
| public SchemalessScan(final SchemalessScan that) { |
| super(that); |
| this.selectionRoot = that.selectionRoot; |
| } |
| |
| @JsonProperty |
| public Path getSelectionRoot() { |
| return selectionRoot; |
| } |
| |
| @Override |
| public void applyAssignments(List<CoordinationProtos.DrillbitEndpoint> endpoints) { |
| } |
| |
| @Override |
| public SubScan getSpecificScan(int minorFragmentId) { |
| return this; |
| } |
| |
| @Override |
| public int getMaxParallelizationWidth() { |
| return 1; |
| } |
| |
| @Override |
| public String getDigest() { |
| return toString(); |
| } |
| |
| @Override |
| public String toString() { |
| String pattern = "SchemalessScan [selectionRoot = %s]"; |
| return String.format(pattern, selectionRoot); |
| } |
| |
| @Override |
| public PhysicalOperator getNewWithChildren(List<PhysicalOperator> children) { |
| Preconditions.checkArgument(children.isEmpty()); |
| return new SchemalessScan(this); |
| } |
| |
| @Override |
| public GroupScan clone(List<SchemaPath> columns) { |
| return this; |
| } |
| |
| @Override |
| public ScanStats getScanStats() { |
| return ScanStats.ZERO_RECORD_TABLE; |
| } |
| |
| |
| @Override |
| public boolean canPushdownProjects(List<SchemaPath> columns) { |
| return false; |
| } |
| |
| @Override |
| public boolean supportsPartitionFilterPushdown() { |
| return false; |
| } |
| |
| } |