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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.
*/
package org.apache.drill.exec.physical.base;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.apache.drill.shaded.guava.com.google.common.collect.Lists;
import org.apache.drill.common.expression.LogicalExpression;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.expr.fn.FunctionImplementationRegistry;
import org.apache.drill.exec.ops.UdfUtilities;
import org.apache.drill.exec.physical.EndpointAffinity;
import org.apache.drill.exec.planner.fragment.DistributionAffinity;
import org.apache.drill.exec.planner.physical.PlannerSettings;
import com.fasterxml.jackson.annotation.JsonIgnore;
import org.apache.drill.exec.server.options.OptionManager;
import org.apache.hadoop.fs.Path;
public abstract class AbstractGroupScan extends AbstractBase implements GroupScan {
public AbstractGroupScan(String userName) {
super(userName);
}
public AbstractGroupScan(AbstractGroupScan that) {
super(that);
}
@Override
public Iterator<PhysicalOperator> iterator() {
return Collections.emptyIterator();
}
@Override
public List<EndpointAffinity> getOperatorAffinity() {
return Collections.emptyList();
}
@Override
public boolean isExecutable() {
return false;
}
@Override
public <T, X, E extends Throwable> T accept(PhysicalVisitor<T, X, E> physicalVisitor, X value) throws E{
return physicalVisitor.visitGroupScan(this, value);
}
@Override
public GroupScan clone(List<SchemaPath> columns) {
throw new UnsupportedOperationException(String.format("%s does not implement clone(columns) method!", this.getClass().getCanonicalName()));
}
@Override
@JsonIgnore
public boolean isDistributed() {
return getMaxParallelizationWidth() > 1 ? true : false;
}
@Override
@JsonIgnore
public int getMinParallelizationWidth() {
return 1;
}
@Override
public ScanStats getScanStats(PlannerSettings settings) {
return getScanStats();
}
@JsonIgnore
public ScanStats getScanStats() {
throw new UnsupportedOperationException("This should be implemented.");
}
@Override
@JsonIgnore
@Deprecated
public boolean enforceWidth() {
return getMinParallelizationWidth() > 1;
}
@Override
@JsonIgnore
public long getInitialAllocation() {
return 0;
}
@Override
@JsonIgnore
public long getMaxAllocation() {
return 0;
}
@Override
@JsonIgnore
public boolean canPushdownProjects(List<SchemaPath> columns) {
return false;
}
@Override
@JsonIgnore
public boolean supportsPartitionFilterPushdown() {
return false;
}
/**
* By default, throw exception, since group scan does not have exact column value count.
*/
@Override
public long getColumnValueCount(SchemaPath column) {
throw new UnsupportedOperationException(String.format("%s does not have exact column value count!", this.getClass().getCanonicalName()));
}
@Override
public int getOperatorType() {
throw new UnsupportedOperationException();
}
@Override
public List<SchemaPath> getColumns() {
return GroupScan.ALL_COLUMNS;
}
@Override
public List<SchemaPath> getPartitionColumns() {
return Lists.newArrayList();
}
/**
* Default is not to support limit pushdown.
*/
@Override
@JsonIgnore
public boolean supportsLimitPushdown() {
return false;
}
/**
* By default, return null to indicate row count based prune is not supported.
* Each group scan subclass should override, if it supports row count based prune.
*/
@Override
@JsonIgnore
public GroupScan applyLimit(int maxRecords) {
return null;
}
@Override
public boolean hasFiles() {
return false;
}
@Override
public Collection<Path> getFiles() {
return null;
}
@Override
public DistributionAffinity getDistributionAffinity() {
return DistributionAffinity.SOFT;
}
@Override
public LogicalExpression getFilter() {
return null;
}
@Override
public GroupScan applyFilter(LogicalExpression filterExpr, UdfUtilities udfUtilities, FunctionImplementationRegistry functionImplementationRegistry, OptionManager optionManager) {
return null;
}
}
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