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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.store.direct;
import com.fasterxml.jackson.annotation.JsonTypeName;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.physical.base.GroupScan;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.base.ScanStats;
import org.apache.drill.exec.store.RecordReader;
import org.apache.hadoop.fs.Path;
import java.util.Collection;
import java.util.List;
/**
* Represents direct scan based on metadata information.
* For example, for parquet files it can be obtained from parquet footer (total row count)
* or from parquet metadata files (column counts).
* Contains reader, statistics and list of scanned files if present.
*/
@JsonTypeName("metadata-direct-scan")
public class MetadataDirectGroupScan extends DirectGroupScan {
private final Collection<Path> files;
public MetadataDirectGroupScan(RecordReader reader, Collection<Path> files) {
super(reader);
this.files = files;
}
public MetadataDirectGroupScan(RecordReader reader, Collection<Path> files, ScanStats stats) {
super(reader, stats);
this.files = files;
}
@Override
public PhysicalOperator getNewWithChildren(List<PhysicalOperator> children) {
assert children == null || children.isEmpty();
return new MetadataDirectGroupScan(reader, files, stats);
}
@Override
public GroupScan clone(List<SchemaPath> columns) {
return this;
}
/**
* <p>
* Returns string representation of group scan data.
* Includes list of files if present.
* </p>
*
* <p>
* Example: [files = [/tmp/0_0_0.parquet], numFiles = 1]
* </p>
*
* @return string representation of group scan data
*/
@Override
public String getDigest() {
if (files != null) {
StringBuilder builder = new StringBuilder();
builder.append("files = ").append(files).append(", ");
builder.append("numFiles = ").append(files.size()).append(", ");
return builder.append(super.getDigest()).toString();
}
return super.getDigest();
}
}
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