/**
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.ambari.view.hive20.internal.parsers;
import org.apache.ambari.view.hive20.client.Row;
import org.apache.ambari.view.hive20.internal.dto.ColumnInfo;
import org.apache.ambari.view.hive20.internal.dto.PartitionInfo;
import org.apache.parquet.Strings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
*
*/
public class PartitionInfoParser extends AbstractTableMetaParser<PartitionInfo> {
private static final Logger LOG = LoggerFactory.getLogger(PartitionInfoParser.class);
/*
General format
| # Partition Information | NULL | NULL |
| # col_name | data_type | comment |
| | NULL | NULL |
| dt | string | |
| country | string | |
| | NULL | NULL |
*/
public PartitionInfoParser() {
super("# Partition Information", "# col_name", "", "");
}
@Override
public PartitionInfo parse(List<Row> rows) {
List<ColumnInfo> columns = new ArrayList<>();
Map<String, Object> parsedSection = parseSection(rows);
for(Object obj: parsedSection.values()) {
if(obj instanceof Entry) {
Entry entry = (Entry)obj;
String typeInfo = entry.getValue();
// parse precision and scale
List<String> typePrecisionScale = ParserUtils.parseColumnDataType(typeInfo);
String datatype = typePrecisionScale.get(0);
String precisionString = typePrecisionScale.get(1);
String scaleString = typePrecisionScale.get(2);
Integer precision = !Strings.isNullOrEmpty(precisionString) ? Integer.valueOf(precisionString.trim()): null;
Integer scale = !Strings.isNullOrEmpty(scaleString) ? Integer.valueOf(scaleString.trim()): null;
ColumnInfo columnInfo = new ColumnInfo(entry.getName(), datatype, precision, scale, entry.getComment());
columns.add(columnInfo);
LOG.debug("found partition column definition : {}", columnInfo);
}
}
return columns.size() > 0? new PartitionInfo(columns) : null;
}
}