/**
* 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.drill.exec.store.parquet.stat;
import org.apache.drill.common.expression.SchemaPath;
import java.util.Map;
import java.util.Set;
public interface ColumnStatCollector {
/**
* Given a list of fields (SchemaPath), return mapping from field to its corresponding ColumnStatistics
* @return
*/
Map<SchemaPath, ColumnStatistics> collectColStat(Set<SchemaPath> fields);
}