/*
* 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.vector.accessor;
/**
* Common base interface for columns readers and writers. Provides
* the access type for the column. Note that multiple Drill types and
* data modes map to the same access type.
*/
public interface ColumnAccessor {
public enum ValueType {
INTEGER, LONG, DOUBLE, STRING, BYTES, DECIMAL, PERIOD, ARRAY, MAP
}
/**
* Describe the type of the value. This is a compression of the
* value vector type: it describes which method will return the
* vector value.
* @return the value type which indicates which get method
* is valid for the column
*/
ColumnAccessor.ValueType valueType();
}