com.hazelcast.org.apache.calcite.schema.ColumnStrategy Maven / Gradle / Ivy
/*
* 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 com.hazelcast.org.apache.calcite.schema;
import com.hazelcast.org.apache.calcite.plan.RelOptTable;
/** Describes how a column gets populated.
*
* @see com.hazelcast.org.apache.calcite.sql2rel.InitializerExpressionFactory#generationStrategy
* @see RelOptTable#getColumnStrategies()
*/
public enum ColumnStrategy {
/** Column does not have a default value, but does allow null values.
* If you don't specify it in an INSERT, it will get a NULL value. */
NULLABLE,
/** Column does not have a default value, and does not allow nulls.
* You must specify it in an INSERT. */
NOT_NULLABLE,
/** Column has a default value.
* If you don't specify it in an INSERT, it will get a NULL value. */
DEFAULT,
/** Column is computed and stored. You cannot insert into it. */
STORED,
/** Column is computed and not stored. You cannot insert into it. */
VIRTUAL;
/**
* Returns whether you can insert into the column.
*
* @return true if this column can be inserted
*/
public boolean canInsertInto() {
return this != STORED && this != VIRTUAL;
}
}