com.hazelcast.org.apache.calcite.sql.type.SqlTypeTransform 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.sql.type;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.sql.SqlOperatorBinding;
/**
* Strategy to transform one type to another. The transformation is dependent on
* the implemented strategy object and in the general case is a function of the
* type and the other operands. Can not be used by itself. Must be used in an
* object of type {@link SqlTypeTransformCascade}.
*
* This class is an example of the
* {@link com.hazelcast.org.apache.calcite.util.Glossary#STRATEGY_PATTERN strategy pattern}.
*
* @see SqlTypeTransforms
*/
public interface SqlTypeTransform {
//~ Methods ----------------------------------------------------------------
/**
* Transforms a type.
*
* @param opBinding call context in which transformation is being
* performed
* @param typeToTransform type to be transformed, never null
* @return transformed type, never null
*/
RelDataType transformType(
SqlOperatorBinding opBinding,
RelDataType typeToTransform);
}