content: /*
   * 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.calcite.sql;
  
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.sql.type.ExplicitOperandTypeChecker;
  
  /**
   * Type Constructor function.
   *
   * <p>Created by the parser, then it is rewritten to proper SqlFunction by
   * the validator to a function defined in a Calcite schema.
   */
  public class SqlTypeConstructorFunction extends SqlFunction {
  
    private final RelDataType type;
  
    /**
     * Creates a constructor function for types.
     *
     * @param identifier possibly qualified identifier for function
     * @param type type of data
     */
    public SqlTypeConstructorFunction(SqlIdentifier identifier,
        RelDataType type) {
      super(identifier,
          null,
          null,
          new ExplicitOperandTypeChecker(type),
          null,
          SqlFunctionCategory.SYSTEM);
      this.type = type;
    }
  
    @Override public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
      return type;
    }
  }
  