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.validate;
  
  import org.apache.calcite.sql.SqlCall;
  import org.apache.calcite.sql.SqlKind;
  import org.apache.calcite.sql.SqlLiteral;
  import org.apache.calcite.sql.SqlNode;
  import org.apache.calcite.sql.SqlNodeList;
  import org.apache.calcite.sql.SqlOperator;
  import org.apache.calcite.sql.SqlSpecialOperator;
  import org.apache.calcite.sql.SqlTableRef;
  import org.apache.calcite.sql.SqlWithItem;
  import org.apache.calcite.sql.parser.SqlParserPos;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A <code>SqlWithItemTableRef</code> is a node created during validation for
   * recursive queries which represents a table reference in a {@code WITH RECURSIVE} clause.
   */
  public class SqlWithItemTableRef extends SqlTableRef {
    private final SqlWithItem withItem;
    public SqlWithItemTableRef(SqlParserPos pos,
        SqlWithItem withItem) {
      super(pos, withItem.name, SqlNodeList.EMPTY);
      this.withItem = withItem;
    }
  
    private static final SqlOperator OPERATOR =
        new SqlSpecialOperator("WITH_ITEM_TABLE_REF", SqlKind.WITH_ITEM_TABLE_REF) {
          @Override public SqlCall createCall(
              @Nullable SqlLiteral functionQualifier,
              SqlParserPos pos, @Nullable SqlNode... operands) {
            return new SqlWithItemTableRef(pos,
                (SqlWithItem) requireNonNull(operands[0], "withItem"));
          }
        };
    @Override public SqlOperator getOperator() {
      return OPERATOR;
    }
  
    public SqlWithItem getWithItem() {
      return withItem;
    }
  }
  