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.rel.type.RelDataType;
  import org.apache.calcite.sql.SqlNode;
  import org.apache.calcite.sql.SqlWith;
  import org.apache.calcite.sql.SqlWithItem;
  import org.apache.calcite.util.Util;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Namespace for <code>WITH</code> clause.
   */
  public class WithNamespace extends AbstractNamespace {
    //~ Instance fields --------------------------------------------------------
  
    private final SqlWith with;
  
    //~ Constructors -----------------------------------------------------------
  
    /**
     * Creates a TableConstructorNamespace.
     *
     * @param validator     Validator
     * @param with          WITH clause
     * @param enclosingNode Enclosing node
     */
    WithNamespace(SqlValidatorImpl validator,
        SqlWith with,
        SqlNode enclosingNode) {
      super(validator, enclosingNode);
      this.with = with;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override protected RelDataType validateImpl(RelDataType targetRowType) {
      for (SqlNode withItem : with.withList) {
        validator.validateWithItem((SqlWithItem) withItem);
      }
      final SqlValidatorScope scope2 =
          validator.getWithScope(Util.last(with.withList));
      final SqlValidatorNamespace bodyNamespace =
          requireNonNull(validator.getNamespace(with.body), "namespace");
  
      validator.validateQuery(with.body, scope2, targetRowType);
      final RelDataType rowType = validator.getValidatedNodeType(with.body);
      validator.setValidatedNodeType(with, rowType);
      filterRequirement = bodyNamespace.getFilterRequirement();
      return rowType;
    }
  
    @Override public @Nullable SqlNode getNode() {
      return with;
    }
  }
  