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.SqlNode;
  import org.apache.calcite.sql.SqlSelect;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * The name-resolution scope of a LATERAL TABLE clause.
   *
   * <p>The objects visible are those in the parameters found on the left side of
   * the LATERAL TABLE clause, and objects inherited from the parent scope.
   */
  class TableScope extends ListScope {
    //~ Instance fields --------------------------------------------------------
  
    private final SqlNode node;
  
    //~ Constructors -----------------------------------------------------------
  
    /**
     * Creates a scope corresponding to a LATERAL TABLE clause.
     *
     * @param parent  Parent scope
     */
    TableScope(SqlValidatorScope parent, SqlNode node) {
      super(parent);
      this.node = requireNonNull(node, "node");
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public SqlNode getNode() {
      return node;
    }
  
    @Override public boolean isWithin(SqlValidatorScope scope2) {
      if (this == scope2) {
        return true;
      }
      SqlValidatorScope s = getValidator().getSelectScope((SqlSelect) node);
      return s.isWithin(scope2);
    }
  }
  