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.SqlPivot;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Scope for expressions in a {@code PIVOT} clause.
   */
  public class PivotScope extends ListScope {
  
    //~ Instance fields ---------------------------------------------
    private final SqlPivot pivot;
  
    /** Creates a PivotScope. */
    public PivotScope(SqlValidatorScope parent, SqlPivot pivot) {
      super(parent);
      this.pivot = pivot;
    }
  
    /** By analogy with
     * {@link org.apache.calcite.sql.validate.ListScope#getChildren()}, but this
     * scope only has one namespace, and it is anonymous. */
    public SqlValidatorNamespace getChild() {
      return requireNonNull(
          validator.getNamespace(pivot.query),
          () -> "namespace for pivot.query " + pivot.query);
    }
  
    @Override public SqlPivot getNode() {
      return pivot;
    }
  }
  