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.SqlSelect;
  import org.apache.calcite.sql.type.SqlTypeUtil;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Namespace offered by a sub-query.
   *
   * @see SelectScope
   * @see SetopNamespace
   */
  public class SelectNamespace extends AbstractNamespace {
    //~ Instance fields --------------------------------------------------------
  
    private final SqlSelect select;
  
    //~ Constructors -----------------------------------------------------------
  
    /**
     * Creates a SelectNamespace.
     *
     * @param validator     Validate
     * @param select        Select node
     * @param enclosingNode Enclosing node
     */
    public SelectNamespace(
        SqlValidatorImpl validator,
        SqlSelect select,
        SqlNode enclosingNode) {
      super(validator, enclosingNode);
      this.select = select;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    // implement SqlValidatorNamespace, overriding return type
    @Override public SqlSelect getNode() {
      return select;
    }
  
    @Override public RelDataType validateImpl(RelDataType targetRowType) {
      validator.validateSelect(select, targetRowType);
      return requireNonNull(rowType, "rowType");
    }
  
    @Override public boolean supportsModality(SqlModality modality) {
      return validator.validateModality(select, modality, false);
    }
  
    @Override public SqlMonotonicity getMonotonicity(String columnName) {
      final RelDataType rowType = this.getRowTypeSansSystemColumns();
      final int field = SqlTypeUtil.findField(rowType, columnName);
      SelectScope selectScope =
          requireNonNull(validator.getRawSelectScope(select),
              () -> "rawSelectScope for " + select);
      final SqlNode selectItem =
          requireNonNull(selectScope.getExpandedSelectList(),
              () -> "expandedSelectList for selectScope of " + select).get(field);
      return validator.getSelectScope(select).getMonotonicity(selectItem);
    }
  }
  