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.jdbc;
  
  import org.apache.calcite.config.CalciteConnectionConfig;
  import org.apache.calcite.prepare.CalciteCatalogReader;
  import org.apache.calcite.sql.fun.SqlStdOperatorTable;
  import org.apache.calcite.sql.validate.SqlValidatorImpl;
  
  import com.google.common.collect.ImmutableList;
  
  /**
   * A SqlValidator with schema and type factory of the given
   * {@link org.apache.calcite.jdbc.CalcitePrepare.Context}.
   *
   * <p>This class is only used to derive data type for DDL sql node.
   * Usually we deduce query sql node data type(i.e. the {@code SqlSelect})
   * during the validation phrase. DDL nodes don't have validation,
   * they can be executed directly through
   * {@link org.apache.calcite.server.DdlExecutor}.
   *
   * <p>During the execution, {@link org.apache.calcite.sql.SqlDataTypeSpec} uses
   * this validator to derive its type.
   */
  public class ContextSqlValidator extends SqlValidatorImpl {
  
    /**
     * Create a {@code ContextSqlValidator}.
     *
     * @param context Prepare context.
     * @param mutable Whether to get the mutable schema.
     */
    public ContextSqlValidator(CalcitePrepare.Context context, boolean mutable) {
      super(SqlStdOperatorTable.instance(), getCatalogReader(context, mutable),
          context.getTypeFactory(), Config.DEFAULT);
    }
  
    private static CalciteCatalogReader getCatalogReader(
        CalcitePrepare.Context context, boolean mutable) {
      return new CalciteCatalogReader(
          mutable ? context.getMutableRootSchema() : context.getRootSchema(),
          ImmutableList.of(),
          context.getTypeFactory(),
          CalciteConnectionConfig.DEFAULT);
    }
  }
  