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.SqlCall;
  import org.apache.calcite.sql.SqlNode;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import static org.apache.calcite.util.Static.RESOURCE;
  
  /**
   * Namespace for a table constructor <code>VALUES (expr, expr, ...)</code>.
   */
  public class TableConstructorNamespace extends AbstractNamespace {
    //~ Instance fields --------------------------------------------------------
  
    private final SqlCall values;
    private final SqlValidatorScope scope;
  
    //~ Constructors -----------------------------------------------------------
  
    /**
     * Creates a TableConstructorNamespace.
     *
     * @param validator     Validator
     * @param values        VALUES parse tree node
     * @param scope         Scope
     * @param enclosingNode Enclosing node
     */
    TableConstructorNamespace(
        SqlValidatorImpl validator,
        SqlCall values,
        SqlValidatorScope scope,
        SqlNode enclosingNode) {
      super(validator, enclosingNode);
      this.values = values;
      this.scope = scope;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override protected RelDataType validateImpl(RelDataType targetRowType) {
      // First, validate the VALUES. If VALUES is inside INSERT, infers
      // the type of NULL values based on the types of target columns.
      validator.validateValues(values, targetRowType, scope);
      final RelDataType tableConstructorRowType =
          validator.getTableConstructorRowType(values, scope);
      if (tableConstructorRowType == null) {
        throw validator.newValidationError(values, RESOURCE.incompatibleTypes());
      }
      return tableConstructorRowType;
    }
  
    @Override public @Nullable SqlNode getNode() {
      return values;
    }
  
    /**
     * Returns the scope.
     *
     * @return scope
     */
    public SqlValidatorScope getScope() {
      return scope;
    }
  
    @Override public boolean supportsModality(SqlModality modality) {
      return modality == SqlModality.RELATION;
    }
  }
  