TableConstructorNamespace.java

/*
 * 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;
  }
}