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.adapter.enumerable;
  
  import org.apache.calcite.plan.Convention;
  import org.apache.calcite.plan.RelTraitSet;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.convert.ConverterRule;
  import org.apache.calcite.rel.core.TableModify;
  import org.apache.calcite.rel.logical.LogicalTableModify;
  import org.apache.calcite.schema.ModifiableTable;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /** Planner rule that converts a {@link LogicalTableModify} to an {@link EnumerableTableModify}.
   * You may provide a custom config to convert other nodes that extend {@link TableModify}.
   *
   * @see EnumerableRules#ENUMERABLE_TABLE_MODIFICATION_RULE */
  public class EnumerableTableModifyRule extends ConverterRule {
    /** Default configuration. */
    public static final Config DEFAULT_CONFIG = Config.INSTANCE
        .withConversion(LogicalTableModify.class, Convention.NONE,
            EnumerableConvention.INSTANCE, "EnumerableTableModificationRule")
        .withRuleFactory(EnumerableTableModifyRule::new);
  
    /** Creates an EnumerableTableModifyRule. */
    protected EnumerableTableModifyRule(Config config) {
      super(config);
    }
  
    @Override public @Nullable RelNode convert(RelNode rel) {
      final TableModify modify = (TableModify) rel;
      final ModifiableTable modifiableTable =
          modify.getTable().unwrap(ModifiableTable.class);
      if (modifiableTable == null) {
        return null;
      }
      final RelTraitSet traitSet =
          modify.getTraitSet().replace(EnumerableConvention.INSTANCE);
      return new EnumerableTableModify(
          modify.getCluster(), traitSet,
          modify.getTable(),
          modify.getCatalogReader(),
          convert(modify.getInput(), traitSet),
          modify.getOperation(),
          modify.getUpdateColumnList(),
          modify.getSourceExpressionList(),
          modify.isFlattened());
    }
  }
  