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.beam.sdk.extensions.sql.impl.rel;
  
  import static java.util.stream.Collectors.toList;
  import static org.apache.beam.sdk.extensions.sql.impl.schema.BeamTableUtils.autoCastField;
  import static org.apache.beam.sdk.values.Row.toRow;
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkArgument;
  
  import java.util.List;
  import java.util.Map;
  import java.util.stream.IntStream;
  import org.apache.beam.sdk.extensions.sql.impl.planner.BeamCostModel;
  import org.apache.beam.sdk.extensions.sql.impl.planner.BeamRelMetadataQuery;
  import org.apache.beam.sdk.extensions.sql.impl.planner.NodeStats;
  import org.apache.beam.sdk.extensions.sql.impl.utils.CalciteUtils;
  import org.apache.beam.sdk.schemas.Schema;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PCollectionList;
  import org.apache.beam.sdk.values.Row;
  import org.apache.beam.vendor.calcite.v1_40_0.com.google.common.collect.ImmutableList;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.plan.RelOptCluster;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.plan.RelOptPlanner;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.plan.RelTraitSet;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.core.Values;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.type.RelDataType;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rex.RexLiteral;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  
  /**
   * {@code BeamRelNode} to replace a {@code Values} node.
   *
   * <p>{@code BeamValuesRel} will be used in the following SQLs:
   *
   * <ul>
   *   <li>{@code insert into t (name, desc) values ('hello', 'world')}
   *   <li>{@code select 1, '1', LOCALTIME}
   * </ul>
   */
  public class BeamValuesRel extends Values implements BeamRelNode {
  
    public BeamValuesRel(
        RelOptCluster cluster,
        RelDataType rowType,
        ImmutableList<ImmutableList<RexLiteral>> tuples,
        RelTraitSet traits) {
      super(cluster, rowType, tuples, traits);
    }
  
    @Override
    public Map<String, String> getPipelineOptions() {
      return ImmutableMap.of();
    }
  
    @Override
    public PTransform<PCollectionList<Row>, PCollection<Row>> buildPTransform() {
      return new Transform();
    }
  
    private class Transform extends PTransform<PCollectionList<Row>, PCollection<Row>> {
  
      @Override
      public PCollection<Row> expand(PCollectionList<Row> pinput) {
        checkArgument(
            pinput.size() == 0,
            "Should not have received input for %s: %s",
            BeamValuesRel.class.getSimpleName(),
            pinput);
  
        Schema schema = CalciteUtils.toSchema(getRowType());
        List<Row> rows = tuples.stream().map(tuple -> tupleToRow(schema, tuple)).collect(toList());
        return pinput.getPipeline().begin().apply(Create.of(rows).withRowSchema(schema));
      }
    }
  
    private Row tupleToRow(Schema schema, ImmutableList<RexLiteral> tuple) {
      return IntStream.range(0, tuple.size())
          .mapToObj(i -> autoCastField(schema.getField(i), tuple.get(i).getValue()))
          .collect(toRow(schema));
    }
  
    @Override
    public NodeStats estimateNodeStats(BeamRelMetadataQuery mq) {
      return NodeStats.create(tuples.size(), 0, tuples.size());
    }
  
    @Override
    public BeamCostModel beamComputeSelfCost(RelOptPlanner planner, BeamRelMetadataQuery mq) {
      NodeStats estimates = BeamSqlRelUtils.getNodeStats(this, mq);
      return BeamCostModel.FACTORY.makeCost(estimates.getRowCount(), estimates.getRate());
    }
  }
  