org.apache.beam.sdk.extensions.sql.impl.rel.BeamValuesRel.java Source code

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Here is the source code for org.apache.beam.sdk.extensions.sql.impl.rel.BeamValuesRel.java

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/*
 * 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 com.google.common.collect.ImmutableList;
import java.util.ArrayList;
import java.util.List;
import org.apache.beam.sdk.extensions.sql.BeamRecordSqlType;
import org.apache.beam.sdk.extensions.sql.impl.BeamSqlEnv;
import org.apache.beam.sdk.extensions.sql.impl.schema.BeamTableUtils;
import org.apache.beam.sdk.extensions.sql.impl.utils.CalciteUtils;
import org.apache.beam.sdk.transforms.Create;
import org.apache.beam.sdk.values.BeamRecord;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.PCollectionTuple;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.core.Values;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rex.RexLiteral;

/**
 * {@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>
 *   <li>{@code select 1, '1', LOCALTIME}</li>
 * </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 PCollection<BeamRecord> buildBeamPipeline(PCollectionTuple inputPCollections, BeamSqlEnv sqlEnv)
            throws Exception {
        List<BeamRecord> rows = new ArrayList<>(tuples.size());
        String stageName = BeamSqlRelUtils.getStageName(this);
        if (tuples.isEmpty()) {
            throw new IllegalStateException("Values with empty tuples!");
        }

        BeamRecordSqlType beamSQLRowType = CalciteUtils.toBeamRowType(this.getRowType());
        for (ImmutableList<RexLiteral> tuple : tuples) {
            List<Object> fieldsValue = new ArrayList<>(beamSQLRowType.getFieldCount());
            for (int i = 0; i < tuple.size(); i++) {
                fieldsValue.add(BeamTableUtils.autoCastField(beamSQLRowType.getFieldTypeByIndex(i),
                        tuple.get(i).getValue()));
            }
            rows.add(new BeamRecord(beamSQLRowType, fieldsValue));
        }

        return inputPCollections.getPipeline().apply(stageName, Create.of(rows))
                .setCoder(beamSQLRowType.getRecordCoder());
    }
}