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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,
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   * See the License for the specific language governing permissions and
   * limitations under the License.
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  package org.apache.beam.sdk.extensions.sql.impl.rel;
  
  import java.util.Arrays;
  import java.util.List;
  import org.apache.beam.sdk.extensions.sql.TestUtils;
  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.meta.provider.test.TestBoundedTable;
  import org.apache.beam.sdk.schemas.Schema;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.Row;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.RelNode;
  import org.junit.Assert;
  import org.junit.Rule;
  import org.junit.Test;
  
  /** Tests for {@code BeamUncollectRel}. */
  public class BeamUncollectRelTest extends BaseRelTest {
  
    @Rule public final TestPipeline pipeline = TestPipeline.create();
  
    private NodeStats getEstimateOf(String sql) {
      RelNode root = env.parseQuery(sql);
  
      while (!(root instanceof BeamUncollectRel)) {
        root = root.getInput(0);
      }
  
      return BeamSqlRelUtils.getNodeStats(
          root, ((BeamRelMetadataQuery) root.getCluster().getMetadataQuery()));
    }
  
    @Test
    public void testNodeStats() {
      NodeStats estimate =
          getEstimateOf(
              "SELECT * FROM UNNEST (SELECT * FROM (VALUES (ARRAY ['a', 'b', 'c']),(ARRAY ['a', 'b', 'c']))) t1");
  
      Assert.assertEquals(4d, estimate.getRowCount(), 0.001);
      Assert.assertEquals(4d, estimate.getWindow(), 0.001);
      Assert.assertEquals(0., estimate.getRate(), 0.001);
    }
  
    @Test
    public void testUncollectPrimitive() {
      String sql = "SELECT * FROM unnest(ARRAY [1, 2, 3])";
  
      PCollection<Row> rows = compilePipeline(sql, pipeline);
      PAssert.that(rows)
          .containsInAnyOrder(
              TestUtils.RowsBuilder.of(Schema.FieldType.INT32, "intField")
                  .addRows(1, 2, 3)
                  .getRows());
      pipeline.run();
    }
  
    @Test
    public void testUncollectNested() {
      Schema rowSchema =
          Schema.builder().addStringField("stringField").addInt32Field("intField").build();
      List<Row> nestedRows =
          Arrays.asList(
              Row.withSchema(rowSchema).addValues("test1", 1).build(),
              Row.withSchema(rowSchema).addValues("test2", 2).build());
      registerTable(
          "NESTED",
          TestBoundedTable.of(
                  Schema.FieldType.STRING,
                  "user_id",
                  Schema.FieldType.array(Schema.FieldType.row(rowSchema)),
                  "nested")
              .addRows("1", nestedRows));
  
      String sql = "SELECT intField, stringField FROM unnest(SELECT nested from NESTED)";
  
      PCollection<Row> rows = compilePipeline(sql, pipeline);
      PAssert.that(rows)
          .containsInAnyOrder(
              TestUtils.RowsBuilder.of(
                      Schema.FieldType.INT32, "intField",
                      Schema.FieldType.STRING, "stringField")
                  .addRows(1, "test1", 2, "test2")
                  .getRows());
      pipeline.run();
    }
  }
  