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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.planner;
  
  import org.apache.beam.sdk.extensions.sql.impl.rel.BaseRelTest;
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamSqlRelUtils;
  import org.apache.beam.sdk.extensions.sql.meta.provider.test.TestBoundedTable;
  import org.apache.beam.sdk.schemas.Schema;
  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.RelTraitSet;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.plan.volcano.RelSubset;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.RelNode;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.SingleRel;
  import org.junit.Assert;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  /** This tests the NodeStats Metadata handler and the estimations. */
  public class NodeStatsTest extends BaseRelTest {
    static class UnknownRel extends SingleRel {
      protected UnknownRel(RelOptCluster cluster, RelTraitSet traits, RelNode input) {
        super(cluster, traits, input);
      }
    }
  
    public static final TestBoundedTable ORDER_DETAILS1 =
        TestBoundedTable.of(
                Schema.FieldType.INT32, "order_id",
                Schema.FieldType.INT32, "site_id",
                Schema.FieldType.INT32, "price")
            .addRows(1, 2, 3, 2, 3, 3, 3, 4, 5);
  
    public static final TestBoundedTable ORDER_DETAILS2 =
        TestBoundedTable.of(
                Schema.FieldType.INT32, "order_id",
                Schema.FieldType.INT32, "site_id",
                Schema.FieldType.INT32, "price")
            .addRows(1, 2, 3, 2, 3, 3, 3, 4, 5);
  
    @BeforeClass
    public static void prepare() {
      registerTable("ORDER_DETAILS1", ORDER_DETAILS1);
      registerTable("ORDER_DETAILS2", ORDER_DETAILS2);
    }
  
    @Test
    public void testUnknownRel() {
      String sql = " select * from ORDER_DETAILS1 ";
      RelNode root = env.parseQuery(sql);
      RelNode unknown = new UnknownRel(root.getCluster(), RelTraitSet.createEmpty(), null);
      NodeStats nodeStats =
          unknown
              .metadata(NodeStatsMetadata.class, unknown.getCluster().getMetadataQuery())
              .getNodeStats();
      Assert.assertTrue(nodeStats.isUnknown());
    }
  
    @Test
    public void testKnownRel() {
      String sql = " select * from ORDER_DETAILS1 ";
      RelNode root = env.parseQuery(sql);
      NodeStats nodeStats =
          root.metadata(NodeStatsMetadata.class, root.getCluster().getMetadataQuery()).getNodeStats();
      Assert.assertFalse(nodeStats.isUnknown());
    }
  
    @Test
    public void testSubsetHavingBest() {
      String sql = " select * from ORDER_DETAILS1 ";
      RelNode root = env.parseQuery(sql);
      root = root.getCluster().getPlanner().getRoot();
  
      // tests if we are actually testing what we want.
      Assert.assertTrue(root instanceof RelSubset);
  
      NodeStats estimates =
          BeamSqlRelUtils.getNodeStats(
              root, ((BeamRelMetadataQuery) root.getCluster().getMetadataQuery()));
      Assert.assertFalse(estimates.isUnknown());
    }
  }
  