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   * Licensed to the Apache Software Foundation (ASF) under one
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   * distributed with this work for additional information
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   * 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
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  package org.apache.beam.sdk.extensions.sql;
  
  import static org.junit.Assert.assertEquals;
  
  import org.apache.beam.sdk.extensions.sql.meta.provider.text.TextTableProvider;
  import org.apache.beam.sdk.extensions.sql.meta.store.InMemoryMetaStore;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.parser.SqlParseException;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.tools.RelConversionException;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.tools.ValidationException;
  import org.junit.Before;
  import org.junit.Ignore;
  
  /** UnitTest for Explain Plan. */
  public class BeamSqlExplainTest {
    private InMemoryMetaStore metaStore;
    private BeamSqlCli cli;
  
    @Before
    public void setUp() throws SqlParseException, RelConversionException, ValidationException {
      metaStore = new InMemoryMetaStore();
      metaStore.registerProvider(new TextTableProvider());
      cli = new BeamSqlCli().metaStore(metaStore);
  
      cli.execute(
          "CREATE EXTERNAL TABLE person (\n"
              + "id int COMMENT 'id', \n"
              + "name varchar COMMENT 'name', \n"
              + "age int COMMENT 'age') \n"
              + "TYPE 'text' \n"
              + "COMMENT '' ");
  
      cli.execute(
          "CREATE EXTERNAL TABLE A (\n"
              + "c1 int COMMENT 'c1',\n"
              + "c2 int COMMENT 'c2')\n"
              + "TYPE 'text'\n"
              + "COMMENT '' ");
  
      cli.execute(
          "CREATE EXTERNAL TABLE B (\n"
              + "c1 int COMMENT 'c1',\n"
              + "c2 int COMMENT 'c2')\n"
              + "TYPE 'text'\n"
              + "COMMENT '' ");
    }
  
    // TODO: (https://github.com/apache/beam/issues/19059) 5/30/2017 The test here is too fragile.
    @Ignore
    public void testExplainCommaJoin() {
      String plan = cli.explainQuery("SELECT A.c1, B.c2 FROM A, B WHERE A.c1 = B.c2 AND A.c1 > 0");
  
      assertEquals(
          "BeamCalcRel(expr#0..3=[{inputs}], c1=[$t0], c2=[$t3])\n"
              + "  BeamCoGBKJoinRel(condition=[=($0, $3)], joinType=[inner])\n"
              + "    BeamCalcRel(expr#0..1=[{inputs}], expr#2=[0], expr#3=[>($t0, $t2)],"
              + " proj#0..1=[{exprs}], $condition=[$t3])\n"
              + "      BeamIOSourceRel(table=[[beam, A]])\n"
              + "    BeamIOSourceRel(table=[[beam, B]])\n",
          plan);
    }
  }
  