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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;
  
  import java.util.Collection;
  import java.util.List;
  import java.util.Map;
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamEnumerableConverter;
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamIOSinkRel;
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamIOSourceRel;
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamLogicalConvention;
  import org.apache.beam.sdk.extensions.sql.impl.utils.CalciteUtils;
  import org.apache.beam.sdk.extensions.sql.meta.BeamSqlTable;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.adapter.java.AbstractQueryableTable;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.linq4j.QueryProvider;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.linq4j.Queryable;
  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.RelOptTable;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.prepare.Prepare;
  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.core.TableModify;
  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.rel.type.RelDataTypeFactory;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rex.RexNode;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.schema.ModifiableTable;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.schema.SchemaPlus;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.schema.TranslatableTable;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  
  /** Adapter from {@link BeamSqlTable} to a calcite Table. */
  @SuppressWarnings({
    "rawtypes", // TODO(https://github.com/apache/beam/issues/20447)
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class BeamCalciteTable extends AbstractQueryableTable
      implements ModifiableTable, TranslatableTable {
    private final BeamSqlTable beamTable;
    // These two options should be unified.
    // https://issues.apache.org/jira/projects/BEAM/issues/BEAM-7590
    private final Map<String, String> pipelineOptionsMap;
    private PipelineOptions pipelineOptions;
  
    BeamCalciteTable(
        BeamSqlTable beamTable,
        Map<String, String> pipelineOptionsMap,
        PipelineOptions pipelineOptions) {
      super(Object[].class);
      this.beamTable = beamTable;
      this.pipelineOptionsMap = pipelineOptionsMap;
      this.pipelineOptions = pipelineOptions;
    }
  
    public static BeamCalciteTable of(BeamSqlTable table) {
      return new BeamCalciteTable(table, ImmutableMap.of(), null);
    }
  
    @Override
    public RelDataType getRowType(RelDataTypeFactory typeFactory) {
      return CalciteUtils.toCalciteRowType(this.beamTable.getSchema(), typeFactory);
    }
  
    private PipelineOptions getPipelineOptions() {
      if (pipelineOptions != null) {
        return pipelineOptions;
      }
  
      pipelineOptions = BeamEnumerableConverter.createPipelineOptions(pipelineOptionsMap);
      return pipelineOptions;
    }
  
    @Override
    public BeamTableStatistics getStatistic() {
      /*
       Changing class loader is required for the JDBC path. It is similar to what done in
       {@link BeamEnumerableConverter#toRowList} and {@link BeamEnumerableConverter#toEnumerable }.
      */
      final ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
      try {
        Thread.currentThread().setContextClassLoader(BeamEnumerableConverter.class.getClassLoader());
        return beamTable.getTableStatistics(getPipelineOptions());
      } finally {
        Thread.currentThread().setContextClassLoader(originalClassLoader);
      }
    }
  
    @Override
    public RelNode toRel(RelOptTable.ToRelContext context, RelOptTable relOptTable) {
      return new BeamIOSourceRel(
          context.getCluster(),
          context.getCluster().traitSetOf(BeamLogicalConvention.INSTANCE),
          relOptTable,
          beamTable,
          pipelineOptionsMap,
          this);
    }
  
    @Override
    public <T> Queryable<T> asQueryable(
        QueryProvider queryProvider, SchemaPlus schema, String tableName) {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public Collection getModifiableCollection() {
      return null;
    }
  
    @Override
    public TableModify toModificationRel(
        RelOptCluster cluster,
        RelOptTable table,
        Prepare.CatalogReader catalogReader,
        RelNode child,
        TableModify.Operation operation,
        List<String> updateColumnList,
        List<RexNode> sourceExpressionList,
        boolean flattened) {
      return new BeamIOSinkRel(
          cluster,
          table,
          catalogReader,
          child,
          operation,
          updateColumnList,
          sourceExpressionList,
          flattened,
          beamTable,
          pipelineOptionsMap);
    }
  }
  