content: /*
   * 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.calcite.plan;
  
  import org.apache.calcite.linq4j.tree.Expression;
  import org.apache.calcite.prepare.RelOptTableImpl;
  import org.apache.calcite.rel.RelCollation;
  import org.apache.calcite.rel.RelDistribution;
  import org.apache.calcite.rel.RelDistributions;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.RelReferentialConstraint;
  import org.apache.calcite.rel.logical.LogicalTableScan;
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.rel.type.RelDataTypeField;
  import org.apache.calcite.schema.ColumnStrategy;
  import org.apache.calcite.util.ImmutableBitSet;
  
  import com.google.common.collect.ImmutableList;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Partial implementation of {@link RelOptTable}.
   */
  public abstract class RelOptAbstractTable implements RelOptTable {
    //~ Instance fields --------------------------------------------------------
  
    protected final RelOptSchema schema;
    protected final RelDataType rowType;
    protected final String name;
  
    //~ Constructors -----------------------------------------------------------
  
    protected RelOptAbstractTable(
        RelOptSchema schema,
        String name,
        RelDataType rowType) {
      this.schema = schema;
      this.name = name;
      this.rowType = rowType;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    public String getName() {
      return name;
    }
  
    @Override public List<String> getQualifiedName() {
      return ImmutableList.of(name);
    }
  
    @Override public double getRowCount() {
      return 100;
    }
  
    @Override public RelDataType getRowType() {
      return rowType;
    }
  
    @Override public RelOptSchema getRelOptSchema() {
      return schema;
    }
  
    // Override to define collations.
    @Override public @Nullable List<RelCollation> getCollationList() {
      return Collections.emptyList();
    }
  
    @Override public @Nullable RelDistribution getDistribution() {
      return RelDistributions.BROADCAST_DISTRIBUTED;
    }
  
    @Override public <T extends Object> @Nullable T unwrap(Class<T> clazz) {
      return clazz.isInstance(this)
          ? clazz.cast(this)
          : null;
    }
  
    // Override to define keys
    @Override public boolean isKey(ImmutableBitSet columns) {
      return false;
    }
  
    // Override to get unique keys
    @Override public @Nullable List<ImmutableBitSet> getKeys() {
      return Collections.emptyList();
    }
  
    // Override to define foreign keys
    @Override public @Nullable List<RelReferentialConstraint> getReferentialConstraints() {
      return Collections.emptyList();
    }
  
    @Override public RelNode toRel(ToRelContext context) {
      return LogicalTableScan.create(context.getCluster(), this,
          context.getTableHints());
    }
  
    @Override public @Nullable Expression getExpression(Class clazz) {
      return null;
    }
  
    @Override public RelOptTable extend(List<RelDataTypeField> extendedFields) {
      throw new UnsupportedOperationException();
    }
  
    @Override public List<ColumnStrategy> getColumnStrategies() {
      return RelOptTableImpl.columnStrategies(this);
    }
  
  }
  