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.rel.mutable;
  
  import org.apache.calcite.plan.RelOptCluster;
  import org.apache.calcite.rel.metadata.RelColumnMapping;
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.rex.RexNode;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.lang.reflect.Type;
  import java.util.List;
  import java.util.Objects;
  import java.util.Set;
  
  /** Mutable equivalent of
   * {@link org.apache.calcite.rel.core.TableFunctionScan}. */
  public class MutableTableFunctionScan extends MutableMultiRel {
    public final RexNode rexCall;
    public final @Nullable Type elementType;
    public final @Nullable Set<RelColumnMapping> columnMappings;
  
    private MutableTableFunctionScan(RelOptCluster cluster,
        RelDataType rowType, List<MutableRel> inputs, RexNode rexCall,
        @Nullable Type elementType, @Nullable Set<RelColumnMapping> columnMappings) {
      super(cluster, rowType, MutableRelType.TABLE_FUNCTION_SCAN, inputs);
      this.rexCall = rexCall;
      this.elementType = elementType;
      this.columnMappings = columnMappings;
    }
  
    /**
     * Creates a MutableTableFunctionScan.
     *
     * @param cluster         Cluster that this relational expression belongs to
     * @param rowType         Row type
     * @param inputs          Input relational expressions
     * @param rexCall         Function invocation expression
     * @param elementType     Element type of the collection that will implement
     *                        this table
     * @param columnMappings  Column mappings associated with this function
     */
    public static MutableTableFunctionScan of(RelOptCluster cluster,
        RelDataType rowType, List<MutableRel> inputs, RexNode rexCall,
        @Nullable Type elementType, @Nullable Set<RelColumnMapping> columnMappings) {
      return new MutableTableFunctionScan(
          cluster, rowType, inputs, rexCall, elementType, columnMappings);
    }
  
    @Override public boolean equals(@Nullable Object obj) {
      return obj == this
          || obj instanceof MutableTableFunctionScan
          && STRING_EQUIVALENCE.equivalent(rexCall,
              ((MutableTableFunctionScan) obj).rexCall)
          && Objects.equals(elementType,
              ((MutableTableFunctionScan) obj).elementType)
          && Objects.equals(columnMappings,
              ((MutableTableFunctionScan) obj).columnMappings)
          && inputs.equals(((MutableTableFunctionScan) obj).getInputs());
    }
  
    @Override public int hashCode() {
      return Objects.hash(inputs,
          STRING_EQUIVALENCE.hash(rexCall), elementType, columnMappings);
    }
  
    @Override public StringBuilder digest(StringBuilder buf) {
      buf.append("TableFunctionScan(rexCall: ").append(rexCall);
      if (elementType != null) {
        buf.append(", elementType: ").append(elementType);
      }
      return buf.append(")");
    }
  
    @Override public MutableRel clone() {
      // TODO Auto-generated method stub
      return MutableTableFunctionScan.of(cluster, rowType,
          cloneChildren(), rexCall, elementType, columnMappings);
    }
  
  }
  