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.interpreter;
  
  import org.apache.calcite.rel.core.Values;
  import org.apache.calcite.rex.RexLiteral;
  import org.apache.calcite.rex.RexNode;
  
  import com.google.common.collect.ImmutableList;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Interpreter node that implements a
   * {@link org.apache.calcite.rel.core.Values}.
   */
  public class ValuesNode implements Node {
    private final Sink sink;
    private final int fieldCount;
    private final ImmutableList<Row> rows;
  
    public ValuesNode(Compiler compiler, Values rel) {
      this.sink = compiler.sink(rel);
      this.fieldCount = rel.getRowType().getFieldCount();
      this.rows = createRows(compiler, fieldCount, rel.getTuples());
    }
  
    private static ImmutableList<Row> createRows(Compiler compiler,
        int fieldCount,
        ImmutableList<ImmutableList<RexLiteral>> tuples) {
      final List<RexNode> nodes = new ArrayList<>();
      for (ImmutableList<RexLiteral> tuple : tuples) {
        nodes.addAll(tuple);
      }
      final Scalar scalar = compiler.compile(nodes, null);
      final Object[] values = new Object[nodes.size()];
      final Context context = compiler.createContext();
      scalar.execute(context, values);
      final ImmutableList.Builder<Row> rows = ImmutableList.builder();
      Object[] subValues = new Object[fieldCount];
      for (int r = 0, n = tuples.size(); r < n; ++r) {
        System.arraycopy(values, r * fieldCount, subValues, 0, fieldCount);
        rows.add(Row.asCopy(subValues));
      }
      return rows.build();
    }
  
    @Override public void run() throws InterruptedException {
      for (Row row : rows) {
        sink.send(row);
      }
      sink.end();
    }
  }
  