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.asterix.runtime.evaluators.functions.records;
  
  import java.io.IOException;
  import java.util.List;
  
  import org.apache.asterix.om.pointables.base.IVisitablePointable;
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.runtime.evaluators.functions.PointableHelper;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.data.std.primitive.VoidPointable;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  class RecordRemoveEvaluator extends AbstractRecordFunctionEvaluator {
      private final IScalarEvaluator eval0;
      private final IScalarEvaluator eval1;
      private final IPointable fieldToRemovePointable = new VoidPointable();
  
      RecordRemoveEvaluator(IScalarEvaluator eval0, IScalarEvaluator eval1, ARecordType outRecType,
              ARecordType inRecType) {
          super(outRecType, inRecType);
          this.eval0 = eval0;
          this.eval1 = eval1;
      }
  
      @Override
      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
          resultStorage.reset();
          eval0.evaluate(tuple, inputPointable);
          eval1.evaluate(tuple, fieldToRemovePointable);
          if (PointableHelper.checkAndSetMissingOrNull(result, inputPointable, fieldToRemovePointable)) {
              return;
          }
  
          // Check the type of our first argument.
          byte[] data = inputPointable.getByteArray();
          int offset = inputPointable.getStartOffset();
          byte typeTag = data[offset];
          if (typeTag != ATypeTag.SERIALIZED_RECORD_TYPE_TAG) {
              PointableHelper.setNull(result);
              return;
          }
  
          // Check the type of our second argument.
          data = fieldToRemovePointable.getByteArray();
          offset = fieldToRemovePointable.getStartOffset();
          typeTag = data[offset];
          if (typeTag != ATypeTag.SERIALIZED_STRING_TYPE_TAG) {
              PointableHelper.setNull(result);
              return;
          }
  
          try {
              outRecordBuilder.reset(outRecType);
              outputRecordTypeInfo.reset(outRecType);
              if (inputRecordPointable == null) {
                  inputRecordPointable = pointableAllocator.allocateRecordValue(inRecType);
              }
              inputRecordPointable.set(inputPointable);
              final List<IVisitablePointable> fieldNames = inputRecordPointable.getFieldNames();
              final List<IVisitablePointable> fieldValues = inputRecordPointable.getFieldValues();
              for (int i = 0, fieldCount = fieldNames.size(); i < fieldCount; i++) {
                  final IVisitablePointable fieldName = fieldNames.get(i);
                  final IVisitablePointable fieldValue = fieldValues.get(i);
                  if (!PointableHelper.isEqual(fieldName, fieldToRemovePointable, stringBinaryComparator)) {
                      int pos = outputRecordTypeInfo.getFieldIndex(fieldName.getByteArray(),
                              fieldName.getStartOffset() + 1, fieldName.getLength() - 1);
                      if (pos >= 0) {
                          outRecordBuilder.addField(pos, fieldValue);
                      } else {
                          outRecordBuilder.addField(fieldName, fieldValue);
                      }
                  }
              }
              outRecordBuilder.write(resultOutput, true);
  
          } catch (IOException e) {
              throw HyracksDataException.create(e);
          }
          result.set(resultStorage);
      }
  }
  