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;
  
  import java.io.DataOutput;
  
  import org.apache.asterix.dataflow.data.nontagged.serde.ABooleanSerializerDeserializer;
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.ABoolean;
  import org.apache.asterix.om.base.AMissing;
  import org.apache.asterix.om.base.ANull;
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
  import org.apache.asterix.runtime.exceptions.TypeMismatchException;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
  import org.apache.hyracks.api.context.IEvaluatorContext;
  import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
  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.data.std.util.ArrayBackedValueStorage;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  public class OrDescriptor extends AbstractScalarFunctionDynamicDescriptor {
      private static final long serialVersionUID = 1L;
      public static final IFunctionDescriptorFactory FACTORY = OrDescriptor::new;
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.OR;
      }
  
      @Override
      public IScalarEvaluatorFactory createEvaluatorFactory(final IScalarEvaluatorFactory[] args) {
          return new IScalarEvaluatorFactory() {
              private static final long serialVersionUID = 1L;
  
              @Override
              public IScalarEvaluator createScalarEvaluator(final IEvaluatorContext ctx) throws HyracksDataException {
                  final IPointable argPtr = new VoidPointable();
                  final IScalarEvaluator[] evals = new IScalarEvaluator[args.length];
                  for (int i = 0; i < evals.length; i++) {
                      evals[i] = args[i].createScalarEvaluator(ctx);
                  }
  
                  return new IScalarEvaluator() {
                      private ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                      private DataOutput output = resultStorage.getDataOutput();
                      @SuppressWarnings("unchecked")
                      private ISerializerDeserializer<ABoolean> booleanSerde =
                              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ABOOLEAN);
                      @SuppressWarnings("unchecked")
                      private ISerializerDeserializer<ANull> nullSerde =
                              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ANULL);
                      @SuppressWarnings("unchecked")
                      private ISerializerDeserializer<AMissing> missingSerde =
                              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.AMISSING);
  
                      @Override
                      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                          resultStorage.reset();
                          int n = args.length;
                          boolean res = false;
                          boolean metNull = false;
                          boolean metMissing = false;
                          for (int i = 0; i < n; i++) {
                              evals[i].evaluate(tuple, argPtr);
                              byte[] data = argPtr.getByteArray();
                              int offset = argPtr.getStartOffset();
                              if (data[offset] == ATypeTag.SERIALIZED_MISSING_TYPE_TAG) {
                                  metMissing = true;
                                  continue;
                              }
                              if (data[offset] == ATypeTag.SERIALIZED_NULL_TYPE_TAG) {
                                  metNull = true;
                                  continue;
                              }
                              if (data[offset] != ATypeTag.SERIALIZED_BOOLEAN_TYPE_TAG) {
                                  throw new TypeMismatchException(sourceLoc, getIdentifier(), i, data[offset],
                                          ATypeTag.SERIALIZED_BOOLEAN_TYPE_TAG);
                              }
                              boolean argResult = ABooleanSerializerDeserializer.getBoolean(data, offset + 1);
                              if (argResult) {
                                  // anything OR TRUE = TRUE
                                  booleanSerde.serialize(ABoolean.TRUE, output);
                                  result.set(resultStorage);
                                  return;
                              }
                              res |= argResult;
                          }
                          if (metNull) {
                              // NULL OR FALSE = NULL
                              // NULL OR MISSING = NULL
                              nullSerde.serialize(ANull.NULL, output);
                          } else if (metMissing) {
                              // MISSING OR FALSE = MISSING
                              missingSerde.serialize(AMissing.MISSING, output);
                          } else {
                              ABoolean aResult = res ? ABoolean.TRUE : ABoolean.FALSE;
                              booleanSerde.serialize(aResult, output);
                          }
                          result.set(resultStorage);
                      }
                  };
              }
          };
      }
  
  }
  