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.om.typecomputer.impl;
  
  import org.apache.asterix.om.typecomputer.base.IResultTypeComputer;
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.asterix.om.types.AUnionType;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.asterix.om.types.IAType;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
  import org.apache.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
  import org.apache.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
  
  public class LocalSingleVarStatisticsTypeComputer implements IResultTypeComputer {
  
      public static final LocalSingleVarStatisticsTypeComputer INSTANCE = new LocalSingleVarStatisticsTypeComputer();
  
      @Override
      public IAType computeType(ILogicalExpression expression, IVariableTypeEnvironment env,
              IMetadataProvider<?, ?> metadataProvider) throws AlgebricksException {
          return new ARecordType(null, new String[] { "m1", "m2", "m3", "m4", "count" },
                  new IAType[] { AUnionType.createNullableType(BuiltinType.ADOUBLE, "OptionalDouble"),
                          AUnionType.createNullableType(BuiltinType.ADOUBLE, "OptionalDouble"),
                          AUnionType.createNullableType(BuiltinType.ADOUBLE, "OptionalDouble"),
                          AUnionType.createNullableType(BuiltinType.ADOUBLE, "OptionalDouble"), BuiltinType.AINT64 },
                  false);
      }
  }
  