| package edu.uci.ics.asterix.dataflow.data.common; |
| |
| |
| import edu.uci.ics.asterix.om.types.AUnionType; |
| import edu.uci.ics.asterix.om.types.IAType; |
| import edu.uci.ics.asterix.om.types.TypeHelper; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.INullableTypeComputer; |
| |
| public class AqlNullableTypeComputer implements INullableTypeComputer { |
| |
| public static final AqlNullableTypeComputer INSTANCE = new AqlNullableTypeComputer(); |
| |
| private AqlNullableTypeComputer() { |
| } |
| |
| @Override |
| public IAType makeNullableType(Object type) throws AlgebricksException { |
| IAType t = (IAType) type; |
| if (TypeHelper.canBeNull(t)) { |
| return t; |
| } else { |
| return AUnionType.createNullableType(t); |
| } |
| } |
| |
| } |