Bug 183579 Model need hold on DimensionConditionHandle and DimensionJoinConditionHandle signleton or overwrites the equals and hashcode method
The Dataset Joint Editor need join two Editparts which have the same model. But the DimensionConditionHandle and the DimensionJoinConditionHandle are create a new instance erery time when I get them. So model need hold on them signleton or overwrites the equals and hashcode method.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/MemberRef.java
assert ref.refType == PROPERTY_LISTn_MEMBER;
					assert !ref.member[0].isList( );
					refType = PROPERTY_LISTn_MEMBER_MEMBER;
					member[0] = ref.member[0];
					index[0] = ref.index[0];
					member[1] = memberDefn;
					depth = 1;
				}
			}
		}
		else
		{
			if ( ref.refType == PROPERTY )
			{
				
				refType = PROPERTY_MEMBER;
				member[0] = memberDefn;
				index[0] = -1;
				depth = 1;
			}
			else if ( ref.refType == PROPERTY_MEMBER )
			{
				
				assert !ref.member[0].isList( );
				refType = PROPERTY_MEMBER_MEMBER;
				member[0] = ref.member[0];
				index[0] = -1;
				member[1] = memberDefn;
				depth = 1;
			}