Program: 67587
Project: 67587
Buggy source:
/** 
 * @param ds
 * @param columns
 */
public void updateModel(DataSetHandle ds,DataSetViewData[] columns){
  PropertyHandle handle=ds.getPropertyHandle(DataSetHandle.COLUMN_HINTS_PROP);
  PropertyHandle resultSetColumnHandle=ds.getPropertyHandle(DataSetHandle.RESULT_SET_HINTS_PROP);
  Iterator iter=handle.iterator();
  if (iter != null) {
    while (iter.hasNext()) {
      ColumnHintHandle hint=(ColumnHintHandle)iter.next();
      for (int n=0; n < columns.length; n++) {
        String columnName=columns[n].getName();
        if (resultSetColumnHandle != null && (columnName == null || columnName.trim().length() == 0)) {
          Iterator resultIter=resultSetColumnHandle.iterator();
          if (resultIter != null) {
            while (resultIter.hasNext()) {
              ResultSetColumnHandle column=(ResultSetColumnHandle)resultIter.next();
              if (column.getPosition().intValue() == n + 1) {
                columnName=column.getColumnName();
                break;
              }
            }
          }
          if (columnName == null) {
            columnName="String_Node_Str";
          }
          columns[n].setName(columnName);
        }
        if (columns[n].getName().equals(hint.getColumnName())) {
          if (hint.getDisplayNameKey() != null) {
            columns[n].setExternalizedName(hint.getExternalizedValue(org.eclipse.birt.report.model.api.elements.structures.ComputedColumn.DISPLAY_NAME_ID_MEMBER,org.eclipse.birt.report.model.api.elements.structures.ComputedColumn.DISPLAY_NAME_MEMBER,hint.getModule().getLocale()));
          }
          columns[n].setDisplayName(hint.getDisplayName());
          columns[n].setDisplayNameKey(hint.getDisplayNameKey());
          columns[n].setAlias(hint.getAlias());
          columns[n].setHelpText(hint.getHelpText());
          columns[n].setAnalysis(getDefaultAnalysisType(columns[n].getDataTypeName(),hint.getAnalysis()));
          columns[n].setACLExpression(hint.getACLExpression());
          break;
        }
      }
    }
  }
}

Fixed version (ground truth):
/** 
 * @param ds
 * @param columns
 */
public void updateModel(DataSetHandle ds,DataSetViewData[] columns){
  PropertyHandle handle=ds.getPropertyHandle(DataSetHandle.COLUMN_HINTS_PROP);
  PropertyHandle resultSetColumnHandle=ds.getPropertyHandle(DataSetHandle.RESULT_SET_HINTS_PROP);
  Iterator iter=handle.iterator();
  if (iter != null) {
    while (iter.hasNext()) {
      ColumnHintHandle hint=(ColumnHintHandle)iter.next();
      for (int n=0; n < columns.length; n++) {
        String columnName=columns[n].getName();
        if (resultSetColumnHandle != null && (columnName == null || columnName.trim().length() == 0)) {
          Iterator resultIter=resultSetColumnHandle.iterator();
          if (resultIter != null) {
            while (resultIter.hasNext()) {
              ResultSetColumnHandle column=(ResultSetColumnHandle)resultIter.next();
              if (column.getPosition().intValue() == n + 1) {
                columnName=column.getColumnName();
                break;
              }
            }
          }
          if (columnName == null) {
            columnName="String_Node_Str";
          }
          columns[n].setName(columnName);
        }
        if (columns[n].getName().equals(hint.getColumnName())) {
          if (hint.getDisplayNameKey() != null) {
            columns[n].setExternalizedName(hint.getExternalizedValue(org.eclipse.birt.report.model.api.elements.structures.ComputedColumn.DISPLAY_NAME_ID_MEMBER,org.eclipse.birt.report.model.api.elements.structures.ComputedColumn.DISPLAY_NAME_MEMBER,hint.getModule().getLocale()));
          }
          columns[n].setDisplayName(hint.getDisplayName());
          columns[n].setDisplayNameKey(hint.getDisplayNameKey());
          columns[n].setAlias(hint.getAlias());
          columns[n].setHelpText(hint.getHelpText());
          columns[n].setAnalysis(getDefaultAnalysisType(columns[n].getName(),columns[n].getDataTypeName(),hint.getAnalysis()));
          columns[n].setACLExpression(hint.getACLExpression());
          break;
        }
      }
    }
  }
}