Program: 131948
Project: 131948
Buggy source:
@Override public Object executeTransform(final Object input){
  if (graph == null) {
    graph=pipeline.getGraphDatabase();
    final OClass cls=graph.getEdgeType(edgeClass);
    if (cls == null)     graph.createEdgeType(edgeClass);
  }
  Object joinValue;
  final OrientVertex vertex;
  if (input instanceof ODocument) {
    joinValue=((ODocument)input).field(joinFieldName);
    vertex=graph.getVertex(input);
  }
 else {
    joinValue=((OrientVertex)input).getProperty(joinFieldName);
    vertex=(OrientVertex)input;
  }
  if (joinValue != null) {
    Object result=null;
    if (sqlQuery == null && index == null) {
      if (lookup.toUpperCase().startsWith("String_Node_Str"))       sqlQuery=new OSQLSynchQuery<OrientVertex>(lookup);
 else       index=pipeline.getDocumentDatabase().getMetadata().getIndexManager().getIndex(lookup);
    }
    if (sqlQuery != null)     result=graph.command(sqlQuery).execute(joinValue);
 else {
      final OType idxFieldType=index.getDefinition().getTypes()[0];
      joinValue=idxFieldType.convert(joinValue,idxFieldType.getDefaultJavaType());
      result=index.get(joinValue);
    }
    if (result != null) {
      if (result instanceof Collection<?>) {
        if (!((Collection)result).isEmpty())         result=((Collection)result).iterator().next();
 else         result=null;
      }
      if (result != null) {
        final OrientVertex targetVertex=graph.getVertex(result);
        vertex.addEdge(edgeClass,targetVertex);
      }
    }
    if (result == null) {
switch (unresolvedLinkAction) {
case CREATE:
        if (lookup != null) {
          final String[] lookupParts=lookup.split("String_Node_Str");
          final OrientVertex linkedV=graph.addTemporaryVertex(lookupParts[0]);
          linkedV.setProperty(lookupParts[1],joinValue);
          linkedV.save();
          result=linkedV;
        }
 else         throw new OConfigurationException("String_Node_Str");
      break;
case ERROR:
    processor.getStats().incrementErrors();
  log("String_Node_Str",getName(),joinValue);
break;
case WARNING:
processor.getStats().incrementWarnings();
log("String_Node_Str",getName(),joinValue);
break;
case SKIP:
return null;
case HALT:
throw new OETLProcessHaltedException("String_Node_Str" + joinValue + "String_Node_Str");
}
}
}
return input;
}

Fixed version (ground truth):
@Override public Object executeTransform(final Object input){
  if (graph == null) {
    graph=pipeline.getGraphDatabase();
    final OClass cls=graph.getEdgeType(edgeClass);
    if (cls == null)     graph.createEdgeType(edgeClass);
  }
  final OrientVertex vertex;
  if (input instanceof OIdentifiable)   vertex=graph.getVertex(input);
 else   if (input instanceof OrientVertex)   vertex=(OrientVertex)input;
 else   throw new OTransformException("String_Node_Str" + input + "String_Node_Str");
  Object joinValue=vertex.getProperty(joinFieldName);
  if (joinValue != null) {
    Object result=null;
    if (sqlQuery == null && index == null) {
      if (lookup.toUpperCase().startsWith("String_Node_Str"))       sqlQuery=new OSQLSynchQuery<OrientVertex>(lookup);
 else       index=pipeline.getDocumentDatabase().getMetadata().getIndexManager().getIndex(lookup);
    }
    if (sqlQuery != null)     result=graph.command(sqlQuery).execute(joinValue);
 else {
      final OType idxFieldType=index.getDefinition().getTypes()[0];
      joinValue=idxFieldType.convert(joinValue,idxFieldType.getDefaultJavaType());
      result=index.get(joinValue);
    }
    if (result != null) {
      if (result instanceof Collection<?>) {
        if (!((Collection)result).isEmpty())         result=((Collection)result).iterator().next();
 else         result=null;
      }
      if (result != null) {
        final OrientVertex targetVertex=graph.getVertex(result);
        vertex.addEdge(edgeClass,targetVertex);
      }
    }
    if (result == null) {
switch (unresolvedLinkAction) {
case CREATE:
        if (lookup != null) {
          final String[] lookupParts=lookup.split("String_Node_Str");
          final OrientVertex linkedV=graph.addTemporaryVertex(lookupParts[0]);
          linkedV.setProperty(lookupParts[1],joinValue);
          linkedV.save();
          result=linkedV;
        }
 else         throw new OConfigurationException("String_Node_Str");
      break;
case ERROR:
    processor.getStats().incrementErrors();
  log("String_Node_Str",getName(),joinValue);
break;
case WARNING:
processor.getStats().incrementWarnings();
log("String_Node_Str",getName(),joinValue);
break;
case SKIP:
return null;
case HALT:
throw new OETLProcessHaltedException("String_Node_Str" + joinValue + "String_Node_Str");
}
}
}
return input;
}