Program: 8883
Project: 8883
Buggy source:
private AbstractIterator<SolrResultRow> getIterator(final Filter filter,final List<OrderEntry> sortOrder,final String parent,final int parentDepth){
  return new AbstractIterator<SolrResultRow>(){
    private final Set<String> seenPaths=Sets.newHashSet();
    private final Deque<SolrResultRow> queue=Queues.newArrayDeque();
    private int offset=0;
    private boolean noDocs=false;
    private long numFound=0;
    @Override protected SolrResultRow computeNext(){
      if (!queue.isEmpty() || loadDocs()) {
        return queue.remove();
      }
      return endOfData();
    }
    private SolrResultRow convertToRow(    SolrDocument doc){
      String path=String.valueOf(doc.getFieldValue(configuration.getPathField()));
      if (path != null) {
        if ("String_Node_Str".equals(path)) {
          path="String_Node_Str";
        }
        if (!parent.isEmpty()) {
          path=getAncestorPath(path,parentDepth);
          if (seenPaths.contains(path)) {
            return null;
          }
          seenPaths.add(path);
        }
        float score=0f;
        Object scoreObj=doc.get("String_Node_Str");
        if (scoreObj != null) {
          score=(Float)scoreObj;
        }
        return new SolrResultRow(path,score,doc);
      }
      return null;
    }
    /** 
 * Loads the Solr documents in batches
 * @return true if any document is loaded
 */
    private boolean loadDocs(){
      if (noDocs) {
        return false;
      }
      try {
        if (log.isDebugEnabled()) {
          log.debug("String_Node_Str",filter);
        }
        SolrQuery query=FilterQueryParser.getQuery(filter,sortOrder,configuration);
        if (numFound > 0) {
          offset++;
          int newOffset=offset * configuration.getRows();
          if (newOffset >= numFound) {
            return false;
          }
          query.setParam("String_Node_Str",String.valueOf(newOffset));
        }
        if (log.isDebugEnabled()) {
          log.debug("String_Node_Str",query);
        }
        QueryResponse queryResponse=solrServer.query(query);
        if (log.isDebugEnabled()) {
          log.debug("String_Node_Str",queryResponse.getHeader());
        }
        SolrDocumentList docs=queryResponse.getResults();
        if (docs != null) {
          numFound=docs.getNumFound();
          onRetrievedDocs(filter,docs);
          for (          SolrDocument doc : docs) {
            SolrResultRow row=convertToRow(doc);
            if (row != null) {
              queue.add(row);
            }
          }
        }
        SpellCheckResponse spellCheckResponse=queryResponse.getSpellCheckResponse();
        if (spellCheckResponse != null && spellCheckResponse.getSuggestions() != null && spellCheckResponse.getSuggestions().size() > 0) {
          SolrDocument fakeDoc=getSpellChecks(spellCheckResponse,filter);
          queue.add(new SolrResultRow("String_Node_Str",1.0,fakeDoc));
          noDocs=true;
        }
        NamedList<Object> response=queryResponse.getResponse();
        Map suggest=(Map)response.get("String_Node_Str");
        if (suggest != null) {
          Set<Map.Entry<String,Object>> suggestEntries=suggest.entrySet();
          if (!suggestEntries.isEmpty()) {
            SolrDocument fakeDoc=getSuggestions(suggestEntries,filter);
            queue.add(new SolrResultRow("String_Node_Str",1.0,fakeDoc));
            noDocs=true;
          }
        }
      }
 catch (      Exception e) {
        if (log.isWarnEnabled()) {
          log.warn("String_Node_Str",solrServer,e);
        }
      }
      return !queue.isEmpty();
    }
  }
;
}

Fixed version (ground truth):
private AbstractIterator<SolrResultRow> getIterator(final Filter filter,final List<OrderEntry> sortOrder,final String parent,final int parentDepth){
  return new AbstractIterator<SolrResultRow>(){
    private final Set<String> seenPaths=Sets.newHashSet();
    private final Deque<SolrResultRow> queue=Queues.newArrayDeque();
    private int offset=0;
    private boolean noDocs=false;
    private long numFound=0;
    @Override protected SolrResultRow computeNext(){
      if (!queue.isEmpty() || loadDocs()) {
        return queue.remove();
      }
      return endOfData();
    }
    private SolrResultRow convertToRow(    SolrDocument doc){
      String path=String.valueOf(doc.getFieldValue(configuration.getPathField()));
      if ("String_Node_Str".equals(path)) {
        path="String_Node_Str";
      }
      if (!parent.isEmpty()) {
        path=getAncestorPath(path,parentDepth);
        if (seenPaths.contains(path)) {
          return null;
        }
        seenPaths.add(path);
      }
      float score=0f;
      Object scoreObj=doc.get("String_Node_Str");
      if (scoreObj != null) {
        score=(Float)scoreObj;
      }
      return new SolrResultRow(path,score,doc);
    }
    /** 
 * Loads the Solr documents in batches
 * @return true if any document is loaded
 */
    private boolean loadDocs(){
      if (noDocs) {
        return false;
      }
      try {
        if (log.isDebugEnabled()) {
          log.debug("String_Node_Str",filter);
        }
        SolrQuery query=FilterQueryParser.getQuery(filter,sortOrder,configuration);
        if (numFound > 0) {
          offset++;
          int newOffset=offset * configuration.getRows();
          if (newOffset >= numFound) {
            return false;
          }
          query.setParam("String_Node_Str",String.valueOf(newOffset));
        }
        if (log.isDebugEnabled()) {
          log.debug("String_Node_Str",query);
        }
        QueryResponse queryResponse=solrServer.query(query);
        if (log.isDebugEnabled()) {
          log.debug("String_Node_Str",queryResponse.getHeader());
        }
        SolrDocumentList docs=queryResponse.getResults();
        if (docs != null) {
          numFound=docs.getNumFound();
          onRetrievedDocs(filter,docs);
          for (          SolrDocument doc : docs) {
            SolrResultRow row=convertToRow(doc);
            if (row != null) {
              queue.add(row);
            }
          }
        }
        SpellCheckResponse spellCheckResponse=queryResponse.getSpellCheckResponse();
        if (spellCheckResponse != null && spellCheckResponse.getSuggestions() != null && spellCheckResponse.getSuggestions().size() > 0) {
          SolrDocument fakeDoc=getSpellChecks(spellCheckResponse,filter);
          queue.add(new SolrResultRow("String_Node_Str",1.0,fakeDoc));
          noDocs=true;
        }
        NamedList<Object> response=queryResponse.getResponse();
        Map suggest=(Map)response.get("String_Node_Str");
        if (suggest != null) {
          Set<Map.Entry<String,Object>> suggestEntries=suggest.entrySet();
          if (!suggestEntries.isEmpty()) {
            SolrDocument fakeDoc=getSuggestions(suggestEntries,filter);
            queue.add(new SolrResultRow("String_Node_Str",1.0,fakeDoc));
            noDocs=true;
          }
        }
      }
 catch (      Exception e) {
        if (log.isWarnEnabled()) {
          log.warn("String_Node_Str",solrServer,e);
        }
      }
      return !queue.isEmpty();
    }
  }
;
}