Program: 146579
Project: 146579
Buggy source:
private String[] analyseScopeSufficientColumnList(ScopeLimitedReferenceRequestCache cache){
  String[] limitedScope=cache.getInternalScopedLimit(this.getInstanceName());
  if (limitedScope != null) {
    return limitedScope;
  }
  Set<TreeReference> referencesInScope=cache.getLimitedReferenceSet(this.getInstanceName());
  StorageIndexedTreeElementModel model=parent.getModelTemplate();
  TreeReference baseRefForChildElement=this.getRef().genericize();
  Vector<String> relativeSteps=model.getIndexedTreeReferenceSteps();
  HashMap<TreeReference,String> stepToColumnName=new HashMap<>();
  for (  String relativeStep : relativeSteps) {
    stepToColumnName.put(XPathReference.getPathExpr(relativeStep).getReference(),StorageIndexedTreeElementModel.getSqlColumnNameFromElementOrAttribute(relativeStep));
  }
  boolean failed=false;
  HashSet<String> columnNameCacheLoads=new HashSet<>();
  for (  TreeReference inScopeReference : referencesInScope) {
    TreeReference subReference=inScopeReference.relativize(baseRefForChildElement);
    if (!stepToColumnName.containsKey(subReference)) {
      failed=true;
      break;
    }
 else {
      columnNameCacheLoads.add(stepToColumnName.get(subReference));
    }
  }
  if (failed) {
    cache.setScopeLimitUnhelpful(this.getInstanceName());
    return null;
  }
  String[] columnList=new String[columnNameCacheLoads.size()];
  int i=0;
  for (  String s : columnNameCacheLoads) {
    columnList[i]=s;
    i++;
  }
  cache.setInternalScopeLimit(this.getInstanceName(),columnList);
  return columnList;
}

Fixed version (ground truth):
private String[] analyseScopeSufficientColumnList(ScopeLimitedReferenceRequestCache cache){
  String[] limitedScope=cache.getInternalScopedLimit(this.getInstanceName());
  if (limitedScope != null) {
    return limitedScope;
  }
  Set<TreeReference> referencesInScope=cache.getLimitedReferenceSet(this.getInstanceName());
  StorageIndexedTreeElementModel model=parent.getModelTemplate();
  TreeReference baseRefForChildElement=this.getRef().genericize();
  Vector<String> relativeSteps=model.getIndexedTreeReferenceSteps();
  HashMap<TreeReference,String> stepToColumnName=new HashMap<>();
  for (  String relativeStep : relativeSteps) {
    stepToColumnName.put(XPathReference.getPathExpr(relativeStep).getReference(),StorageIndexedTreeElementModel.getSqlColumnNameFromElementOrAttribute(relativeStep));
  }
  boolean failed=false;
  HashSet<String> columnNameCacheLoads=new HashSet<>();
  for (  TreeReference inScopeReference : referencesInScope) {
    if (inScopeReference.equals(baseRefForChildElement)) {
      continue;
    }
    TreeReference subReference=inScopeReference.relativize(baseRefForChildElement);
    if (!stepToColumnName.containsKey(subReference)) {
      failed=true;
      break;
    }
 else {
      columnNameCacheLoads.add(stepToColumnName.get(subReference));
    }
  }
  if (failed) {
    cache.setScopeLimitUnhelpful(this.getInstanceName());
    return null;
  }
  String[] columnList=new String[columnNameCacheLoads.size()];
  int i=0;
  for (  String s : columnNameCacheLoads) {
    columnList[i]=s;
    i++;
  }
  cache.setInternalScopeLimit(this.getInstanceName(),columnList);
  return columnList;
}