Program: 168799
Project: 168799
Buggy source:
private void renderJoinPath(StringBuilder sb,JoinAliasInfo joinBase,JoinNode node){
  if (node.getTreatType() != null) {
    if (mainQuery.jpaProvider.supportsTreatJoin()) {
      sb.append("String_Node_Str");
      renderAlias(sb,joinBase.getJoinNode(),mainQuery.jpaProvider.supportsRootTreatTreatJoin());
      sb.append('.');
      sb.append(node.getParentTreeNode().getRelationName());
      sb.append("String_Node_Str");
      sb.append(node.getTreatType().getName());
      sb.append(')');
    }
 else     if (mainQuery.jpaProvider.supportsSubtypeRelationResolving()) {
      sb.append(joinBase.getAlias()).append('.').append(node.getParentTreeNode().getRelationName());
    }
 else {
      throw new IllegalArgumentException("String_Node_Str");
    }
  }
 else   if (node.getCorrelationPath() == null && node.getAliasInfo().isRootNode()) {
    sb.append(node.getEntityType().getName());
  }
 else   if (node.isQualifiedJoin()) {
    sb.append(node.getQualificationExpression());
    sb.append('(');
    sb.append(joinBase.getJoinNode().getAlias());
    sb.append(')');
  }
 else {
    renderAlias(sb,joinBase.getJoinNode(),mainQuery.jpaProvider.supportsRootTreatJoin());
    sb.append('.').append(node.getParentTreeNode().getRelationName());
  }
}

Fixed version (ground truth):
private String renderJoinPath(StringBuilder sb,JoinAliasInfo joinBase,JoinNode node,List<String> whereConjuncts){
  if (node.getTreatType() != null) {
    final boolean renderTreat=mainQuery.jpaProvider.supportsTreatJoin() && (!mainQuery.jpaProvider.supportsSubtypeRelationResolving() || node.getJoinType() == JoinType.INNER);
    final String onCondition;
    final JoinNode baseNode=joinBase.getJoinNode();
    final String treatType=node.getTreatType().getName();
    final String relationName=node.getParentTreeNode().getRelationName();
    JpaProvider.ConstraintType constraintType=mainQuery.jpaProvider.requiresTreatFilter(baseNode.getManagedType(),relationName,node.getJoinType());
    if (constraintType != JpaProvider.ConstraintType.NONE) {
      String constraint="String_Node_Str" + node.getAlias() + "String_Node_Str"+ treatType;
      if (constraintType == JpaProvider.ConstraintType.WHERE) {
        whereConjuncts.add(constraint);
        onCondition=null;
      }
 else {
        onCondition=constraint;
      }
    }
 else {
      onCondition=null;
    }
    if (renderTreat) {
      sb.append("String_Node_Str");
      renderAlias(sb,baseNode,mainQuery.jpaProvider.supportsRootTreatTreatJoin());
      sb.append('.');
      sb.append(relationName);
      sb.append("String_Node_Str");
      sb.append(treatType);
      sb.append(')');
    }
 else     if (mainQuery.jpaProvider.supportsSubtypeRelationResolving()) {
      sb.append(joinBase.getAlias()).append('.').append(node.getParentTreeNode().getRelationName());
    }
 else {
      throw new IllegalArgumentException("String_Node_Str");
    }
    return onCondition;
  }
 else   if (node.getCorrelationPath() == null && node.getAliasInfo().isRootNode()) {
    sb.append(node.getEntityType().getName());
  }
 else   if (node.isQualifiedJoin()) {
    sb.append(node.getQualificationExpression());
    sb.append('(');
    sb.append(joinBase.getJoinNode().getAlias());
    sb.append(')');
  }
 else {
    renderAlias(sb,joinBase.getJoinNode(),mainQuery.jpaProvider.supportsRootTreatJoin());
    sb.append('.').append(node.getParentTreeNode().getRelationName());
  }
  return null;
}