Program: 13186
Project: 13186
Buggy source:
@Override public Symbol visitFunction(Function function,Context context){
  if (AndOperator.NAME.equals(function.info().ident().name())) {
    context.multiRelation=false;
    context.seenRelation=null;
    Symbol left=process(function.arguments().get(0),context);
    function.arguments().set(0,left);
    boolean leftMultiRel=context.multiRelation;
    AnalyzedRelation leftRelation=context.seenRelation;
    context.multiRelation=false;
    context.seenRelation=null;
    Symbol right=process(function.arguments().get(1),context);
    function.arguments().set(1,right);
    boolean rightMultiRel=context.multiRelation;
    AnalyzedRelation rightRelation=context.seenRelation;
    if (leftMultiRel && rightMultiRel) {
      context.multiRelation=true;
      return function;
    }
 else     if (leftMultiRel) {
      if (rightRelation != null) {
        context.queries.put(rightRelation,right);
        function.arguments().set(1,Literal.BOOLEAN_TRUE);
        context.seenRelation=null;
        return function;
      }
 else {
        context.multiRelation=true;
        return function;
      }
    }
 else     if (rightMultiRel) {
      if (leftRelation != null) {
        context.queries.put(leftRelation,left);
        function.arguments().set(0,Literal.BOOLEAN_TRUE);
        context.seenRelation=null;
        return function;
      }
 else {
        context.multiRelation=true;
        return function;
      }
    }
    if (leftRelation != rightRelation) {
      if (leftRelation == null) {
        context.seenRelation=rightRelation;
        context.multiRelation=false;
      }
 else       if (rightRelation == null) {
        context.seenRelation=leftRelation;
        context.multiRelation=false;
      }
 else {
        context.queries.put(leftRelation,left);
        function.arguments().set(0,Literal.BOOLEAN_TRUE);
        context.seenRelation=rightRelation;
      }
    }
  }
 else {
    context.seenRelations.clear();
    RelationSplitter.RelationCounter.INSTANCE.process(function,context.seenRelations);
    context.multiRelation=context.seenRelations.size() > 1;
    if (context.seenRelations.size() == 1) {
      context.seenRelation=Iterables.getOnlyElement(context.seenRelations);
    }
 else     if (context.seenRelations.isEmpty()) {
      context.seenRelation=null;
    }
 else {
      context.multiRelation=true;
      context.seenRelation=null;
    }
  }
  return function;
}

Fixed version (ground truth):
@Override public Symbol visitFunction(Function function,Context context){
  if (AndOperator.NAME.equals(function.info().ident().name())) {
    context.multiRelation=false;
    context.seenRelation=null;
    Symbol left=process(function.arguments().get(0),context);
    function.arguments().set(0,left);
    boolean leftMultiRel=context.multiRelation;
    AnalyzedRelation leftRelation=context.seenRelation;
    context.multiRelation=false;
    context.seenRelation=null;
    Symbol right=process(function.arguments().get(1),context);
    function.arguments().set(1,right);
    boolean rightMultiRel=context.multiRelation;
    AnalyzedRelation rightRelation=context.seenRelation;
    if (leftMultiRel && rightMultiRel) {
      context.multiRelation=true;
      return function;
    }
 else     if (leftMultiRel) {
      context.multiRelation=true;
      if (rightRelation != null) {
        context.queries.put(rightRelation,right);
        function.arguments().set(1,Literal.BOOLEAN_TRUE);
        context.seenRelation=null;
        return function;
      }
      return function;
    }
 else     if (rightMultiRel) {
      context.multiRelation=true;
      if (leftRelation != null) {
        context.queries.put(leftRelation,left);
        function.arguments().set(0,Literal.BOOLEAN_TRUE);
        context.seenRelation=null;
        return function;
      }
      return function;
    }
    if (leftRelation != rightRelation) {
      if (leftRelation == null) {
        context.seenRelation=rightRelation;
        context.multiRelation=false;
      }
 else       if (rightRelation == null) {
        context.seenRelation=leftRelation;
        context.multiRelation=false;
      }
 else {
        context.queries.put(leftRelation,left);
        function.arguments().set(0,Literal.BOOLEAN_TRUE);
        context.seenRelation=rightRelation;
      }
    }
  }
 else {
    context.seenRelations.clear();
    RelationSplitter.RelationCounter.INSTANCE.process(function,context.seenRelations);
    context.multiRelation=context.seenRelations.size() > 1;
    if (context.seenRelations.size() == 1) {
      context.seenRelation=Iterables.getOnlyElement(context.seenRelations);
    }
 else     if (context.seenRelations.isEmpty()) {
      context.seenRelation=null;
    }
 else {
      context.multiRelation=true;
      context.seenRelation=null;
    }
  }
  return function;
}