Program: 51115
Project: 51115
Buggy source:
public Calc compileCall(final ResolvedFunCall call,ExpCompiler compiler){
  final ListCalc listCalc=compiler.compileList(call.getArg(0),true);
  final IntegerCalc integerCalc=compiler.compileInteger(call.getArg(1));
  final LevelCalc levelCalc=call.getArgCount() > 2 && call.getArg(2).getCategory() != Category.Empty ? compiler.compileLevel(call.getArg(2)) : null;
  final Calc orderCalc=call.getArgCount() > 3 ? compiler.compileScalar(call.getArg(3),true) : new ValueCalc(new DummyExp(new ScalarType()));
  return new AbstractListCalc(call,new Calc[]{listCalc,integerCalc,orderCalc}){
    public List evaluateList(    Evaluator evaluator){
      SchemaReader schemaReader=evaluator.getSchemaReader();
      NativeEvaluator nativeEvaluator=schemaReader.getNativeSetEvaluator(call.getFunDef(),call.getArgs(),evaluator,this);
      if (nativeEvaluator != null) {
        return (List)nativeEvaluator.execute(ResultStyle.LIST);
      }
      List<Member> list=listCalc.evaluateList(evaluator);
      int n=integerCalc.evaluateInteger(evaluator);
      if (n == FunUtil.IntegerNull || n <= 0) {
        return list;
      }
      Level level;
      if (levelCalc == null) {
        level=null;
      }
 else {
        level=levelCalc.evaluateLevel(evaluator);
      }
      List<Member> result=new ArrayList<Member>();
      for (      Member member : list) {
        result.add(member);
        if (level != null && member.getLevel() != level) {
          if (level.getDimension() != member.getDimension()) {
            throw newEvalException(DrilldownLevelTopBottomFunDef.this,"String_Node_Str" + level.getUniqueName() + "String_Node_Str"+ member.getUniqueName()+ "String_Node_Str");
          }
          continue;
        }
        List<Member> children=schemaReader.getMemberChildren(member);
        final List<Member> sortedChildren=sortMembers(evaluator.push(),children,children,orderCalc,top,true);
        int x=Math.min(n,sortedChildren.size());
        for (int i=0; i < x; i++) {
          result.add(sortedChildren.get(i));
        }
      }
      return result;
    }
    public boolean dependsOn(    Dimension dimension){
      return anyDependsButFirst(getCalcs(),dimension);
    }
  }
;
}

Fixed version (ground truth):
public Calc compileCall(final ResolvedFunCall call,ExpCompiler compiler){
  final ListCalc listCalc=compiler.compileList(call.getArg(0),true);
  final IntegerCalc integerCalc=compiler.compileInteger(call.getArg(1));
  final LevelCalc levelCalc=call.getArgCount() > 2 && call.getArg(2).getCategory() != Category.Empty ? compiler.compileLevel(call.getArg(2)) : null;
  final Calc orderCalc=call.getArgCount() > 3 ? compiler.compileScalar(call.getArg(3),true) : new ValueCalc(new DummyExp(new ScalarType()));
  return new AbstractListCalc(call,new Calc[]{listCalc,integerCalc,orderCalc}){
    public List evaluateList(    Evaluator evaluator){
      SchemaReader schemaReader=evaluator.getSchemaReader();
      NativeEvaluator nativeEvaluator=schemaReader.getNativeSetEvaluator(call.getFunDef(),call.getArgs(),evaluator,this);
      if (nativeEvaluator != null) {
        return (List)nativeEvaluator.execute(ResultStyle.LIST);
      }
      List<Member> list=listCalc.evaluateList(evaluator);
      int n=integerCalc.evaluateInteger(evaluator);
      if (n == FunUtil.IntegerNull || n <= 0) {
        return list;
      }
      Level level;
      if (levelCalc == null) {
        level=null;
      }
 else {
        level=levelCalc.evaluateLevel(evaluator);
      }
      List<Member> result=new ArrayList<Member>();
      for (      Member member : list) {
        result.add(member);
        if (level != null && member.getLevel() != level) {
          if (level.getDimension() != member.getDimension()) {
            throw newEvalException(DrilldownLevelTopBottomFunDef.this,"String_Node_Str" + level.getUniqueName() + "String_Node_Str"+ member.getUniqueName()+ "String_Node_Str");
          }
          continue;
        }
        List<Member> children=schemaReader.getMemberChildren(member);
        final List<Member> sortedChildren=sortMembers(evaluator.push(false),children,children,orderCalc,top,true);
        int x=Math.min(n,sortedChildren.size());
        for (int i=0; i < x; i++) {
          result.add(sortedChildren.get(i));
        }
      }
      return result;
    }
    public boolean dependsOn(    Dimension dimension){
      return anyDependsButFirst(getCalcs(),dimension);
    }
  }
;
}