Github user arunmahadevan commented on a diff in the pull request:
    --- Diff: 
external/sql/storm-sql-runtime/src/test/org/apache/storm/sql/ ---
    @@ -60,6 +62,25 @@ public static String result(String accumulator) {
    +  public static class TopN {
    +    public static PriorityQueue<Integer> init() {
    +      return new PriorityQueue<>();
    +    }
    +    public static PriorityQueue<Integer> add(PriorityQueue<Integer> 
accumulator, Integer n, Integer val) {
    +      if (accumulator.size() >= n) {
    --- End diff --
    yes, it will throw NPE if n is 0, since it tries to peek from empty queue. 
will address this.

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