Merge pull request #21 from JLY2015/master

bugfix: query async next need init before using resultSet

Author: JLY2015

src/main/java/com/alipay/oceanbase/rpc/stream/async/ObTableQueryAsyncClientResultSet.java

@@ -52,7 +52,8 @@ public ObTableQueryAsyncClientResultSet(ObTableClientQueryAsyncImpl obTableClien
     public boolean next() throws Exception {
         boolean res = false;
         // 对于分区/非分区表，从第一个分区0开始，在每个分区内都执行init和next；如此迭代每一个分区。直到isHasMore=false且分区都遍历完
-        if (cur < partitionIndex || resultSet.isHasMore() || partitionIndex == 0) {
+        if (cur < partitionIndex || partitionIndex == 0 || resultSet == null
+            || resultSet.isHasMore()) {
             if (resultSet == null) {
                 resultSet = this.obTableClientQueryAsync.getTableQuery()
                     .executeInit(lists.get(cur));
@@ -124,4 +125,4 @@ public void init() throws Exception {
     public void close() throws Exception {
         resultSet.getQueryStreamResult().close();
     }
-}
+}