Fix issue 149 by appointing a unique uid to each sink operator. (#150)

diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/tools/cdc/DatabaseSync.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/tools/cdc/DatabaseSync.java
index 84d5b57..1699d52 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/tools/cdc/DatabaseSync.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/tools/cdc/DatabaseSync.java
@@ -117,7 +117,7 @@
             DataStream<String> sideOutput = parsedStream.getSideOutput(recordOutputTag);
 
             int sinkParallel = sinkConfig.getInteger(DorisConfigOptions.SINK_PARALLELISM, sideOutput.getParallelism());
-            sideOutput.sinkTo(buildDorisSink(table)).setParallelism(sinkParallel).name(table);
+            sideOutput.sinkTo(buildDorisSink(table)).setParallelism(sinkParallel).name(table).uid(table);
         }
     }