[bugfix] Fix the bug that flink decimal cannot be converted to the st…

…arRocks bigint unsigned data type.

Signed-off-by: danzheuwju <danyuhao@qq.com>

src/main/java/com/starrocks/connector/flink/manager/StarRocksSinkTable.java

@@ -228,6 +228,7 @@ public StarRocksSinkTable build() {
         typesMap.put("smallint", Arrays.asList(LogicalTypeRoot.SMALLINT, LogicalTypeRoot.INTEGER, LogicalTypeRoot.BINARY));
         typesMap.put("varchar", Arrays.asList(LogicalTypeRoot.VARCHAR, LogicalTypeRoot.ARRAY, LogicalTypeRoot.MAP, LogicalTypeRoot.ROW));
         typesMap.put("string", Arrays.asList(LogicalTypeRoot.CHAR, LogicalTypeRoot.VARCHAR, LogicalTypeRoot.ARRAY, LogicalTypeRoot.MAP, LogicalTypeRoot.ROW));
+        typesMap.put("bigint unsigned", Arrays.asList(LogicalTypeRoot.DECIMAL));
     }
 
 }