add debug message

Author: Nicole00

client/src/test/java/com/vesoft/nebula/driver/graph/decode/NebulaClientDecodeTest.java

@@ -183,6 +183,7 @@ public void testConstVectorDecimalResult() {
             ResultSet finalPosInfRes = res;
             Exception exception = assertThrows(RuntimeException.class, () ->
                 finalPosInfRes.next().values().get(0).asDecimal());
+            exception.printStackTrace();
             System.out.println("====decimal message:" + Arrays.toString(exception.getStackTrace()));
             assertTrue(exception.getMessage().contains("+Inf"));