add test cases for TD-29904

tests/army/community/query/show.py

@@ -125,10 +125,13 @@ class TDTestCase(TBase):
         sqls = [
             "show scores;",
             "SHOW CLUSTER VARIABLES",
-            "SHOW BNODES;",
+            # "SHOW BNODES;",
         ]
         tdSql.executes(sqls)
 
+        # verification for TD-29904
+        tdSql.error("show tags from t100000", expectErrInfo='Fail to get table info, error: Table does not exist')
+
 
     # run
     def run(self):
@@ -143,6 +146,9 @@ class TDTestCase(TBase):
         # do action
         self.doQuery()
 
+        # check show
+        self.checkShow()
+
 
         tdLog.success(f"{__file__} successfully executed")