[TS-653]<fix>: forbidden count(tbname) to mix up with agg, proj etc.

src/client/src/tscSQLParser.c

@@ -3637,6 +3637,7 @@ static bool functionCompatibleCheck(SQueryInfo* pQueryInfo, bool joinQuery, bool
   int32_t prjNum = 0;
   int32_t aggNum = 0;
   int32_t scalNum = 0;
+  int32_t countTbname = 0;
 
   size_t numOfExpr = tscNumOfExprs(pQueryInfo);
   assert(numOfExpr > 0);
@@ -3691,9 +3692,13 @@ static bool functionCompatibleCheck(SQueryInfo* pQueryInfo, bool joinQuery, bool
     if (functionId == TSDB_FUNC_LAST_ROW && (joinQuery || twQuery || !groupbyTagsOrNull(pQueryInfo))) {
       return false;
     }
+
+    if (functionId == TSDB_FUNC_COUNT && (pExpr1->base.colInfo.colId == TSDB_TBNAME_COLUMN_INDEX || TSDB_COL_IS_TAG(pExpr1->base.colInfo.flag))) {
+      ++countTbname;
+    }
   }
 
-  aggNum = (int32_t)size - prjNum - scalNum - aggUdf - scalarUdf;
+  aggNum = (int32_t)size - prjNum - scalNum - aggUdf - scalarUdf - countTbname;
 
   assert(aggNum >= 0);
 
@@ -3709,6 +3714,10 @@ static bool functionCompatibleCheck(SQueryInfo* pQueryInfo, bool joinQuery, bool
     return false;
   }
 
+  if (countTbname && (prjNum > 0 || aggNum > 0 || scalarUdf > 0 || aggUdf > 0)) {
+    return false;
+  }
+
   return true;
 }
 

tests/pytest/query/queryCnameDisplay.py

@@ -79,16 +79,22 @@ class TDTestCase:
         tdSql.execute('insert into st1 values (now, 1, 2, 1.1, 2.2, "a", 1, 1, false, "bb");')
 
         # select as cname with cname_list
-        sql_seq = f'select count(ts) as {cname_list[0]}, sum(pi1) as {cname_list[1]}, avg(pi2) as {cname_list[2]}, count(pf1) as {cname_list[3]}, count(pf2) as {cname_list[4]}, count(ps1) as {cname_list[5]}, min(pi3) as {cname_list[6]}, max(pi4) as {cname_list[7]}, count(pb1) as {cname_list[8]}, count(ps2) as {cname_list[9]}, count(si1) as {cname_list[10]}, count(si2) as {cname_list[11]}, count(sf1) as {cname_list[12]}, count(sf2) as {cname_list[13]}, count(ss1) as {cname_list[14]}, count(si3) as {cname_list[15]}, count(si4) as {cname_list[16]}, count(sb1) as {cname_list[17]}, count(ss2) as {cname_list[18]} from super_table_cname_check'
-        sql_seq_no_as = sql_seq.replace(' as ', ' ')
-        res = tdSql.getColNameList(sql_seq)
-        res_no_as = tdSql.getColNameList(sql_seq_no_as)
+        sql_seq1 = f'select count(ts) as {cname_list[0]}, sum(pi1) as {cname_list[1]}, avg(pi2) as {cname_list[2]}, count(pf1) as {cname_list[3]}, count(pf2) as {cname_list[4]}, count(ps1) as {cname_list[5]}, min(pi3) as {cname_list[6]}, max(pi4) as {cname_list[7]}, count(pb1) as {cname_list[8]}, count(ps2) as {cname_list[9]} from super_table_cname_check'
+        sql_seq2 = f'select count(si1) as {cname_list[10]}, count(si2) as {cname_list[11]}, count(sf1) as {cname_list[12]}, count(sf2) as {cname_list[13]}, count(ss1) as {cname_list[14]}, count(si3) as {cname_list[15]}, count(si4) as {cname_list[16]}, count(sb1) as {cname_list[17]}, count(ss2) as {cname_list[18]} from super_table_cname_check'
+        sql_seq_no_as1 = sql_seq1.replace(' as ', ' ')
+        sql_seq_no_as2 = sql_seq2.replace(' as ', ' ')
+        res1 = tdSql.getColNameList(sql_seq1)
+        res2 = tdSql.getColNameList(sql_seq2)
+        res_no_as1 = tdSql.getColNameList(sql_seq_no_as1)
+        res_no_as2 = tdSql.getColNameList(sql_seq_no_as2)
 
         # cname[1] > 64, it is expected to be equal to 64
         cname_list_1_expected = cname_list[1][:-1]
         cname_list[1] = cname_list_1_expected
-        checkColNameList = tdSql.checkColNameList(res, cname_list)
-        checkColNameList = tdSql.checkColNameList(res_no_as, cname_list)
+        tdSql.checkColNameList(res1, cname_list[:10])
+        tdSql.checkColNameList(res2, cname_list[10:])
+        tdSql.checkColNameList(res_no_as1, cname_list[:10])
+        tdSql.checkColNameList(res_no_as2, cname_list[10:])
         
     def run(self):
         tdSql.prepare()