[TD-10700]<enhance>: fixed uppercase tag in escape quote issue

src/client/src/tscParseOpenTSDB.c

@@ -65,7 +65,7 @@ static int32_t parseTelnetMetric(TAOS_SML_DATA_POINT *pSml, const char **index,
       }
     }
 
-    pSml->stableName[len] = *cur;
+    pSml->stableName[len] = tolower(*cur);
 
     cur++;
     len++;
@@ -240,6 +240,7 @@ static int32_t parseTelnetTagKey(TAOS_SML_KV *pKV, const char **index, SHashObj
 
   pKV->key = tcalloc(len + TS_ESCAPE_CHAR_SIZE + 1, 1);
   memcpy(pKV->key, key, len + 1);
+  strntolower_s(pKV->key, pKV->key, (int32_t)len);
   addEscapeCharToString(pKV->key, len);
   //tscDebug("OTD:0x%"PRIx64" Key:%s|len:%d", info->id, pKV->key, len);
   *index = cur + 1;

tests/pytest/insert/insertTelnetLines.py

@@ -316,6 +316,7 @@ class TDTestCase:
                         "double 1626006833610ms 2 id=for 456=true int=true double=false into=1 from=2 !@#$.%^&*()=false",
                         "from 1626006833610ms 2 id=!@#.^& 456=true int=true double=false into=1 from=2 !@#$.%^&*()=false",
                         "!@#$.%^&*() 1626006833610ms 2 id=none 456=true int=true double=false into=1 from=2 !@#$.%^&*()=false",
+                        "STABLE 1626006833610ms 2 id=!@#.^& 456=true int=true double=false TAG=1 FROM=2 COLUMN=false",
                      ]
 
         code = self._conn.schemaless_insert(lines4_1, TDSmlProtocolType.TELNET.value, TDSmlTimestampType.NOT_CONFIGURED.value)
@@ -336,6 +337,9 @@ class TDTestCase:
         tdSql.query('describe `!@#$.%^&*()`')
         tdSql.checkRows(8)
 
+        tdSql.query('describe `stable`')
+        tdSql.checkRows(8)
+
         tdSql.query('select * from `123`')
         tdSql.checkRows(1)