Merge pull request #16783 from taosdata/szhou/2.4/fixbugs

fix: syntax error when no fields in line

src/client/src/tscParseLineProtocol.c

@@ -2608,7 +2608,7 @@ int32_t tscParseLine(const char* sql, TAOS_SML_DATA_POINT* smlData, SSmlLinesInf
     return ret;
   }
   tscDebug("SML:0x%"PRIx64" Parse fields finished, num of fields:%d", info->id, smlData->fieldNum);
-  if (smlData->fieldNum == 0) {
+  if (smlData->fieldNum <= 1) {
     tscDebug("SML:0x%"PRIx64" Parse fields error, no field in line", info->id);
     taosHashCleanup(keyHashTable);
     return TSDB_CODE_TSC_LINE_SYNTAX_ERROR;

tests/pytest/insert/line_insert.py

@@ -208,6 +208,14 @@ class TDTestCase:
 
         tdSql.query("select * from type_json5")
         tdSql.checkData(0, 2, '''{"jsonC":"0"}''')
+        try:
+            self._conn.schemaless_insert([
+                                    "measurement,host=host1 field1=12i,field2=2.0,fieldKey=\"Launch\" 1654078242716",
+                                    "measurement,host=host1"
+                                    ], TDSmlProtocolType.LINE.value, TDSmlTimestampType.MILLI_SECOND.value)
+            tdLog.exit("%s failed: no exception happen here" % __file__)           
+        except Exception as e:
+            pass
 
     def stop(self):
         tdSql.close()