[TD-4412]<fix>: add new configuration parameter for db option precision

src/common/src/tglobal.c

@@ -817,6 +817,16 @@ static void doInitGlobalConfig(void) {
   cfg.unitType = TAOS_CFG_UTYPE_NONE;
   taosInitConfigOption(cfg);
 
+  cfg.option = "precision";
+  cfg.ptr = &tsTimePrecision;
+  cfg.valType = TAOS_CFG_VTYPE_INT8;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_SHOW;
+  cfg.minValue = TSDB_MIN_PRECISION;
+  cfg.maxValue = TSDB_MAX_PRECISION;
+  cfg.ptrLength = 0;
+  cfg.unitType = TAOS_CFG_UTYPE_NONE;
+  taosInitConfigOption(cfg);
+
   cfg.option = "comp";
   cfg.ptr = &tsCompression;
   cfg.valType = TAOS_CFG_VTYPE_INT8;

tests/pytest/functions/showOfflineThresholdIs864000.py

@@ -25,7 +25,7 @@ class TDTestCase:
 
     def run(self):
         tdSql.query("show variables")
-        tdSql.checkData(52, 1, 864000)
+        tdSql.checkData(53, 1, 864000)
 
     def stop(self):
         tdSql.close()