[TD-4972]<fix>:fix error about double precision conversion on timestamp expr value

src/client/src/tscSQLParser.c

@@ -3341,6 +3341,7 @@ static int32_t doExtractColumnFilterInfo(SSqlCmd* pCmd, SQueryInfo* pQueryInfo,
     if (pRight->flags & (1 << EXPR_FLAG_NS_TIMESTAMP)) {
       pRight->value.i64 =
           convertTimePrecision(pRight->value.i64, TSDB_TIME_PRECISION_NANO, timePrecision);
+      pRight->flags &= ~(1 << EXPR_FLAG_NS_TIMESTAMP);
     }
   }
 
@@ -4905,6 +4906,7 @@ int32_t getTimeRange(STimeWindow* win, tSqlExpr* pRight, int32_t optr, int16_t t
      */
     if (pRight->flags & (1 << EXPR_FLAG_NS_TIMESTAMP)) {
       pRight->value.i64 = convertTimePrecision(pRight->value.i64, TSDB_TIME_PRECISION_NANO, timePrecision);
+      pRight->flags &= ~(1 << EXPR_FLAG_NS_TIMESTAMP);
     }
 
     tVariantDump(&pRight->value, (char*)&val, TSDB_DATA_TYPE_BIGINT, true);

tests/script/general/parser/where.sim

@@ -352,18 +352,24 @@ if $rows != 0 then
  return -1
 endi
 
-print ==========================> td-4783
+print ==========================> td-4783,td-4792
 sql create table where_ts(ts timestamp, f int)
 sql insert into where_ts values('2021-06-19 16:22:00', 1);
 sql insert into where_ts values('2021-06-19 16:23:00', 2);
 sql insert into where_ts values('2021-06-19 16:24:00', 3);
 sql insert into where_ts values('2021-06-19 16:25:00', 1);
 sql select * from (select * from where_ts) where ts<'2021-06-19 16:25:00' and ts>'2021-06-19 16:22:00'
-if $row != 2 then
+if $rows != 2 then
   return -1
 endi
 print $data00, $data01
 if $data01 != 2 then
   return -1
 endi
+sql insert into where_ts values(now, 5);
+sleep 10
+sql select * from (select * from where_ts) where ts<now;
+if $rows != 5 then
+  return -1
+endi
 system sh/exec.sh -n dnode1 -s stop -x SIGINT