diff --git a/include/common/tcommon.h b/include/common/tcommon.h
index ea764e6760..111c9dde3c 100644
--- a/include/common/tcommon.h
+++ b/include/common/tcommon.h
@@ -250,6 +250,7 @@ typedef struct SQueryTableDataCond {
   int32_t      type;       // data block load type:
   bool         skipRollup;
   STimeWindow  twindows;
+  STimeWindow  extTwindows[2];
   int64_t      startVersion;
   int64_t      endVersion;
   bool         notLoadData;  // response the actual data, not only the rows in the attribute of info.row of ssdatablock
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead2.c b/source/dnode/vnode/src/tsdb/tsdbRead2.c
index cc896dfa80..441d073666 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead2.c
@@ -1134,7 +1134,12 @@ static int32_t getCurrentBlockInfo(SDataBlockIter* pBlockIter, SFileDataBlockInf
   *pInfo = NULL;
 
   size_t num = TARRAY_SIZE(pBlockIter->blockList);
-  TSDB_CHECK_CONDITION(num != 0, code, lino, _end, TSDB_CODE_INVALID_PARA);
+  if (num == 0) {
+    // Some callers would attempt to call this function. Filter out certain normal cases and return directly to avoid
+    // generating excessive unnecessary error logs.
+    TSDB_CHECK_CONDITION(num == pBlockIter->numOfBlocks, code, lino, _end, TSDB_CODE_INVALID_PARA);
+    return TSDB_CODE_INVALID_PARA;
+  }
 
   *pInfo = taosArrayGet(pBlockIter->blockList, pBlockIter->index);
   TSDB_CHECK_NULL(*pInfo, code, lino, _end, TSDB_CODE_INVALID_PARA);
@@ -5530,12 +5535,10 @@ int32_t tsdbReaderOpen2(void* pVnode, SQueryTableDataCond* pCond, void* pTableLi
     // update the SQueryTableDataCond to create inner reader
     int32_t order = pCond->order;
     if (order == TSDB_ORDER_ASC) {
-      pCond->twindows.ekey = window.skey - 1;
-      pCond->twindows.skey = INT64_MIN;
+      pCond->twindows = pCond->extTwindows[0];
       pCond->order = TSDB_ORDER_DESC;
     } else {
-      pCond->twindows.skey = window.ekey + 1;
-      pCond->twindows.ekey = INT64_MAX;
+      pCond->twindows = pCond->extTwindows[1];
       pCond->order = TSDB_ORDER_ASC;
     }
 
@@ -5544,11 +5547,9 @@ int32_t tsdbReaderOpen2(void* pVnode, SQueryTableDataCond* pCond, void* pTableLi
     TSDB_CHECK_CODE(code, lino, _end);
 
     if (order == TSDB_ORDER_ASC) {
-      pCond->twindows.skey = window.ekey + 1;
-      pCond->twindows.ekey = INT64_MAX;
+      pCond->twindows = pCond->extTwindows[1];
     } else {
-      pCond->twindows.skey = INT64_MIN;
-      pCond->twindows.ekey = window.ekey - 1;
+      pCond->twindows = pCond->extTwindows[0];
     }
     pCond->order = order;
 
diff --git a/source/libs/executor/src/timesliceoperator.c b/source/libs/executor/src/timesliceoperator.c
index f77aa8f34a..50deba932f 100644
--- a/source/libs/executor/src/timesliceoperator.c
+++ b/source/libs/executor/src/timesliceoperator.c
@@ -1131,6 +1131,47 @@ static int32_t extractPkColumnFromFuncs(SNodeList* pFuncs, bool* pHasPk, SColumn
   return TSDB_CODE_SUCCESS;
 }
 
+/**
+ * @brief Determine the actual time range for reading data based on the RANGE clause and the WHERE conditions.
+ * @param[in] cond The range specified by WHERE condition.
+ * @param[in] range The range specified by RANGE clause.
+ * @param[out] twindow The range to be read in DESC order, and only one record is needed.
+ * @param[out] extTwindow The external range to read for only one record, which is used for FILL clause.
+ * @note `cond` and `twindow` may be the same address.
+ */
+static int32_t getQueryExtWindow(const STimeWindow* cond, const STimeWindow* range, STimeWindow* twindow,
+                                 STimeWindow* extTwindows) {
+  int32_t code = TSDB_CODE_SUCCESS;
+  int32_t lino = 0;
+  STimeWindow tempWindow;
+
+  if (cond->skey > cond->ekey || range->skey > range->ekey) {
+    *twindow = extTwindows[0] = extTwindows[1] = TSWINDOW_DESC_INITIALIZER;
+    return code;
+  }
+
+  if (range->ekey < cond->skey) {
+    extTwindows[1] = *cond;
+    *twindow = extTwindows[0] = TSWINDOW_DESC_INITIALIZER;
+    return code;
+  }
+
+  if (cond->ekey < range->skey) {
+    extTwindows[0] = *cond;
+    *twindow = extTwindows[1] = TSWINDOW_DESC_INITIALIZER;
+    return code;
+  }
+
+  // Only scan data in the time range intersecion.
+  extTwindows[0] = extTwindows[1] = *cond;
+  twindow->skey = TMAX(cond->skey, range->skey);
+  twindow->ekey = TMIN(cond->ekey, range->ekey);
+  extTwindows[0].ekey = twindow->skey - 1;
+  extTwindows[1].skey = twindow->ekey + 1;
+
+  return code;
+}
+
 int32_t createTimeSliceOperatorInfo(SOperatorInfo* downstream, SPhysiNode* pPhyNode, SExecTaskInfo* pTaskInfo, SOperatorInfo** pOptrInfo) {
   QRY_PARAM_CHECK(pOptrInfo);
 
@@ -1206,8 +1247,10 @@ int32_t createTimeSliceOperatorInfo(SOperatorInfo* downstream, SPhysiNode* pPhyN
 
   if (downstream->operatorType == QUERY_NODE_PHYSICAL_PLAN_TABLE_SCAN) {
     STableScanInfo* pScanInfo = (STableScanInfo*)downstream->info;
-    pScanInfo->base.cond.twindows = pInfo->win;
-    pScanInfo->base.cond.type = TIMEWINDOW_RANGE_EXTERNAL;
+    SQueryTableDataCond *cond = &pScanInfo->base.cond;
+    cond->type = TIMEWINDOW_RANGE_EXTERNAL;
+    code = getQueryExtWindow(&cond->twindows, &pInfo->win, &cond->twindows, cond->extTwindows);
+    QUERY_CHECK_CODE(code, lino, _error);
   }
 
   setOperatorInfo(pOperator, "TimeSliceOperator", QUERY_NODE_PHYSICAL_PLAN_INTERP_FUNC, false, OP_NOT_OPENED, pInfo,
diff --git a/tests/army/query/function/ans/interp.csv b/tests/army/query/function/ans/interp.csv
index e1ba236aa1..3eaccd887a 100644
--- a/tests/army/query/function/ans/interp.csv
+++ b/tests/army/query/function/ans/interp.csv
@@ -366,3 +366,652 @@ taos> select _irowts as irowts ,tbname as table_name, c2 as c_c2, c3 as c_c3, _i
  2020-02-01 00:00:16.000 | td32727                        |          10 |                    10 | true     |       1 |
  2020-02-01 00:00:16.000 | td32727                        |          15 |                    15 | true     |       1 |
 
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-02 00:00:00' and '2020-01-01 00:00:00' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(null);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-02 00:00:00' and '2020-01-01 00:00:00' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(value, 1);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-02 00:00:00' and '2020-01-01 00:00:00' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(prev);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-02 00:00:00' and '2020-01-01 00:00:00' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(next);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-02 00:00:00' and '2020-01-01 00:00:00' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(linear);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-02 00:00:00' range('2020-01-01 00:00:30', '2020-01-01 00:00:00') every(1s) fill(null);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-02 00:00:00' range('2020-01-01 00:00:30', '2020-01-01 00:00:00') every(1s) fill(value, 1);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-02 00:00:00' range('2020-01-01 00:00:30', '2020-01-01 00:00:00') every(1s) fill(prev);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-02 00:00:00' range('2020-01-01 00:00:30', '2020-01-01 00:00:00') every(1s) fill(next);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-02 00:00:00' range('2020-01-01 00:00:30', '2020-01-01 00:00:00') every(1s) fill(linear);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:20' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(null);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:20' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(value, 1);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:20' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(prev);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:20' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(next);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:20' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(linear);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(null);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:21.000 | false     |          21 |
+ 2020-01-01 00:00:22.000 | true      | NULL        |
+ 2020-01-01 00:00:23.000 | true      | NULL        |
+ 2020-01-01 00:00:24.000 | true      | NULL        |
+ 2020-01-01 00:00:25.000 | true      | NULL        |
+ 2020-01-01 00:00:26.000 | true      | NULL        |
+ 2020-01-01 00:00:27.000 | true      | NULL        |
+ 2020-01-01 00:00:28.000 | true      | NULL        |
+ 2020-01-01 00:00:29.000 | true      | NULL        |
+ 2020-01-01 00:00:30.000 | true      | NULL        |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(value, 1);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:21.000 | false     |          21 |
+ 2020-01-01 00:00:22.000 | true      |           1 |
+ 2020-01-01 00:00:23.000 | true      |           1 |
+ 2020-01-01 00:00:24.000 | true      |           1 |
+ 2020-01-01 00:00:25.000 | true      |           1 |
+ 2020-01-01 00:00:26.000 | true      |           1 |
+ 2020-01-01 00:00:27.000 | true      |           1 |
+ 2020-01-01 00:00:28.000 | true      |           1 |
+ 2020-01-01 00:00:29.000 | true      |           1 |
+ 2020-01-01 00:00:30.000 | true      |           1 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(prev);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:21.000 | false     |          21 |
+ 2020-01-01 00:00:22.000 | true      |          21 |
+ 2020-01-01 00:00:23.000 | true      |          21 |
+ 2020-01-01 00:00:24.000 | true      |          21 |
+ 2020-01-01 00:00:25.000 | true      |          21 |
+ 2020-01-01 00:00:26.000 | true      |          21 |
+ 2020-01-01 00:00:27.000 | true      |          21 |
+ 2020-01-01 00:00:28.000 | true      |          21 |
+ 2020-01-01 00:00:29.000 | true      |          21 |
+ 2020-01-01 00:00:30.000 | true      |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(next);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(linear);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:15', '2020-01-01 00:00:30') every(1s) fill(null);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      | NULL        |
+ 2020-01-01 00:00:17.000 | true      | NULL        |
+ 2020-01-01 00:00:18.000 | true      | NULL        |
+ 2020-01-01 00:00:19.000 | true      | NULL        |
+ 2020-01-01 00:00:20.000 | true      | NULL        |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+ 2020-01-01 00:00:22.000 | true      | NULL        |
+ 2020-01-01 00:00:23.000 | true      | NULL        |
+ 2020-01-01 00:00:24.000 | true      | NULL        |
+ 2020-01-01 00:00:25.000 | true      | NULL        |
+ 2020-01-01 00:00:26.000 | true      | NULL        |
+ 2020-01-01 00:00:27.000 | true      | NULL        |
+ 2020-01-01 00:00:28.000 | true      | NULL        |
+ 2020-01-01 00:00:29.000 | true      | NULL        |
+ 2020-01-01 00:00:30.000 | true      | NULL        |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:15', '2020-01-01 00:00:30') every(1s) fill(value, 1);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |           1 |
+ 2020-01-01 00:00:17.000 | true      |           1 |
+ 2020-01-01 00:00:18.000 | true      |           1 |
+ 2020-01-01 00:00:19.000 | true      |           1 |
+ 2020-01-01 00:00:20.000 | true      |           1 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+ 2020-01-01 00:00:22.000 | true      |           1 |
+ 2020-01-01 00:00:23.000 | true      |           1 |
+ 2020-01-01 00:00:24.000 | true      |           1 |
+ 2020-01-01 00:00:25.000 | true      |           1 |
+ 2020-01-01 00:00:26.000 | true      |           1 |
+ 2020-01-01 00:00:27.000 | true      |           1 |
+ 2020-01-01 00:00:28.000 | true      |           1 |
+ 2020-01-01 00:00:29.000 | true      |           1 |
+ 2020-01-01 00:00:30.000 | true      |           1 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:15', '2020-01-01 00:00:30') every(1s) fill(prev);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          15 |
+ 2020-01-01 00:00:17.000 | true      |          15 |
+ 2020-01-01 00:00:18.000 | true      |          15 |
+ 2020-01-01 00:00:19.000 | true      |          15 |
+ 2020-01-01 00:00:20.000 | true      |          15 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+ 2020-01-01 00:00:22.000 | true      |          21 |
+ 2020-01-01 00:00:23.000 | true      |          21 |
+ 2020-01-01 00:00:24.000 | true      |          21 |
+ 2020-01-01 00:00:25.000 | true      |          21 |
+ 2020-01-01 00:00:26.000 | true      |          21 |
+ 2020-01-01 00:00:27.000 | true      |          21 |
+ 2020-01-01 00:00:28.000 | true      |          21 |
+ 2020-01-01 00:00:29.000 | true      |          21 |
+ 2020-01-01 00:00:30.000 | true      |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:15', '2020-01-01 00:00:30') every(1s) fill(next);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          21 |
+ 2020-01-01 00:00:17.000 | true      |          21 |
+ 2020-01-01 00:00:18.000 | true      |          21 |
+ 2020-01-01 00:00:19.000 | true      |          21 |
+ 2020-01-01 00:00:20.000 | true      |          21 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:15', '2020-01-01 00:00:30') every(1s) fill(linear);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          16 |
+ 2020-01-01 00:00:17.000 | true      |          17 |
+ 2020-01-01 00:00:18.000 | true      |          18 |
+ 2020-01-01 00:00:19.000 | true      |          19 |
+ 2020-01-01 00:00:20.000 | true      |          20 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(null);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | false     |           0 |
+ 2020-01-01 00:00:01.000 | false     |           1 |
+ 2020-01-01 00:00:02.000 | true      | NULL        |
+ 2020-01-01 00:00:03.000 | false     |           3 |
+ 2020-01-01 00:00:04.000 | true      | NULL        |
+ 2020-01-01 00:00:05.000 | true      | NULL        |
+ 2020-01-01 00:00:06.000 | false     |           6 |
+ 2020-01-01 00:00:07.000 | true      | NULL        |
+ 2020-01-01 00:00:08.000 | true      | NULL        |
+ 2020-01-01 00:00:09.000 | true      | NULL        |
+ 2020-01-01 00:00:10.000 | false     |          10 |
+ 2020-01-01 00:00:11.000 | true      | NULL        |
+ 2020-01-01 00:00:12.000 | true      | NULL        |
+ 2020-01-01 00:00:13.000 | true      | NULL        |
+ 2020-01-01 00:00:14.000 | true      | NULL        |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      | NULL        |
+ 2020-01-01 00:00:17.000 | true      | NULL        |
+ 2020-01-01 00:00:18.000 | true      | NULL        |
+ 2020-01-01 00:00:19.000 | true      | NULL        |
+ 2020-01-01 00:00:20.000 | true      | NULL        |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+ 2020-01-01 00:00:22.000 | true      | NULL        |
+ 2020-01-01 00:00:23.000 | true      | NULL        |
+ 2020-01-01 00:00:24.000 | true      | NULL        |
+ 2020-01-01 00:00:25.000 | true      | NULL        |
+ 2020-01-01 00:00:26.000 | true      | NULL        |
+ 2020-01-01 00:00:27.000 | true      | NULL        |
+ 2020-01-01 00:00:28.000 | true      | NULL        |
+ 2020-01-01 00:00:29.000 | true      | NULL        |
+ 2020-01-01 00:00:30.000 | true      | NULL        |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(value, 1);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | false     |           0 |
+ 2020-01-01 00:00:01.000 | false     |           1 |
+ 2020-01-01 00:00:02.000 | true      |           1 |
+ 2020-01-01 00:00:03.000 | false     |           3 |
+ 2020-01-01 00:00:04.000 | true      |           1 |
+ 2020-01-01 00:00:05.000 | true      |           1 |
+ 2020-01-01 00:00:06.000 | false     |           6 |
+ 2020-01-01 00:00:07.000 | true      |           1 |
+ 2020-01-01 00:00:08.000 | true      |           1 |
+ 2020-01-01 00:00:09.000 | true      |           1 |
+ 2020-01-01 00:00:10.000 | false     |          10 |
+ 2020-01-01 00:00:11.000 | true      |           1 |
+ 2020-01-01 00:00:12.000 | true      |           1 |
+ 2020-01-01 00:00:13.000 | true      |           1 |
+ 2020-01-01 00:00:14.000 | true      |           1 |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |           1 |
+ 2020-01-01 00:00:17.000 | true      |           1 |
+ 2020-01-01 00:00:18.000 | true      |           1 |
+ 2020-01-01 00:00:19.000 | true      |           1 |
+ 2020-01-01 00:00:20.000 | true      |           1 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+ 2020-01-01 00:00:22.000 | true      |           1 |
+ 2020-01-01 00:00:23.000 | true      |           1 |
+ 2020-01-01 00:00:24.000 | true      |           1 |
+ 2020-01-01 00:00:25.000 | true      |           1 |
+ 2020-01-01 00:00:26.000 | true      |           1 |
+ 2020-01-01 00:00:27.000 | true      |           1 |
+ 2020-01-01 00:00:28.000 | true      |           1 |
+ 2020-01-01 00:00:29.000 | true      |           1 |
+ 2020-01-01 00:00:30.000 | true      |           1 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(prev);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | false     |           0 |
+ 2020-01-01 00:00:01.000 | false     |           1 |
+ 2020-01-01 00:00:02.000 | true      |           1 |
+ 2020-01-01 00:00:03.000 | false     |           3 |
+ 2020-01-01 00:00:04.000 | true      |           3 |
+ 2020-01-01 00:00:05.000 | true      |           3 |
+ 2020-01-01 00:00:06.000 | false     |           6 |
+ 2020-01-01 00:00:07.000 | true      |           6 |
+ 2020-01-01 00:00:08.000 | true      |           6 |
+ 2020-01-01 00:00:09.000 | true      |           6 |
+ 2020-01-01 00:00:10.000 | false     |          10 |
+ 2020-01-01 00:00:11.000 | true      |          10 |
+ 2020-01-01 00:00:12.000 | true      |          10 |
+ 2020-01-01 00:00:13.000 | true      |          10 |
+ 2020-01-01 00:00:14.000 | true      |          10 |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          15 |
+ 2020-01-01 00:00:17.000 | true      |          15 |
+ 2020-01-01 00:00:18.000 | true      |          15 |
+ 2020-01-01 00:00:19.000 | true      |          15 |
+ 2020-01-01 00:00:20.000 | true      |          15 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+ 2020-01-01 00:00:22.000 | true      |          21 |
+ 2020-01-01 00:00:23.000 | true      |          21 |
+ 2020-01-01 00:00:24.000 | true      |          21 |
+ 2020-01-01 00:00:25.000 | true      |          21 |
+ 2020-01-01 00:00:26.000 | true      |          21 |
+ 2020-01-01 00:00:27.000 | true      |          21 |
+ 2020-01-01 00:00:28.000 | true      |          21 |
+ 2020-01-01 00:00:29.000 | true      |          21 |
+ 2020-01-01 00:00:30.000 | true      |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(next);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | false     |           0 |
+ 2020-01-01 00:00:01.000 | false     |           1 |
+ 2020-01-01 00:00:02.000 | true      |           3 |
+ 2020-01-01 00:00:03.000 | false     |           3 |
+ 2020-01-01 00:00:04.000 | true      |           6 |
+ 2020-01-01 00:00:05.000 | true      |           6 |
+ 2020-01-01 00:00:06.000 | false     |           6 |
+ 2020-01-01 00:00:07.000 | true      |          10 |
+ 2020-01-01 00:00:08.000 | true      |          10 |
+ 2020-01-01 00:00:09.000 | true      |          10 |
+ 2020-01-01 00:00:10.000 | false     |          10 |
+ 2020-01-01 00:00:11.000 | true      |          15 |
+ 2020-01-01 00:00:12.000 | true      |          15 |
+ 2020-01-01 00:00:13.000 | true      |          15 |
+ 2020-01-01 00:00:14.000 | true      |          15 |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          21 |
+ 2020-01-01 00:00:17.000 | true      |          21 |
+ 2020-01-01 00:00:18.000 | true      |          21 |
+ 2020-01-01 00:00:19.000 | true      |          21 |
+ 2020-01-01 00:00:20.000 | true      |          21 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(linear);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | false     |           0 |
+ 2020-01-01 00:00:01.000 | false     |           1 |
+ 2020-01-01 00:00:02.000 | true      |           2 |
+ 2020-01-01 00:00:03.000 | false     |           3 |
+ 2020-01-01 00:00:04.000 | true      |           4 |
+ 2020-01-01 00:00:05.000 | true      |           5 |
+ 2020-01-01 00:00:06.000 | false     |           6 |
+ 2020-01-01 00:00:07.000 | true      |           7 |
+ 2020-01-01 00:00:08.000 | true      |           8 |
+ 2020-01-01 00:00:09.000 | true      |           9 |
+ 2020-01-01 00:00:10.000 | false     |          10 |
+ 2020-01-01 00:00:11.000 | true      |          11 |
+ 2020-01-01 00:00:12.000 | true      |          12 |
+ 2020-01-01 00:00:13.000 | true      |          13 |
+ 2020-01-01 00:00:14.000 | true      |          14 |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          16 |
+ 2020-01-01 00:00:17.000 | true      |          17 |
+ 2020-01-01 00:00:18.000 | true      |          18 |
+ 2020-01-01 00:00:19.000 | true      |          19 |
+ 2020-01-01 00:00:20.000 | true      |          20 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(null);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | false     |           0 |
+ 2020-01-01 00:00:01.000 | false     |           1 |
+ 2020-01-01 00:00:02.000 | true      | NULL        |
+ 2020-01-01 00:00:03.000 | false     |           3 |
+ 2020-01-01 00:00:04.000 | true      | NULL        |
+ 2020-01-01 00:00:05.000 | true      | NULL        |
+ 2020-01-01 00:00:06.000 | false     |           6 |
+ 2020-01-01 00:00:07.000 | true      | NULL        |
+ 2020-01-01 00:00:08.000 | true      | NULL        |
+ 2020-01-01 00:00:09.000 | true      | NULL        |
+ 2020-01-01 00:00:10.000 | false     |          10 |
+ 2020-01-01 00:00:11.000 | true      | NULL        |
+ 2020-01-01 00:00:12.000 | true      | NULL        |
+ 2020-01-01 00:00:13.000 | true      | NULL        |
+ 2020-01-01 00:00:14.000 | true      | NULL        |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      | NULL        |
+ 2020-01-01 00:00:17.000 | true      | NULL        |
+ 2020-01-01 00:00:18.000 | true      | NULL        |
+ 2020-01-01 00:00:19.000 | true      | NULL        |
+ 2020-01-01 00:00:20.000 | true      | NULL        |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(value, 1);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | false     |           0 |
+ 2020-01-01 00:00:01.000 | false     |           1 |
+ 2020-01-01 00:00:02.000 | true      |           1 |
+ 2020-01-01 00:00:03.000 | false     |           3 |
+ 2020-01-01 00:00:04.000 | true      |           1 |
+ 2020-01-01 00:00:05.000 | true      |           1 |
+ 2020-01-01 00:00:06.000 | false     |           6 |
+ 2020-01-01 00:00:07.000 | true      |           1 |
+ 2020-01-01 00:00:08.000 | true      |           1 |
+ 2020-01-01 00:00:09.000 | true      |           1 |
+ 2020-01-01 00:00:10.000 | false     |          10 |
+ 2020-01-01 00:00:11.000 | true      |           1 |
+ 2020-01-01 00:00:12.000 | true      |           1 |
+ 2020-01-01 00:00:13.000 | true      |           1 |
+ 2020-01-01 00:00:14.000 | true      |           1 |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |           1 |
+ 2020-01-01 00:00:17.000 | true      |           1 |
+ 2020-01-01 00:00:18.000 | true      |           1 |
+ 2020-01-01 00:00:19.000 | true      |           1 |
+ 2020-01-01 00:00:20.000 | true      |           1 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(prev);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | false     |           0 |
+ 2020-01-01 00:00:01.000 | false     |           1 |
+ 2020-01-01 00:00:02.000 | true      |           1 |
+ 2020-01-01 00:00:03.000 | false     |           3 |
+ 2020-01-01 00:00:04.000 | true      |           3 |
+ 2020-01-01 00:00:05.000 | true      |           3 |
+ 2020-01-01 00:00:06.000 | false     |           6 |
+ 2020-01-01 00:00:07.000 | true      |           6 |
+ 2020-01-01 00:00:08.000 | true      |           6 |
+ 2020-01-01 00:00:09.000 | true      |           6 |
+ 2020-01-01 00:00:10.000 | false     |          10 |
+ 2020-01-01 00:00:11.000 | true      |          10 |
+ 2020-01-01 00:00:12.000 | true      |          10 |
+ 2020-01-01 00:00:13.000 | true      |          10 |
+ 2020-01-01 00:00:14.000 | true      |          10 |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          15 |
+ 2020-01-01 00:00:17.000 | true      |          15 |
+ 2020-01-01 00:00:18.000 | true      |          15 |
+ 2020-01-01 00:00:19.000 | true      |          15 |
+ 2020-01-01 00:00:20.000 | true      |          15 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(next);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | false     |           0 |
+ 2020-01-01 00:00:01.000 | false     |           1 |
+ 2020-01-01 00:00:02.000 | true      |           3 |
+ 2020-01-01 00:00:03.000 | false     |           3 |
+ 2020-01-01 00:00:04.000 | true      |           6 |
+ 2020-01-01 00:00:05.000 | true      |           6 |
+ 2020-01-01 00:00:06.000 | false     |           6 |
+ 2020-01-01 00:00:07.000 | true      |          10 |
+ 2020-01-01 00:00:08.000 | true      |          10 |
+ 2020-01-01 00:00:09.000 | true      |          10 |
+ 2020-01-01 00:00:10.000 | false     |          10 |
+ 2020-01-01 00:00:11.000 | true      |          15 |
+ 2020-01-01 00:00:12.000 | true      |          15 |
+ 2020-01-01 00:00:13.000 | true      |          15 |
+ 2020-01-01 00:00:14.000 | true      |          15 |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          21 |
+ 2020-01-01 00:00:17.000 | true      |          21 |
+ 2020-01-01 00:00:18.000 | true      |          21 |
+ 2020-01-01 00:00:19.000 | true      |          21 |
+ 2020-01-01 00:00:20.000 | true      |          21 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(linear);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | false     |           0 |
+ 2020-01-01 00:00:01.000 | false     |           1 |
+ 2020-01-01 00:00:02.000 | true      |           2 |
+ 2020-01-01 00:00:03.000 | false     |           3 |
+ 2020-01-01 00:00:04.000 | true      |           4 |
+ 2020-01-01 00:00:05.000 | true      |           5 |
+ 2020-01-01 00:00:06.000 | false     |           6 |
+ 2020-01-01 00:00:07.000 | true      |           7 |
+ 2020-01-01 00:00:08.000 | true      |           8 |
+ 2020-01-01 00:00:09.000 | true      |           9 |
+ 2020-01-01 00:00:10.000 | false     |          10 |
+ 2020-01-01 00:00:11.000 | true      |          11 |
+ 2020-01-01 00:00:12.000 | true      |          12 |
+ 2020-01-01 00:00:13.000 | true      |          13 |
+ 2020-01-01 00:00:14.000 | true      |          14 |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          16 |
+ 2020-01-01 00:00:17.000 | true      |          17 |
+ 2020-01-01 00:00:18.000 | true      |          18 |
+ 2020-01-01 00:00:19.000 | true      |          19 |
+ 2020-01-01 00:00:20.000 | true      |          20 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:15' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(null);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | true      | NULL        |
+ 2020-01-01 00:00:01.000 | true      | NULL        |
+ 2020-01-01 00:00:02.000 | true      | NULL        |
+ 2020-01-01 00:00:03.000 | true      | NULL        |
+ 2020-01-01 00:00:04.000 | true      | NULL        |
+ 2020-01-01 00:00:05.000 | true      | NULL        |
+ 2020-01-01 00:00:06.000 | true      | NULL        |
+ 2020-01-01 00:00:07.000 | true      | NULL        |
+ 2020-01-01 00:00:08.000 | true      | NULL        |
+ 2020-01-01 00:00:09.000 | true      | NULL        |
+ 2020-01-01 00:00:10.000 | true      | NULL        |
+ 2020-01-01 00:00:11.000 | true      | NULL        |
+ 2020-01-01 00:00:12.000 | true      | NULL        |
+ 2020-01-01 00:00:13.000 | true      | NULL        |
+ 2020-01-01 00:00:14.000 | true      | NULL        |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      | NULL        |
+ 2020-01-01 00:00:17.000 | true      | NULL        |
+ 2020-01-01 00:00:18.000 | true      | NULL        |
+ 2020-01-01 00:00:19.000 | true      | NULL        |
+ 2020-01-01 00:00:20.000 | true      | NULL        |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:15' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(value, 1);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | true      |           1 |
+ 2020-01-01 00:00:01.000 | true      |           1 |
+ 2020-01-01 00:00:02.000 | true      |           1 |
+ 2020-01-01 00:00:03.000 | true      |           1 |
+ 2020-01-01 00:00:04.000 | true      |           1 |
+ 2020-01-01 00:00:05.000 | true      |           1 |
+ 2020-01-01 00:00:06.000 | true      |           1 |
+ 2020-01-01 00:00:07.000 | true      |           1 |
+ 2020-01-01 00:00:08.000 | true      |           1 |
+ 2020-01-01 00:00:09.000 | true      |           1 |
+ 2020-01-01 00:00:10.000 | true      |           1 |
+ 2020-01-01 00:00:11.000 | true      |           1 |
+ 2020-01-01 00:00:12.000 | true      |           1 |
+ 2020-01-01 00:00:13.000 | true      |           1 |
+ 2020-01-01 00:00:14.000 | true      |           1 |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |           1 |
+ 2020-01-01 00:00:17.000 | true      |           1 |
+ 2020-01-01 00:00:18.000 | true      |           1 |
+ 2020-01-01 00:00:19.000 | true      |           1 |
+ 2020-01-01 00:00:20.000 | true      |           1 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:15' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(prev);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          15 |
+ 2020-01-01 00:00:17.000 | true      |          15 |
+ 2020-01-01 00:00:18.000 | true      |          15 |
+ 2020-01-01 00:00:19.000 | true      |          15 |
+ 2020-01-01 00:00:20.000 | true      |          15 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:15' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(next);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | true      |          15 |
+ 2020-01-01 00:00:01.000 | true      |          15 |
+ 2020-01-01 00:00:02.000 | true      |          15 |
+ 2020-01-01 00:00:03.000 | true      |          15 |
+ 2020-01-01 00:00:04.000 | true      |          15 |
+ 2020-01-01 00:00:05.000 | true      |          15 |
+ 2020-01-01 00:00:06.000 | true      |          15 |
+ 2020-01-01 00:00:07.000 | true      |          15 |
+ 2020-01-01 00:00:08.000 | true      |          15 |
+ 2020-01-01 00:00:09.000 | true      |          15 |
+ 2020-01-01 00:00:10.000 | true      |          15 |
+ 2020-01-01 00:00:11.000 | true      |          15 |
+ 2020-01-01 00:00:12.000 | true      |          15 |
+ 2020-01-01 00:00:13.000 | true      |          15 |
+ 2020-01-01 00:00:14.000 | true      |          15 |
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          21 |
+ 2020-01-01 00:00:17.000 | true      |          21 |
+ 2020-01-01 00:00:18.000 | true      |          21 |
+ 2020-01-01 00:00:19.000 | true      |          21 |
+ 2020-01-01 00:00:20.000 | true      |          21 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:15' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(linear);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:15.000 | false     |          15 |
+ 2020-01-01 00:00:16.000 | true      |          16 |
+ 2020-01-01 00:00:17.000 | true      |          17 |
+ 2020-01-01 00:00:18.000 | true      |          18 |
+ 2020-01-01 00:00:19.000 | true      |          19 |
+ 2020-01-01 00:00:20.000 | true      |          20 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:21' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(null);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | true      | NULL        |
+ 2020-01-01 00:00:01.000 | true      | NULL        |
+ 2020-01-01 00:00:02.000 | true      | NULL        |
+ 2020-01-01 00:00:03.000 | true      | NULL        |
+ 2020-01-01 00:00:04.000 | true      | NULL        |
+ 2020-01-01 00:00:05.000 | true      | NULL        |
+ 2020-01-01 00:00:06.000 | true      | NULL        |
+ 2020-01-01 00:00:07.000 | true      | NULL        |
+ 2020-01-01 00:00:08.000 | true      | NULL        |
+ 2020-01-01 00:00:09.000 | true      | NULL        |
+ 2020-01-01 00:00:10.000 | true      | NULL        |
+ 2020-01-01 00:00:11.000 | true      | NULL        |
+ 2020-01-01 00:00:12.000 | true      | NULL        |
+ 2020-01-01 00:00:13.000 | true      | NULL        |
+ 2020-01-01 00:00:14.000 | true      | NULL        |
+ 2020-01-01 00:00:15.000 | true      | NULL        |
+ 2020-01-01 00:00:16.000 | true      | NULL        |
+ 2020-01-01 00:00:17.000 | true      | NULL        |
+ 2020-01-01 00:00:18.000 | true      | NULL        |
+ 2020-01-01 00:00:19.000 | true      | NULL        |
+ 2020-01-01 00:00:20.000 | true      | NULL        |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:21' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(value, 1);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | true      |           1 |
+ 2020-01-01 00:00:01.000 | true      |           1 |
+ 2020-01-01 00:00:02.000 | true      |           1 |
+ 2020-01-01 00:00:03.000 | true      |           1 |
+ 2020-01-01 00:00:04.000 | true      |           1 |
+ 2020-01-01 00:00:05.000 | true      |           1 |
+ 2020-01-01 00:00:06.000 | true      |           1 |
+ 2020-01-01 00:00:07.000 | true      |           1 |
+ 2020-01-01 00:00:08.000 | true      |           1 |
+ 2020-01-01 00:00:09.000 | true      |           1 |
+ 2020-01-01 00:00:10.000 | true      |           1 |
+ 2020-01-01 00:00:11.000 | true      |           1 |
+ 2020-01-01 00:00:12.000 | true      |           1 |
+ 2020-01-01 00:00:13.000 | true      |           1 |
+ 2020-01-01 00:00:14.000 | true      |           1 |
+ 2020-01-01 00:00:15.000 | true      |           1 |
+ 2020-01-01 00:00:16.000 | true      |           1 |
+ 2020-01-01 00:00:17.000 | true      |           1 |
+ 2020-01-01 00:00:18.000 | true      |           1 |
+ 2020-01-01 00:00:19.000 | true      |           1 |
+ 2020-01-01 00:00:20.000 | true      |           1 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:21' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(prev);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:21' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(next);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:00.000 | true      |          21 |
+ 2020-01-01 00:00:01.000 | true      |          21 |
+ 2020-01-01 00:00:02.000 | true      |          21 |
+ 2020-01-01 00:00:03.000 | true      |          21 |
+ 2020-01-01 00:00:04.000 | true      |          21 |
+ 2020-01-01 00:00:05.000 | true      |          21 |
+ 2020-01-01 00:00:06.000 | true      |          21 |
+ 2020-01-01 00:00:07.000 | true      |          21 |
+ 2020-01-01 00:00:08.000 | true      |          21 |
+ 2020-01-01 00:00:09.000 | true      |          21 |
+ 2020-01-01 00:00:10.000 | true      |          21 |
+ 2020-01-01 00:00:11.000 | true      |          21 |
+ 2020-01-01 00:00:12.000 | true      |          21 |
+ 2020-01-01 00:00:13.000 | true      |          21 |
+ 2020-01-01 00:00:14.000 | true      |          21 |
+ 2020-01-01 00:00:15.000 | true      |          21 |
+ 2020-01-01 00:00:16.000 | true      |          21 |
+ 2020-01-01 00:00:17.000 | true      |          21 |
+ 2020-01-01 00:00:18.000 | true      |          21 |
+ 2020-01-01 00:00:19.000 | true      |          21 |
+ 2020-01-01 00:00:20.000 | true      |          21 |
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:21' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(linear);
+         _irowts         | _isfilled | interp(c1)  |
+====================================================
+ 2020-01-01 00:00:21.000 | false     |          21 |
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:22' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(null);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:22' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(value, 1);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:22' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(prev);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:22' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(next);
+
+taos> select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:22' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(linear);
+
diff --git a/tests/army/query/function/in/interp.in b/tests/army/query/function/in/interp.in
index 4825ab46b1..97a9936b8d 100644
--- a/tests/army/query/function/in/interp.in
+++ b/tests/army/query/function/in/interp.in
@@ -13,3 +13,53 @@ select _irowts as irowts ,tbname as table_name, c2 as c_c2, c3 as c_c3, _isfille
 select _irowts as irowts ,tbname as table_name, c2 as c_c2, c3 as c_c3, _isfilled as isfilled , interp(c1) as  intp_c1  from test.td32727 partition by tbname,c2,c3  range('2020-02-01 00:00:04', '2020-02-01 00:00:16')  every(1s) fill (prev) order by irowts, c2, c3;
 select _irowts as irowts ,tbname as table_name, c2 as c_c2, c3 as c_c3, _isfilled as isfilled , interp(c1) as  intp_c1  from test.td32727 partition by tbname,c2,c3  range('2020-02-01 00:00:04', '2020-02-01 00:00:16')  every(1s) fill (linear) order by irowts, c2, c3;
 select _irowts as irowts ,tbname as table_name, c2 as c_c2, c3 as c_c3, _isfilled as isfilled , interp(c1) as  intp_c1  from test.td32727 partition by tbname,c2,c3  range('2020-02-01 00:00:04', '2020-02-01 00:00:16')  every(1s) fill (value, 1) order by irowts, c2, c3;
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-02 00:00:00' and '2020-01-01 00:00:00' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(null);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-02 00:00:00' and '2020-01-01 00:00:00' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(value, 1);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-02 00:00:00' and '2020-01-01 00:00:00' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(prev);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-02 00:00:00' and '2020-01-01 00:00:00' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(next);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-02 00:00:00' and '2020-01-01 00:00:00' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(linear);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-02 00:00:00' range('2020-01-01 00:00:30', '2020-01-01 00:00:00') every(1s) fill(null);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-02 00:00:00' range('2020-01-01 00:00:30', '2020-01-01 00:00:00') every(1s) fill(value, 1);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-02 00:00:00' range('2020-01-01 00:00:30', '2020-01-01 00:00:00') every(1s) fill(prev);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-02 00:00:00' range('2020-01-01 00:00:30', '2020-01-01 00:00:00') every(1s) fill(next);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-02 00:00:00' range('2020-01-01 00:00:30', '2020-01-01 00:00:00') every(1s) fill(linear);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:20' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(null);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:20' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(value, 1);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:20' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(prev);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:20' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(next);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:20' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(linear);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(null);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(value, 1);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(prev);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(next);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:21', '2020-01-01 00:00:30') every(1s) fill(linear);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:15', '2020-01-01 00:00:30') every(1s) fill(null);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:15', '2020-01-01 00:00:30') every(1s) fill(value, 1);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:15', '2020-01-01 00:00:30') every(1s) fill(prev);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:15', '2020-01-01 00:00:30') every(1s) fill(next);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:15', '2020-01-01 00:00:30') every(1s) fill(linear);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(null);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(value, 1);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(prev);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(next);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:21' range('2020-01-01 00:00:00', '2020-01-01 00:00:30') every(1s) fill(linear);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(null);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(value, 1);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(prev);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(next);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:00' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(linear);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:15' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(null);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:15' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(value, 1);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:15' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(prev);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:15' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(next);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:15' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(linear);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:21' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(null);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:21' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(value, 1);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:21' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(prev);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:21' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(next);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:21' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(linear);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:22' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(null);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:22' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(value, 1);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:22' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(prev);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:22' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(next);
+select _irowts, _isfilled, interp(c1) from test.td32861 where ts between '2020-01-01 00:00:22' and '2020-01-01 00:00:30' range('2020-01-01 00:00:00', '2020-01-01 00:00:21') every(1s) fill(linear);
diff --git a/tests/army/query/function/test_interp.py b/tests/army/query/function/test_interp.py
index f903e7be73..106ef1e58e 100644
--- a/tests/army/query/function/test_interp.py
+++ b/tests/army/query/function/test_interp.py
@@ -38,6 +38,7 @@ class TDTestCase(TBase):
                 (ts timestamp, c0 tinyint, c1 smallint, c2 int, c3 bigint, c4 double, c5 float, c6 bool, c7 varchar(10), c8 nchar(10), c9 tinyint unsigned, c10 smallint unsigned, c11 int unsigned, c12 bigint unsigned)
                 '''
         )
+        tdSql.execute("create table if not exists test.td32861(ts timestamp, c1 int);")
 
         tdLog.printNoPrefix("==========step2:insert data")
 
@@ -45,6 +46,16 @@ class TDTestCase(TBase):
         tdSql.execute(f"insert into test.td32727 values ('2020-02-01 00:00:10', 10, 10, 10, 10, 10.0, 10.0, true, 'varchar', 'nchar', 10, 10, 10, 10)")
         tdSql.execute(f"insert into test.td32727 values ('2020-02-01 00:00:15', 15, 15, 15, 15, 15.0, 15.0, true, 'varchar', 'nchar', 15, 15, 15, 15)")
 
+        tdSql.execute(
+            """insert into test.td32861 values
+                ('2020-01-01 00:00:00', 0),
+                ('2020-01-01 00:00:01', 1),
+                ('2020-01-01 00:00:03', 3),
+                ('2020-01-01 00:00:06', 6),
+                ('2020-01-01 00:00:10', 10),
+                ('2020-01-01 00:00:15', 15),
+                ('2020-01-01 00:00:21', 21);"""
+        )
 
     def test_normal_query_new(self, testCase):
         # read sql from .sql file and execute