fix(query): fix interp + fill interpolation behavior

TD-18173
TD-18174

source/libs/executor/src/timewindowoperator.c

@@ -2234,7 +2234,7 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
 
   blockDataCleanup(pResBlock);
 
-  int32_t numOfRows = 0;
+  //int32_t numOfRows = 0;
   while (1) {
     SSDataBlock* pBlock = downstream->fpSet.getNextFn(downstream);
     if (pBlock == NULL) {
@@ -2263,7 +2263,8 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
           SColumnInfoData* pDst = taosArrayGet(pResBlock->pDataBlock, dstSlot);
 
           char* v = colDataGetData(pSrc, i);
-          colDataAppend(pDst, numOfRows, v, false);
+          //colDataAppend(pDst, numOfRows, v, false);
+          colDataAppend(pDst, pResBlock->info.rows, v, false);
         }
 
         pResBlock->info.rows += 1;
@@ -2312,12 +2313,47 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
           }
         }
 
+        // add current row if timestamp match
+        if (ts == pSliceInfo->current && pSliceInfo->current <= pSliceInfo->win.ekey) {
+          for (int32_t j = 0; j < pOperator->exprSupp.numOfExprs; ++j) {
+            SExprInfo* pExprInfo = &pOperator->exprSupp.pExprInfo[j];
+            int32_t    dstSlot = pExprInfo->base.resSchema.slotId;
+            int32_t    srcSlot = pExprInfo->base.pParam[0].pCol->slotId;
+
+            SColumnInfoData* pSrc = taosArrayGet(pBlock->pDataBlock, srcSlot);
+            SColumnInfoData* pDst = taosArrayGet(pResBlock->pDataBlock, dstSlot);
+
+            char* v = colDataGetData(pSrc, i);
+            colDataAppend(pDst, pResBlock->info.rows, v, false);
+          }
+
+          pResBlock->info.rows += 1;
+          doKeepPrevRows(pSliceInfo, pBlock, i);
+
+          pSliceInfo->current =
+              taosTimeAdd(pSliceInfo->current, pInterval->interval, pInterval->intervalUnit, pInterval->precision);
+
+          if (pResBlock->info.rows >= pResBlock->info.capacity) {
+            break;
+          }
+        }
+
         if (pSliceInfo->current > pSliceInfo->win.ekey) {
           doSetOperatorCompleted(pOperator);
           break;
         }
       }
     }
+
+    //check if need to interpolate after ts range
+    while (pSliceInfo->current <= pSliceInfo->win.ekey) {
+      genInterpolationResult(pSliceInfo, &pOperator->exprSupp, pBlock, pBlock->info.rows - 1, pResBlock);
+      pSliceInfo->current =
+          taosTimeAdd(pSliceInfo->current, pInterval->interval, pInterval->intervalUnit, pInterval->precision);
+      if (pResBlock->info.rows >= pResBlock->info.capacity) {
+        break;
+      }
+    }
   }
 
   // restore the value