diff --git a/source/libs/executor/src/timewindowoperator.c b/source/libs/executor/src/timewindowoperator.c
index ebfbacaa9e..287d80759e 100644
--- a/source/libs/executor/src/timewindowoperator.c
+++ b/source/libs/executor/src/timewindowoperator.c
@@ -2325,9 +2325,6 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
           genInterpolationResult(pSliceInfo, &pOperator->exprSupp, pResBlock);
           pSliceInfo->current =
               taosTimeAdd(pSliceInfo->current, pInterval->interval, pInterval->intervalUnit, pInterval->precision);
-          if (pResBlock->info.rows >= pResBlock->info.capacity) {
-            break;
-          }
         }
       }
 
@@ -2337,6 +2334,7 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
       }
 
       if (ts == pSliceInfo->current) {
+        blockDataEnsureCapacity(pResBlock, pResBlock->info.rows + 1);
         for (int32_t j = 0; j < pOperator->exprSupp.numOfExprs; ++j) {
           SExprInfo* pExprInfo = &pOperator->exprSupp.pExprInfo[j];
 
@@ -2377,9 +2375,6 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
                 genInterpolationResult(pSliceInfo, &pOperator->exprSupp, pResBlock);
                 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) {
@@ -2398,10 +2393,6 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
             doSetOperatorCompleted(pOperator);
             break;
           }
-
-          if (pResBlock->info.rows >= pResBlock->info.capacity) {
-            break;
-          }
         }
       } else if (ts < pSliceInfo->current) {
         // in case of interpolation window starts and ends between two datapoints, fill(prev) need to interpolate
@@ -2419,9 +2410,6 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
                 genInterpolationResult(pSliceInfo, &pOperator->exprSupp, pResBlock);
                 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) {
@@ -2443,9 +2431,6 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
                 genInterpolationResult(pSliceInfo, &pOperator->exprSupp, pResBlock);
                 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) {
@@ -2467,13 +2452,11 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
           genInterpolationResult(pSliceInfo, &pOperator->exprSupp, pResBlock);
           pSliceInfo->current =
               taosTimeAdd(pSliceInfo->current, pInterval->interval, pInterval->intervalUnit, pInterval->precision);
-          if (pResBlock->info.rows >= pResBlock->info.capacity) {
-            break;
-          }
         }
 
         // add current row if timestamp match
         if (ts == pSliceInfo->current && pSliceInfo->current <= pSliceInfo->win.ekey) {
+          blockDataEnsureCapacity(pResBlock, pResBlock->info.rows + 1);
           for (int32_t j = 0; j < pOperator->exprSupp.numOfExprs; ++j) {
             SExprInfo* pExprInfo = &pOperator->exprSupp.pExprInfo[j];
 
@@ -2510,9 +2493,6 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
                   genInterpolationResult(pSliceInfo, &pOperator->exprSupp, pResBlock);
                   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) {
@@ -2528,9 +2508,6 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
             pSliceInfo->current =
                 taosTimeAdd(pSliceInfo->current, pInterval->interval, pInterval->intervalUnit, pInterval->precision);
 
-            if (pResBlock->info.rows >= pResBlock->info.capacity) {
-              break;
-            }
           }
         }
 
@@ -2549,9 +2526,6 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
     genInterpolationResult(pSliceInfo, &pOperator->exprSupp, pResBlock);
     pSliceInfo->current =
         taosTimeAdd(pSliceInfo->current, pInterval->interval, pInterval->intervalUnit, pInterval->precision);
-    if (pResBlock->info.rows >= pResBlock->info.capacity) {
-      break;
-    }
   }
 
   // restore the value