diff --git a/source/dnode/vnode/src/tsdb/tsdbUtil.c b/source/dnode/vnode/src/tsdb/tsdbUtil.c
index 32fc7b82a1f0200bea76ea40998b052c921d1593..64c150484b4f873bd15fb69c2b238bd840e1ea1f 100644
--- a/source/dnode/vnode/src/tsdb/tsdbUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbUtil.c
@@ -1744,47 +1744,16 @@ int32_t tsdbCmprColData(SColData *pColData, int8_t cmprAlg, SBlockCol *pBlockCol
   int32_t size = 0;
   // bitmap
   if (pColData->flag != HAS_VALUE) {
-    uint8_t *pBitMap = pColData->pBitMap;
-    int32_t  szBitMap = BIT2_SIZE(pColData->nVal);
-
-    // BIT2 to BIT1
-    if (pColData->flag != (HAS_VALUE | HAS_NULL | HAS_NONE)) {
+    int32_t szBitMap;
+    if (pColData->flag == (HAS_VALUE | HAS_NULL | HAS_NONE)) {
+      szBitMap = BIT2_SIZE(pColData->nVal);
+    } else {
       szBitMap = BIT1_SIZE(pColData->nVal);
-      pBitMap = taosMemoryCalloc(1, szBitMap);
-      if (pBitMap == NULL) {
-        code = TSDB_CODE_OUT_OF_MEMORY;
-        goto _exit;
-      }
-
-      for (int32_t iVal = 0; iVal < pColData->nVal; iVal++) {
-        uint8_t v = GET_BIT2(pColData->pBitMap, iVal);
-        switch (pColData->flag) {
-          case (HAS_NULL | HAS_NONE):
-            SET_BIT1(pBitMap, iVal, v);
-            break;
-          case (HAS_VALUE | HAS_NONE):
-            if (v) {
-              SET_BIT1(pBitMap, iVal, 1);
-            } else {
-              SET_BIT1(pBitMap, iVal, 0);
-            }
-            break;
-          case (HAS_VALUE | HAS_NULL):
-            SET_BIT1(pBitMap, iVal, v - 1);
-            break;
-          default:
-            ASSERT(0);
-        }
-      }
     }
 
-    code = tsdbCmprData(pBitMap, szBitMap, TSDB_DATA_TYPE_TINYINT, cmprAlg, ppOut, nOut + size, &pBlockCol->szBitmap,
-                        ppBuf);
+    code = tsdbCmprData(pColData->pBitMap, szBitMap, TSDB_DATA_TYPE_TINYINT, cmprAlg, ppOut, nOut + size,
+                        &pBlockCol->szBitmap, ppBuf);
     if (code) goto _exit;
-
-    if (pColData->flag != (HAS_VALUE | HAS_NULL | HAS_NONE)) {
-      taosMemoryFree(pBitMap);
-    }
   }
   size += pBlockCol->szBitmap;
 
@@ -1822,46 +1791,15 @@ int32_t tsdbDecmprColData(uint8_t *pIn, SBlockCol *pBlockCol, int8_t cmprAlg, in
   uint8_t *p = pIn;
   // bitmap
   if (pBlockCol->szBitmap) {
-    if (pBlockCol->flag != (HAS_VALUE | HAS_NULL | HAS_NONE)) {
-      uint8_t *pBitMap = NULL;
-      code = tsdbDecmprData(p, pBlockCol->szBitmap, TSDB_DATA_TYPE_TINYINT, cmprAlg, &pBitMap,
-                            BIT1_SIZE(pColData->nVal), ppBuf);
-      if (code) goto _exit;
-
-      code = tRealloc(&pColData->pBitMap, BIT2_SIZE(pColData->nVal));
-      if (code) {
-        tFree(pBitMap);
-        goto _exit;
-      }
-
-      // BIT1 to BIT2
-      for (int32_t iVal = 0; iVal < nVal; iVal++) {
-        uint8_t v = GET_BIT1(pBitMap, iVal);
-        switch (pBlockCol->flag) {
-          case (HAS_NULL | HAS_NONE):
-            SET_BIT2(pColData->pBitMap, iVal, v);
-            break;
-          case (HAS_VALUE | HAS_NONE):
-            if (v) {
-              SET_BIT2(pColData->pBitMap, iVal, 2);
-            } else {
-              SET_BIT2(pColData->pBitMap, iVal, 0);
-            }
-            break;
-          case (HAS_VALUE | HAS_NULL):
-            SET_BIT2(pColData->pBitMap, iVal, v + 1);
-            break;
-          default:
-            ASSERT(0);
-        }
-      }
-
-      tFree(pBitMap);
+    int32_t szBitMap;
+    if (pColData->flag == (HAS_VALUE | HAS_NULL | HAS_NONE)) {
+      szBitMap = BIT2_SIZE(pColData->nVal);
     } else {
-      code = tsdbDecmprData(p, pBlockCol->szBitmap, TSDB_DATA_TYPE_TINYINT, cmprAlg, &pColData->pBitMap,
-                            BIT2_SIZE(pColData->nVal), ppBuf);
-      if (code) goto _exit;
+      szBitMap = BIT1_SIZE(pColData->nVal);
     }
+
+    code = tsdbDecmprData(p, pBlockCol->szBitmap, TSDB_DATA_TYPE_TINYINT, cmprAlg, &pColData->pBitMap, szBitMap, ppBuf);
+    if (code) goto _exit;
   }
   p += pBlockCol->szBitmap;