diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index bda3afe538..41c3574954 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -48,9 +48,9 @@ typedef struct SMapData     SMapData;
 typedef struct SBlockSMA    SBlockSMA;
 typedef struct SBlockIdx    SBlockIdx;
 typedef struct SBlock       SBlock;
-typedef struct SBlockCol    SBlockCol;
 typedef struct SBlockStatis SBlockStatis;
 typedef struct SAggrBlkCol  SAggrBlkCol;
+typedef struct SColData     SColData;
 typedef struct SBlockData   SBlockData;
 typedef struct SReadH       SReadH;
 
@@ -305,14 +305,6 @@ struct SBlock {
   SSubBlock sBlocks[TSDB_MAX_SUBBLOCKS];
 };
 
-struct SBlockCol {
-  int16_t  colId;
-  uint16_t type : 6;
-  uint16_t blen : 10;  // 0 no bitmap if all rows are NORM, > 0 bitmap length
-  uint32_t len;        // data length + bitmap length
-  uint32_t offset;
-};
-
 struct SAggrBlkCol {
   int16_t colId;
   int16_t maxIndex;
@@ -323,12 +315,20 @@ struct SAggrBlkCol {
   int64_t min;
 };
 
-struct SBlockData {
-  int32_t   nRow;
-  SBlockCol cols[];
+struct SColData {
+  int16_t  cid;
+  int8_t   type;
+  int32_t  bytes;
+  uint8_t  flags;
+  uint8_t *pBitMap;
+  uint32_t nData;
+  uint8_t *pData;
 };
 
-typedef void SAggrBlkData;  // SBlockCol cols[];
+struct SBlockData {
+  int32_t nRow;
+  SArray *aColData;
+};
 
 // ================== TSDB global config
 extern bool tsdbForceKeepFile;
diff --git a/source/dnode/vnode/src/inc/vnodeInt.h b/source/dnode/vnode/src/inc/vnodeInt.h
index 8ba4b04e3f..9286063fb6 100644
--- a/source/dnode/vnode/src/inc/vnodeInt.h
+++ b/source/dnode/vnode/src/inc/vnodeInt.h
@@ -258,7 +258,7 @@ struct SSma {
 
 #define SMA_CFG(s)        (&(s)->pVnode->config)
 #define SMA_TSDB_CFG(s)   (&(s)->pVnode->config.tsdbCfg)
-#define SMA_RETENTION(s)  ((SRetention *)&(s)->pVnode->config.tsdbCfg.retentions)
+#define SMA_RETENTION(s)  ((SRetention*)&(s)->pVnode->config.tsdbCfg.retentions)
 #define SMA_LOCKED(s)     ((s)->locked)
 #define SMA_META(s)       ((s)->pVnode->pMeta)
 #define SMA_VID(s)        TD_VID((s)->pVnode)
diff --git a/source/dnode/vnode/src/tsdb/tsdbUtil.c b/source/dnode/vnode/src/tsdb/tsdbUtil.c
index 931f5f9a76..cfe5259971 100644
--- a/source/dnode/vnode/src/tsdb/tsdbUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbUtil.c
@@ -164,7 +164,7 @@ int32_t tsdbRealloc(uint8_t **ppBuf, int64_t size) {
 
   if (bsize >= size) goto _exit;
 
-  if (bsize == 0) bsize = 128;
+  if (bsize == 0) bsize = 16;
   while (bsize < size) {
     bsize *= 2;
   }
@@ -543,4 +543,6 @@ int32_t tGetKEYINFO(uint8_t *p, KEYINFO *pKeyInfo) {
   n += tGetI64v(p + n, &pKeyInfo->maxVersion);
 
   return n;
-}
\ No newline at end of file
+}
+
+// SBlockData ======================================================
\ No newline at end of file