diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index 92f02d9ed084249f2843df02c27afae7d6531fd1..cb3509e983d77df8b3bc19971e83bb499ce204ed 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -63,6 +63,8 @@ typedef struct SDataFWriter   SDataFWriter;
 typedef struct SDataFReader   SDataFReader;
 typedef struct SDelFWriter    SDelFWriter;
 typedef struct SDelFReader    SDelFReader;
+typedef struct SRowIter       SRowIter;
+typedef struct STsdbFS        STsdbFS;
 
 #define TSDB_MAX_SUBBLOCKS 8
 
@@ -78,6 +80,9 @@ TSDBKEY tsdbRowKey(TSDBROW *pRow);
 void    tsdbRowGetColVal(TSDBROW *pRow, STSchema *pTSchema, int32_t iCol, SColVal *pColVal);
 int32_t tPutTSDBRow(uint8_t *p, TSDBROW *pRow);
 int32_t tGetTSDBRow(uint8_t *p, TSDBROW *pRow);
+// SRowIter
+#define tRowIterInit(ROW, SCHEMA) ((SRowIter){.pRow = (ROW), .pSchema = (SCHEMA)})
+SColVal *tRowIterNext(SRowIter *pIter);
 // TABLEID
 int32_t tTABLEIDCmprFn(const void *p1, const void *p2);
 // TSDBKEY
@@ -107,11 +112,11 @@ int32_t tGetBlockIdx(uint8_t *p, void *ph);
 // SColdata
 #define tColDataInit() ((SColData){0})
 void    tColDataReset(SColData *pColData);
-void    tColDataClear(SColData *pColData);
+void    tColDataClear(void *ph);
 int32_t tColDataAppendValue(SColData *pColData, SColVal *pColVal);
 int32_t tColDataCmprFn(const void *p1, const void *p2);
 // SBlockData
-#define tBlockDataInit() ((SBlockData){0})
+int32_t tBlockDataInit(SBlockData *pBlockData);
 void    tBlockDataReset(SBlockData *pBlockData);
 void    tBlockDataClear(SBlockData *pBlockData);
 int32_t tBlockDataAppendRow(SBlockData *pBlockData, TSDBROW *pRow, STSchema *pTSchema);
@@ -160,14 +165,15 @@ void tsdbLastFileName(STsdb *pTsdb, SLastFile *pFile, char fname[]);
 // SSmaFile
 void tsdbSmaFileName(STsdb *pTsdb, SSmaFile *pFile, char fname[]);
 // SDelFile
-#define tsdbDelFileCreate() ((SDelFile){.info = KEYINFO_INIT_VAL, .size = 0, .offset = 0})
+#define tsdbDelFileCreate() \
+  ((SDelFile){              \
+      .maxKey = TSKEY_MIN, .minKey = TSKEY_MAX, .maxVersion = -1, .minVersion = INT64_MAX, .size = 0, .offset = 0})
 void tsdbDelFileName(STsdb *pTsdb, SDelFile *pFile, char fname[]);
 // tsdbFS.c ==============================================================================================
-typedef struct STsdbFS STsdbFS;
-int32_t                tsdbFSOpen(STsdb *pTsdb, STsdbFS **ppFS);
-int32_t                tsdbFSClose(STsdbFS *pFS);
-int32_t                tsdbFSStart(STsdbFS *pFS);
-int32_t                tsdbFSEnd(STsdbFS *pFS, int8_t rollback);
+int32_t tsdbFSOpen(STsdb *pTsdb, STsdbFS **ppFS);
+int32_t tsdbFSClose(STsdbFS *pFS);
+int32_t tsdbFSStart(STsdbFS *pFS);
+int32_t tsdbFSEnd(STsdbFS *pFS, int8_t rollback);
 // tsdbReaderWriter.c ==============================================================================================
 // SDataFWriter
 int32_t tsdbDataFWriterOpen(SDataFWriter **ppWriter, STsdb *pTsdb, SDFileSet *pSet);
@@ -200,7 +206,7 @@ int32_t tsdbReadDelIdx(SDelFReader *pReader, SMapData *pDelIdxMap, uint8_t **ppB
 
 // tsdbCache
 int32_t tsdbOpenCache(STsdb *pTsdb);
-void tsdbCloseCache(SLRUCache *pCache);
+void    tsdbCloseCache(SLRUCache *pCache);
 int32_t tsdbCacheInsertLastrow(SLRUCache *pCache, tb_uid_t uid, STSRow *row);
 int32_t tsdbCacheGetLastrow(SLRUCache *pCache, tb_uid_t uid, STSRow **ppRow);
 int32_t tsdbCacheDeleteLastrow(SLRUCache *pCache, tb_uid_t uid);
@@ -366,14 +372,12 @@ struct SColData {
 };
 
 struct SBlockData {
-  int32_t    maxRow;
-  int32_t    nRow;
-  int64_t   *aVersion;
-  TSKEY     *aTSKEY;
-  int32_t    maxCol;
-  int32_t    nColData;
-  SColData **apColData;
-  SColData  *aColData;
+  int32_t  maxRow;
+  int32_t  nRow;
+  int64_t *aVersion;
+  TSKEY   *aTSKEY;
+  SArray  *apColData;
+  SArray  *aColData;
 };
 
 // ================== TSDB global config
@@ -414,7 +418,10 @@ struct SDelIdx {
 };
 
 struct SDelFile {
-  KEYINFO info;
+  TSKEY   minKey;
+  TSKEY   maxKey;
+  int64_t minVersion;
+  int64_t maxVersion;
   int64_t size;
   int64_t offset;
 };
@@ -463,11 +470,19 @@ struct SSmaFile {
 
 struct SDFileSet {
   SDiskID    diskId;
-  int32_t    nRef;
+  int32_t    fid;
   SHeadFile *pHeadFile;
   SDataFile *pDataFile;
   SLastFile *pLastFile;
   SSmaFile  *pSmaFile;
+  int32_t    nRef;
+};
+
+struct SRowIter {
+  TSDBROW  *pRow;
+  STSchema *pSchema;
+  SColVal   colVal;
+  int32_t   i;
 };
 
 #ifdef __cplusplus
diff --git a/source/dnode/vnode/src/tsdb/tsdbFS.c b/source/dnode/vnode/src/tsdb/tsdbFS.c
index f5b89769359fa3abb7120d86c8ba88bafdbef5b3..04041f1dd10a854b9988a125999ad3a34965d74d 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFS.c
+++ b/source/dnode/vnode/src/tsdb/tsdbFS.c
@@ -15,25 +15,364 @@
 
 #include "tsdb.h"
 
+typedef struct {
+  SDelFile *pDelFile;
+  SArray   *aDFileSet;  // SArray<aDFileSet>
+} STsdbFSState;
+
 struct STsdbFS {
-  STsdb          *pTsdb;
-  TdThreadRwlock  lock;
-  int64_t         minVersion;
-  int64_t         maxVersion;
-  SDelFile       *pTombstoneF;
-  STsdbCacheFile *pCacheF;
-  SArray         *pArray;
+  STsdb         *pTsdb;
+  TdThreadRwlock lock;
+  int8_t         inTxn;
+  STsdbFSState  *cState;
+  STsdbFSState  *nState;
 };
 
-int32_t tsdbFSOpen(STsdb *pTsdb, STsdbFS **ppFS) {
+// =================================================================================================
+static int32_t tsdbDelFileToJson(const void *pObj, SJson *pJson) {
+  int32_t   code = 0;
+  SDelFile *pDelFile = (SDelFile *)pObj;
+
+  if (tjsonAddIntegerToObject(pJson, "minKey", pDelFile->minKey) < 0) goto _err;
+  if (tjsonAddIntegerToObject(pJson, "maxKey", pDelFile->maxKey) < 0) goto _err;
+  if (tjsonAddIntegerToObject(pJson, "minVer", pDelFile->minVersion) < 0) goto _err;
+  if (tjsonAddIntegerToObject(pJson, "maxVer", pDelFile->maxVersion) < 0) goto _err;
+
+  return code;
+
+_err:
+  code = TSDB_CODE_OUT_OF_MEMORY;
+  return code;
+}
+
+static int32_t tsdbHeadFileToJson(const void *pObj, SJson *pJson) {
+  int32_t    code = 0;
+  SHeadFile *pHeadFile = (SHeadFile *)pObj;
+
+  if (tjsonAddIntegerToObject(pJson, "size", pHeadFile->size) < 0) goto _err;
+  if (tjsonAddIntegerToObject(pJson, "offset", pHeadFile->offset) < 0) goto _err;
+
+  return code;
+
+_err:
+  code = TSDB_CODE_OUT_OF_MEMORY;
+  return code;
+}
+
+static int32_t tsdbDataFileToJson(const void *pObj, SJson *pJson) {
+  int32_t    code = 0;
+  SDataFile *pDataFile = (SDataFile *)pObj;
+
+  if (tjsonAddIntegerToObject(pJson, "size", pDataFile->size) < 0) goto _err;
+
+  return code;
+
+_err:
+  code = TSDB_CODE_OUT_OF_MEMORY;
+  return code;
+}
+
+static int32_t tsdbLastFileToJson(const void *pObj, SJson *pJson) {
+  int32_t    code = 0;
+  SLastFile *pLastFile = (SLastFile *)pObj;
+
+  if (tjsonAddIntegerToObject(pJson, "size", pLastFile->size) < 0) goto _err;
+
+  return code;
+
+_err:
+  code = TSDB_CODE_OUT_OF_MEMORY;
+  return code;
+}
+
+static int32_t tsdbSmaFileToJson(const void *pObj, SJson *pJson) {
+  int32_t   code = 0;
+  SSmaFile *pSmaFile = (SSmaFile *)pObj;
+
+  if (tjsonAddIntegerToObject(pJson, "size", pSmaFile->size) < 0) goto _err;
+
+  return code;
+
+_err:
+  code = TSDB_CODE_OUT_OF_MEMORY;
+  return code;
+}
+
+static int32_t tsdbDFileSetToJson(const void *pObj, SJson *pJson) {
+  int32_t    code = 0;
+  SDFileSet *pDFileSet = (SDFileSet *)pObj;
+
+  if (tjsonAddIntegerToObject(pJson, "level", pDFileSet->diskId.level) < 0) goto _err;
+  if (tjsonAddIntegerToObject(pJson, "id", pDFileSet->diskId.id) < 0) goto _err;
+  if (tjsonAddIntegerToObject(pJson, "fid", pDFileSet->fid) < 0) goto _err;
+  if (tjsonAddObject(pJson, "head", tsdbHeadFileToJson, pDFileSet->pHeadFile) < 0) goto _err;
+  if (tjsonAddObject(pJson, "data", tsdbDataFileToJson, pDFileSet->pDataFile) < 0) goto _err;
+  if (tjsonAddObject(pJson, "last", tsdbLastFileToJson, pDFileSet->pLastFile) < 0) goto _err;
+  if (tjsonAddObject(pJson, "sma", tsdbSmaFileToJson, pDFileSet->pSmaFile) < 0) goto _err;
+
+  return code;
+
+_err:
+  code = TSDB_CODE_OUT_OF_MEMORY;
+  return code;
+}
+
+static int32_t tsdbFSStateToJsonStr(STsdbFSState *pState, char **ppData) {
+  int32_t code = 0;
+  SJson  *pJson = NULL;
+
+  pJson = tjsonCreateObject();
+  if (pJson == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _err;
+  }
+
+  if (tjsonAddObject(pJson, "DelFile", tsdbDelFileToJson, pState->pDelFile) < 0) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _err;
+  }
+
+  if (tjsonAddTArray(pJson, "DFileSet", tsdbDFileSetToJson, pState->aDFileSet) < 0) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _err;
+  }
+
+  *ppData = tjsonToString(pJson);
+  if (*ppData == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _err;
+  }
+
+  tjsonDelete(pJson);
+
+  return code;
+
+_err:
+  return code;
+}
+
+static int32_t tsdbJsonStrToFSState(char *pData, STsdbFSState *pState) {
+  int32_t code = 0;
+  SJson  *pJson = NULL;
+
+  pJson = tjsonParse(pData);
+  if (pJson == NULL) goto _err;
+
+  // if (tjsonToObject(pJson, "DelFile", tsdbJsonToDelFile, &pState->pDelFile) < 0) goto _err;
+  // if (tjsonToTArray(pJson, "DFIleSet", tsdbJsonToDFileSet, ) < 0) goto _err;
+  ASSERT(0);
+
+  tjsonDelete(pJson);
+
+  return code;
+
+_err:
+  code = TSDB_CODE_OUT_OF_MEMORY;
+  return code;
+}
+
+static int32_t tsdbCreateEmptyCurrent(const char *fname, STsdbFSState *pState) {
+  int32_t   code = 0;
+  int64_t   n;
+  int64_t   size;
+  char     *pData = NULL;
+  TdFilePtr pFD = NULL;
+
+  // to json str
+  code = tsdbFSStateToJsonStr(pState, &pData);
+  if (code) goto _err;
+
+  // create and write
+  pFD = taosOpenFile(fname, TD_FILE_WRITE | TD_FILE_CREATE);
+  if (pFD == NULL) {
+    code = TAOS_SYSTEM_ERROR(errno);
+    goto _err;
+  }
+
+  size = strlen(pData);
+  n = taosWriteFile(pFD, pData, size);
+  if (n < 0) {
+    code = TAOS_SYSTEM_ERROR(errno);
+    goto _err;
+  }
+
+  if (taosFsyncFile(pFD) < 0) {
+    code = TAOS_SYSTEM_ERROR(errno);
+    goto _err;
+  }
+
+  taosCloseFile(&pFD);
+
+  if (pData) taosMemoryFree(pData);
+  return code;
+
+_err:
+  tsdbError("create empry current failed since %s", tstrerror(code));
+  if (pData) taosMemoryFree(pData);
+  return code;
+}
+
+static int32_t tsdbLoadCurrentState(STsdbFS *pFS, STsdbFSState *pState) {
+  int32_t   code = 0;
+  int64_t   size;
+  int64_t   n;
+  char      fname[TSDB_FILENAME_LEN];
+  char     *pData = NULL;
+  TdFilePtr pFD;
+
+  snprintf(fname, TSDB_FILENAME_LEN - 1, "%s/CURRENT", pFS->pTsdb->path);
+
+  if (!taosCheckExistFile(fname)) {
+    // create an empry CURRENT file if not exists
+    code = tsdbCreateEmptyCurrent(fname, pState);
+    if (code) goto _err;
+  } else {
+    // open the file and load
+    pFD = taosOpenFile(fname, TD_FILE_READ);
+    if (pFD == NULL) {
+      code = TAOS_SYSTEM_ERROR(errno);
+      goto _err;
+    }
+
+    if (taosFStatFile(pFD, &size, NULL) < 0) {
+      code = TAOS_SYSTEM_ERROR(errno);
+      goto _err;
+    }
+
+    pData = taosMemoryMalloc(size + 1);
+    if (pData == NULL) {
+      code = TSDB_CODE_OUT_OF_MEMORY;
+      goto _err;
+    }
+    pData[size] = '\0';
+
+    n = taosReadFile(pFD, pData, size);
+    if (n < 0) {
+      code = TAOS_SYSTEM_ERROR(errno);
+      goto _err;
+    }
+
+    taosCloseFile(&pFD);
+
+    // decode
+    code = tsdbJsonStrToFSState(pData, pState);
+    if (code) goto _err;
+  }
+
+  if (pData) taosMemoryFree(pData);
+  return code;
+
+_err:
+  tsdbError("vgId:%d tsdb load current state failed since %s", TD_VID(pFS->pTsdb->pVnode), tstrerror(code));
+  if (pData) taosMemoryFree(pData);
+  return code;
+}
+
+static int32_t tsdbFSOpenImpl(STsdbFS *pFS) {
+  int32_t code = 0;
+  int64_t size;
+  int64_t n;
+
+  // read CURRENT file
+  code = tsdbLoadCurrentState(pFS, pFS->cState);
+  if (code) goto _err;
+
+  // decode the statue file
+  // code = tsdbDecodeFSState(pData, pFS->cState);
+  // if (code) goto _err;
+
+  // // scan and fix invalid tsdb FS
+  // code = tsdbScanAndFixFS(pFS);
+  // if (code) goto _err;
+
+  // if (pData) taosMemoryFree(pData);
+  return code;
+
+_err:
+  // if (pData) taosMemoryFree(pData);
+  tsdbError("vgId:%d tsdb fs open impl failed since %s", TD_VID(pFS->pTsdb->pVnode), tstrerror(code));
+  return code;
+}
+
+int32_t tsdbFSCloseImpl(STsdbFS *pFS) {
   int32_t code = 0;
   // TODO
   return code;
 }
 
+// EXPOSED APIS ====================================================================================
+int32_t tsdbFSOpen(STsdb *pTsdb, STsdbFS **ppFS) {
+  int32_t  code = 0;
+  STsdbFS *pFS = NULL;
+
+  pFS = (STsdbFS *)taosMemoryCalloc(1, sizeof(*pFS));
+  if (pFS == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _err;
+  }
+  pFS->pTsdb = pTsdb;
+
+  code = taosThreadRwlockInit(&pFS->lock, NULL);
+  if (code) {
+    code = TAOS_SYSTEM_ERROR(code);
+    goto _err;
+  }
+
+  pFS->inTxn = 0;
+
+  pFS->cState = (STsdbFSState *)taosMemoryCalloc(1, sizeof(STsdbFSState));
+  if (pFS->cState == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _err;
+  }
+  pFS->cState->aDFileSet = taosArrayInit(0, sizeof(SDFileSet));
+  if (pFS->cState->aDFileSet == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _err;
+  }
+
+  pFS->nState = (STsdbFSState *)taosMemoryCalloc(1, sizeof(STsdbFSState));
+  if (pFS->nState == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _err;
+  }
+  pFS->nState->aDFileSet = taosArrayInit(0, sizeof(SDFileSet));
+  if (pFS->nState->aDFileSet == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _err;
+  }
+
+  code = tsdbFSOpenImpl(pFS);
+  if (code) goto _err;
+
+  *ppFS = pFS;
+  return code;
+
+_err:
+  *ppFS = NULL;
+  tsdbError("vgId:%d tsdb fs open failed since %s", TD_VID(pTsdb->pVnode), tstrerror(code));
+  return code;
+}
+
 int32_t tsdbFSClose(STsdbFS *pFS) {
   int32_t code = 0;
-  // TODO
+
+  if (pFS) {
+    code = tsdbFSCloseImpl(pFS);
+    if (code) goto _err;
+
+    taosArrayDestroy(pFS->nState->aDFileSet);
+    taosMemoryFree(pFS->nState);
+    taosArrayDestroy(pFS->cState->aDFileSet);
+    taosMemoryFree(pFS->cState);
+    taosThreadRwlockDestroy(&pFS->lock);
+    taosMemoryFree(pFS);
+  }
+
+  return code;
+
+_err:
+  tsdbError("vgId:%d tsdb fs close failed since %s", TD_VID(pFS->pTsdb->pVnode), tstrerror(code));
   return code;
 }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
index bb5b8769c18a7461c5102d994765ea50464fec71..f68771633b35876df41d05a1497fdb5164abc67d 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
@@ -922,8 +922,8 @@ int32_t tsdbWriteBlockData(SDataFWriter *pWriter, SBlockData *pBlockData, uint8_
   // other columns
   offset = 0;
   tMapDataClear(&pSubBlock->mBlockCol);
-  for (int32_t iCol = 0; iCol < pBlockData->nColData; iCol++) {
-    SColData *pColData = &pBlockData->aColData[iCol];
+  for (int32_t iCol = 0; iCol < taosArrayGetSize(pBlockData->apColData); iCol++) {
+    SColData *pColData = (SColData *)taosArrayGetP(pBlockData->apColData, iCol);
 
     ASSERT(pColData->flags);
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbUtil.c b/source/dnode/vnode/src/tsdb/tsdbUtil.c
index 5df0773ca43def878b95d0eb568fad317c85cc9d..cbc8c9424545e232c8fbc4b37859b30e558ce1e4 100644
--- a/source/dnode/vnode/src/tsdb/tsdbUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbUtil.c
@@ -445,7 +445,10 @@ int32_t tGetDelData(uint8_t *p, void *ph) {
 int32_t tPutDelFileHdr(uint8_t *p, SDelFile *pDelFile) {
   int32_t n = 0;
 
-  n += tPutKEYINFO(p ? p + n : p, &pDelFile->info);
+  n += tPutI64(p ? p + n : p, pDelFile->minKey);
+  n += tPutI64(p ? p + n : p, pDelFile->maxKey);
+  n += tPutI64v(p ? p + n : p, pDelFile->minVersion);
+  n += tPutI64v(p ? p + n : p, pDelFile->maxVersion);
   n += tPutI64v(p ? p + n : p, pDelFile->size);
   n += tPutI64v(p ? p + n : p, pDelFile->offset);
 
@@ -455,7 +458,10 @@ int32_t tPutDelFileHdr(uint8_t *p, SDelFile *pDelFile) {
 int32_t tGetDelFileHdr(uint8_t *p, SDelFile *pDelFile) {
   int32_t n = 0;
 
-  n += tGetKEYINFO(p + n, &pDelFile->info);
+  n += tGetI64(p + n, &pDelFile->minKey);
+  n += tGetI64(p + n, &pDelFile->maxKey);
+  n += tGetI64v(p + n, &pDelFile->minVersion);
+  n += tGetI64v(p + n, &pDelFile->maxVersion);
   n += tGetI64v(p + n, &pDelFile->size);
   n += tGetI64v(p + n, &pDelFile->offset);
 
@@ -500,14 +506,18 @@ void tsdbRowGetColVal(TSDBROW *pRow, STSchema *pTSchema, int32_t iCol, SColVal *
   STColumn *pTColumn = &pTSchema->columns[iCol];
   SValue    value;
 
+  ASSERT(iCol > 0);
+
   if (pRow->type == 0) {
     // get from row (todo);
   } else if (pRow->type == 1) {
     SColData *pColData;
-    void     *p;
+    void     *p = NULL;
 
-    p = taosbsearch(&(SColData){.cid = pTColumn->colId}, pRow->pBlockData->aColData, pRow->pBlockData->nColData,
-                    sizeof(SBlockCol), tColDataCmprFn, TD_EQ);
+    // TODO
+    ASSERT(0);
+    // p = taosbsearch(&(SColData){.cid = pTColumn->colId}, pRow->pBlockData->apColData, pRow->pBlockData->nColData,
+    //                 sizeof(SBlockCol), tColDataCmprFn, TD_EQ);
     if (p) {
       pColData = (SColData *)p;
       ASSERT(pColData->flags);
@@ -707,8 +717,12 @@ void tColDataReset(SColData *pColData) {
   // TODO
 }
 
-void tColDataClear(SColData *pColData) {
-  // TODO
+void tColDataClear(void *ph) {
+  SColData *pColData = (SColData *)ph;
+
+  tsdbFree(pColData->pBitMap);
+  tsdbFree((uint8_t *)pColData->pOfst);
+  tsdbFree(pColData->pData);
 }
 
 int32_t tColDataAppendValue(SColData *pColData, SColVal *pColVal) {
@@ -730,50 +744,77 @@ int32_t tColDataCmprFn(const void *p1, const void *p2) {
 // SBlockData ======================================================
 static int32_t tBlockDataAddColData(SBlockData *pBlockData, int32_t iColData) {
   int32_t code = 0;
-  int32_t nColData = pBlockData->nColData;
+  // int32_t nColData = pBlockData->nColData;
+
+  // pBlockData->nColData++;
+  // if (pBlockData->nColData > pBlockData->maxCol) {
+  //   if (pBlockData->maxCol == 0) {
+  //     pBlockData->maxCol = 16;
+  //   } else {
+  //     pBlockData->maxCol *= 2;
+  //   }
+
+  //   code = tsdbRealloc((uint8_t **)&pBlockData->apColData, sizeof(SColData *) * pBlockData->maxCol);
+  //   if (code) goto _exit;
+  //   code = tsdbRealloc((uint8_t **)&pBlockData->aColData, sizeof(SColData) * pBlockData->maxCol);
+  //   if (code) goto _exit;
+
+  //   for (int32_t iColData = nColData; iColData < pBlockData->maxCol; iColData++) {
+  //     pBlockData->aColData[iColData] = tColDataInit();
+  //   }
+  // }
 
-  pBlockData->nColData++;
-  if (pBlockData->nColData > pBlockData->maxCol) {
-    if (pBlockData->maxCol == 0) {
-      pBlockData->maxCol = 16;
-    } else {
-      pBlockData->maxCol *= 2;
-    }
+  // // memmove (todo)
+  // // int32_t size = sizeof(SColData *) * (nColData - iColData);
+  // // if (size) {
+  // //   memmove();
+  // // }
 
-    code = tsdbRealloc((uint8_t **)&pBlockData->apColData, sizeof(SColData *) * pBlockData->maxCol);
-    if (code) goto _exit;
-    code = tsdbRealloc((uint8_t **)&pBlockData->aColData, sizeof(SColData) * pBlockData->maxCol);
-    if (code) goto _exit;
+  // pBlockData->apColData[iColData] = &pBlockData->aColData[nColData];
 
-    for (int32_t iColData = nColData; iColData < pBlockData->maxCol; iColData++) {
-      pBlockData->aColData[iColData] = tColDataInit();
-    }
-  }
+_exit:
+  return code;
+}
 
-  // memmove (todo)
-  // int32_t size = sizeof(SColData *) * (nColData - iColData);
-  // if (size) {
-  //   memmove();
-  // }
+int32_t tBlockDataInit(SBlockData *pBlockData) {
+  int32_t code = 0;
 
-  pBlockData->apColData[iColData] = &pBlockData->aColData[nColData];
+  *pBlockData = (SBlockData){0};
+  pBlockData->apColData = taosArrayInit(0, sizeof(SColData *));
+  if (pBlockData->apColData == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _exit;
+  }
+  pBlockData->aColData = taosArrayInit(0, sizeof(SColData));
+  if (pBlockData->aColData == NULL) {
+    taosArrayDestroy(pBlockData->apColData);
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _exit;
+  }
 
 _exit:
   return code;
 }
 
-static int32_t tBlockDataAppendRow0(SBlockData *pBlockData, TSDBROW *pRow, STSchema *pTSchema) {
-  int32_t  code = 0;
-  int32_t  nRow = pBlockData->nRow;
-  TSDBKEY  key = tsdbRowKey(pRow);
-  int32_t  iColumn;
-  int32_t  nColumn;
-  int32_t  iColData;
-  SColVal  colVal;
-  SColVal *pColVal = &colVal;
+void tBlockDataReset(SBlockData *pBlockData) {
+  pBlockData->nRow = 0;
+  taosArrayClear(pBlockData->apColData);
+}
 
-  ASSERT(pTSchema);
-  ASSERT(pTSchema->version == TSDBROW_SVERSION(pRow));
+void tBlockDataClear(SBlockData *pBlockData) {
+  tsdbFree((uint8_t *)pBlockData->aVersion);
+  tsdbFree((uint8_t *)pBlockData->aTSKEY);
+  taosArrayDestroy(pBlockData->apColData);
+  taosArrayDestroyEx(pBlockData->aColData, tColDataClear);
+}
+
+static int32_t tBlockDataAppendRow0(SBlockData *pBlockData, TSDBROW *pRow, STSchema *pTSchema);
+static int32_t tBlockDataAppendRow1(SBlockData *pBlockData, TSDBROW *pRow);
+
+int32_t tBlockDataAppendRow(SBlockData *pBlockData, TSDBROW *pRow, STSchema *pTSchema) {
+  int32_t code = 0;
+  int32_t nRow = pBlockData->nRow;
+  TSDBKEY key = tsdbRowKey(pRow);
 
   pBlockData->nRow++;
 
@@ -785,126 +826,45 @@ static int32_t tBlockDataAppendRow0(SBlockData *pBlockData, TSDBROW *pRow, STSch
       pBlockData->maxRow *= 2;
     }
 
-    ASSERT(pBlockData->maxRow >= pBlockData->nRow);
-
-    code = tsdbRealloc((uint8_t **)&pBlockData->aTSKEY, sizeof(TSKEY) * pBlockData->maxRow);
-    if (code) goto _err;
-
     code = tsdbRealloc((uint8_t **)&pBlockData->aVersion, sizeof(int64_t) * pBlockData->maxRow);
     if (code) goto _err;
+    code = tsdbRealloc((uint8_t **)&pBlockData->aTSKEY, sizeof(TSKEY) * pBlockData->maxRow);
+    if (code) goto _err;
   }
   pBlockData->aVersion[nRow] = key.version;
   pBlockData->aTSKEY[nRow] = key.ts;
 
-  // other cols
-  iColumn = 1;
-  nColumn = pTSchema->numOfCols;
-  iColData = 0;
-  while (iColumn < nColumn || iColData < pBlockData->nColData) {
-    STColumn *pTColumn = NULL;
-    SColData *pColData = NULL;
-
-    if (iColumn < nColumn) {
-      pTColumn = &pTSchema->columns[iColumn];
-    }
-    if (iColData < pBlockData->nColData) {
-      pColData = &pBlockData->aColData[iColData];
-    }
-
-    if (pTColumn && pColData) {
-      if (pTColumn->colId == pColData->cid) {
-        // tsdbRowGetColVal(pRow, pTSchema, iColumn, &cv);
-      } else if (pTColumn->colId < pColData->cid) {
-        // add a new SColData, and append the column value cv to the SColData
-      } else {
-        // add a None to the column value
-      }
-    } else if (pTColumn) {
-      // tsdbRowGetColVal(pRow, pTSchema, iColumn, &cv);
-      // add a new SColData, and append the column value cv to the SColData
-    } else {
-      iColData++;
-    }
-  }
-
-  return code;
-
-_err:
-  return code;
-}
-
-static int32_t tBlockDataAppendRow1(SBlockData *pBlockData, TSDBROW *pRow) {
-  int32_t  code = 0;
-  int32_t  nRow = pBlockData->nRow;
-  TSDBKEY  key = tsdbRowKey(pRow);
-  int32_t  iColData;
-  int32_t  iColDataRow;
-  int32_t  nColDataRow;
-  SColVal  colVal;
-  SColVal *pColVal = &colVal;
-
-  pBlockData->nRow++;
-
-  // aKey (TODO)
-  pBlockData->aVersion[nRow] = key.version;
-  pBlockData->aTSKEY[nRow] = key.ts;
-
-  // other cols
-  iColData = 0;
-  iColDataRow = 0;
-  nColDataRow = pRow->pBlockData->nColData;
-  while (iColData < pBlockData->nColData || iColDataRow < nColDataRow) {
-    SColData *pColData = NULL;
-    SColData *pColDataRow = NULL;
-
-    if (iColData < pBlockData->nColData) {
-      pColData = &pBlockData->aColData[iColData];
-    }
-    if (iColDataRow < nColDataRow) {
-      pColDataRow = &pRow->pBlockData->aColData[iColDataRow];
-    }
-
-    if (pColData && pColDataRow) {
-      if (pColData->cid == pColDataRow->cid) {
-        // TODO
-      } else if (pColData->cid < pColDataRow->cid) {
-        // TODO
+// OTHER
+#if 0
+  int32_t  iColData = 0;
+  int32_t  nColData = taosArrayGetSize(pBlockData->apColData);
+  SRowIter ri = tRowIterInit(pRow, pTSchema);
+
+  SColData *pColData = iColData < nColData ? (SColData *)taosArrayGetP(pBlockData->apColData, iColData) : NULL;
+  SColVal  *pColVal = tRowIterNext(&ri);
+  while (true) {
+    if (pColData && pColVal) {
+      if (pColData->cid == pColVal->cid) {
+        // append SColVal to SColData
+        pColVal = tRowIterNext(&ri);
+        iColData++;
+        pColData = iColData < nColData ? (SColData *)taosArrayGetP(pBlockData->apColData, iColData) : NULL;
+      } else if (pColData->cid < pColVal->cid) {
+        // append a NONE
+        iColData++;
       } else {
-        // TODO
+        // add a new SColData
       }
     } else if (pColData) {
-      // TODO
+      // add a NONE
     } else {
-      // TODO
+      // add a new SColData and append value
     }
   }
+#endif
 
   return code;
-}
-
-int32_t tBlockDataAppendRow(SBlockData *pBlockData, TSDBROW *pRow, STSchema *pTSchema) {
-  int32_t code = 0;
-  TSDBKEY key = tsdbRowKey(pRow);
-
-  if (pRow->type == 0) {
-    code = tBlockDataAppendRow0(pBlockData, pRow, pTSchema);
-  } else if (pRow->type == 1) {
-    code = tBlockDataAppendRow1(pBlockData, pRow);
-  }
 
+_err:
   return code;
-}
-
-void tBlockDataReset(SBlockData *pBlockData) {
-  pBlockData->nRow = 0;
-  pBlockData->nColData = 0;
-}
-
-void tBlockDataClear(SBlockData *pBlockData) {
-  tsdbFree((uint8_t *)pBlockData->aVersion);
-  tsdbFree((uint8_t *)pBlockData->aTSKEY);
-  for (int32_t iCol = 0; iCol < pBlockData->nColData; iCol++) {
-    tsdbFree(pBlockData->aColData[iCol].pBitMap);
-    tsdbFree(pBlockData->aColData[iCol].pData);
-  }
-}
+}
\ No newline at end of file
diff --git a/source/dnode/vnode/src/vnd/vnodeCfg.c b/source/dnode/vnode/src/vnd/vnodeCfg.c
index 79e63d5abc2a8947e7e8de3feeea267829c5f2f8..0ad388e726eb12902d080d714f25d943c993708d 100644
--- a/source/dnode/vnode/src/vnd/vnodeCfg.c
+++ b/source/dnode/vnode/src/vnd/vnodeCfg.c
@@ -79,7 +79,7 @@ int vnodeEncodeConfig(const void *pObj, SJson *pJson) {
     SJson *pNodeRetentions = tjsonCreateArray();
     tjsonAddItemToObject(pJson, "retentions", pNodeRetentions);
     for (int32_t i = 0; i < nRetention; ++i) {
-      SJson      *pNodeRetention = tjsonCreateObject();
+      SJson            *pNodeRetention = tjsonCreateObject();
       const SRetention *pRetention = pCfg->tsdbCfg.retentions + i;
       tjsonAddIntegerToObject(pNodeRetention, "freq", pRetention->freq);
       tjsonAddIntegerToObject(pNodeRetention, "freqUnit", pRetention->freqUnit);
@@ -118,45 +118,45 @@ int vnodeDecodeConfig(const SJson *pJson, void *pObj) {
 
   int32_t code;
   tjsonGetNumberValue(pJson, "vgId", pCfg->vgId, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   if (tjsonGetStringValue(pJson, "dbname", pCfg->dbname) < 0) return -1;
   tjsonGetNumberValue(pJson, "dbId", pCfg->dbId, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "szPage", pCfg->szPage, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "szCache", pCfg->szCache, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "szBuf", pCfg->szBuf, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "isHeap", pCfg->isHeap, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "isWeak", pCfg->isWeak, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "isTsma", pCfg->isTsma, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "isRsma", pCfg->isRsma, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "precision", pCfg->tsdbCfg.precision, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "update", pCfg->tsdbCfg.update, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "compression", pCfg->tsdbCfg.compression, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "slLevel", pCfg->tsdbCfg.slLevel, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "daysPerFile", pCfg->tsdbCfg.days, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "minRows", pCfg->tsdbCfg.minRows, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "maxRows", pCfg->tsdbCfg.maxRows, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "keep0", pCfg->tsdbCfg.keep0, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "keep1", pCfg->tsdbCfg.keep1, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "keep2", pCfg->tsdbCfg.keep2, code);
-  if(code < 0) return -1;
-  SJson *pNodeRetentions = tjsonGetObjectItem(pJson, "retentions");
+  if (code < 0) return -1;
+  SJson  *pNodeRetentions = tjsonGetObjectItem(pJson, "retentions");
   int32_t nRetention = tjsonGetArraySize(pNodeRetentions);
   if (nRetention > TSDB_RETENTION_MAX) {
     nRetention = TSDB_RETENTION_MAX;
@@ -170,30 +170,30 @@ int vnodeDecodeConfig(const SJson *pJson, void *pObj) {
     tjsonGetNumberValue(pNodeRetention, "keepUnit", (pCfg->tsdbCfg.retentions)[i].keepUnit, code);
   }
   tjsonGetNumberValue(pJson, "wal.vgId", pCfg->walCfg.vgId, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "wal.fsyncPeriod", pCfg->walCfg.fsyncPeriod, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "wal.retentionPeriod", pCfg->walCfg.retentionPeriod, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "wal.rollPeriod", pCfg->walCfg.rollPeriod, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "wal.retentionSize", pCfg->walCfg.retentionSize, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "wal.segSize", pCfg->walCfg.segSize, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "wal.level", pCfg->walCfg.level, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "hashBegin", pCfg->hashBegin, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "hashEnd", pCfg->hashEnd, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "hashMethod", pCfg->hashMethod, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
 
   tjsonGetNumberValue(pJson, "syncCfg.replicaNum", pCfg->syncCfg.replicaNum, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "syncCfg.myIndex", pCfg->syncCfg.myIndex, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
 
   SJson *pNodeInfoArr = tjsonGetObjectItem(pJson, "syncCfg.nodeInfo");
   int    arraySize = tjsonGetArraySize(pNodeInfoArr);
diff --git a/source/dnode/vnode/src/vnd/vnodeCommit.c b/source/dnode/vnode/src/vnd/vnodeCommit.c
index 3715866bb88f3ae030d5f65c7ce938e69120f466..3d9d2d8efbdd5bd5d54afa554a1ddcba6bdc4c59 100644
--- a/source/dnode/vnode/src/vnd/vnodeCommit.c
+++ b/source/dnode/vnode/src/vnd/vnodeCommit.c
@@ -311,9 +311,9 @@ static int vnodeDecodeState(const SJson *pJson, void *pObj) {
 
   int32_t code;
   tjsonGetNumberValue(pJson, "commit version", pState->committed, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
   tjsonGetNumberValue(pJson, "applied version", pState->applied, code);
-  if(code < 0) return -1;
+  if (code < 0) return -1;
 
   return 0;
 }