diff --git a/include/dnode/vnode/meta/meta.h b/include/dnode/vnode/meta/meta.h
index d587107270..b8b8bad74a 100644
--- a/include/dnode/vnode/meta/meta.h
+++ b/include/dnode/vnode/meta/meta.h
@@ -38,7 +38,7 @@ typedef struct SMetaCfg {
 } SMetaCfg;
 
 typedef struct {
-  int32_t  nCols;
+  uint32_t nCols;
   SSchema *pSchema;
 } SSchemaWrapper;
 
diff --git a/source/dnode/vnode/meta/src/metaBDBImpl.c b/source/dnode/vnode/meta/src/metaBDBImpl.c
index af8af6a052..4254ad0acd 100644
--- a/source/dnode/vnode/meta/src/metaBDBImpl.c
+++ b/source/dnode/vnode/meta/src/metaBDBImpl.c
@@ -23,6 +23,7 @@
 typedef struct {
   tb_uid_t uid;
   int32_t  sver;
+  int32_t  padding;
 } SSchemaKey;
 
 struct SMetaDB {
@@ -55,6 +56,8 @@ static int      metaCtbIdxCb(DB *pIdx, const DBT *pKey, const DBT *pValue, DBT *
 static int      metaEncodeTbInfo(void **buf, STbCfg *pTbCfg);
 static void *   metaDecodeTbInfo(void *buf, STbCfg *pTbCfg);
 static void     metaClearTbCfg(STbCfg *pTbCfg);
+static int      metaEncodeSchema(void **buf, SSchemaWrapper *pSW);
+static void *   metaDecodeSchema(void *buf, SSchemaWrapper *pSW);
 
 #define BDB_PERR(info, code) fprintf(stderr, info " reason: %s", db_strerror(code))
 
@@ -169,18 +172,13 @@ int metaSaveTableToDB(SMeta *pMeta, STbCfg *pTbCfg) {
     pBuf = buf;
     memset(&key, 0, sizeof(key));
     memset(&value, 0, sizeof(key));
-    SSchemaKey schemaKey = {uid, 0 /*TODO*/};
+    SSchemaKey schemaKey = {uid, 0 /*TODO*/, 0};
 
     key.data = &schemaKey;
     key.size = sizeof(schemaKey);
 
-    taosEncodeFixedU32(&pBuf, ncols);
-    for (size_t i = 0; i < ncols; i++) {
-      taosEncodeFixedI8(&pBuf, pSchema[i].type);
-      taosEncodeFixedI32(&pBuf, pSchema[i].colId);
-      taosEncodeFixedI32(&pBuf, pSchema[i].bytes);
-      taosEncodeString(&pBuf, pSchema[i].name);
-    }
+    SSchemaWrapper sw = {.nCols = ncols, .pSchema = pSchema};
+    metaEncodeSchema(&pBuf, &sw);
 
     value.data = buf;
     value.size = POINTER_DISTANCE(pBuf, buf);
@@ -197,6 +195,38 @@ int metaRemoveTableFromDb(SMeta *pMeta, tb_uid_t uid) {
 }
 
 /* ------------------------ STATIC METHODS ------------------------ */
+static int metaEncodeSchema(void **buf, SSchemaWrapper *pSW) {
+  int      tlen = 0;
+  SSchema *pSchema;
+
+  tlen += taosEncodeFixedU32(buf, pSW->nCols);
+  for (int i = 0; i < pSW->nCols; i++) {
+    pSchema = pSW->pSchema + i;
+    tlen += taosEncodeFixedI8(buf, pSchema->type);
+    tlen += taosEncodeFixedI32(buf, pSchema->colId);
+    tlen += taosEncodeFixedI32(buf, pSchema->bytes);
+    tlen += taosEncodeString(buf, pSchema->name);
+  }
+
+  return tlen;
+}
+
+static void *metaDecodeSchema(void *buf, SSchemaWrapper *pSW) {
+  SSchema *pSchema;
+
+  buf = taosDecodeFixedU32(buf, &pSW->nCols);
+  pSW->pSchema = (SSchema *)malloc(sizeof(SSchema) * pSW->nCols);
+  for (int i = 0; i < pSW->nCols; i++) {
+    pSchema = pSW->pSchema + i;
+    buf = taosDecodeFixedI8(buf, &pSchema->type);
+    buf = taosDecodeFixedI32(buf, &pSchema->colId);
+    buf = taosDecodeFixedI32(buf, &pSchema->bytes);
+    buf = taosDecodeStringTo(buf, pSchema->name);
+  }
+
+  return buf;
+}
+
 static SMetaDB *metaNewDB() {
   SMetaDB *pDB = NULL;
   pDB = (SMetaDB *)calloc(1, sizeof(*pDB));
@@ -376,15 +406,8 @@ static int metaEncodeTbInfo(void **buf, STbCfg *pTbCfg) {
   tsize += taosEncodeFixedU8(buf, pTbCfg->type);
 
   if (pTbCfg->type == META_SUPER_TABLE) {
-    tsize += taosEncodeVariantU32(buf, pTbCfg->stbCfg.nTagCols);
-    for (uint32_t i = 0; i < pTbCfg->stbCfg.nTagCols; i++) {
-      tsize += taosEncodeFixedI8(buf, pTbCfg->stbCfg.pTagSchema[i].type);
-      tsize += taosEncodeFixedI32(buf, pTbCfg->stbCfg.pTagSchema[i].colId);
-      tsize += taosEncodeFixedI32(buf, pTbCfg->stbCfg.pTagSchema[i].bytes);
-      tsize += taosEncodeString(buf, pTbCfg->stbCfg.pTagSchema[i].name);
-    }
-
-    // tsize += tdEncodeSchema(buf, pTbCfg->stbCfg.pTagSchema);
+    SSchemaWrapper sw = {.nCols = pTbCfg->stbCfg.nTagCols, .pSchema = pTbCfg->stbCfg.pTagSchema};
+    tsize += metaEncodeSchema(buf, &sw);
   } else if (pTbCfg->type == META_CHILD_TABLE) {
     tsize += taosEncodeFixedU64(buf, pTbCfg->ctbCfg.suid);
     tsize += tdEncodeKVRow(buf, pTbCfg->ctbCfg.pTag);
@@ -403,14 +426,10 @@ static void *metaDecodeTbInfo(void *buf, STbCfg *pTbCfg) {
   buf = taosDecodeFixedU8(buf, &(pTbCfg->type));
 
   if (pTbCfg->type == META_SUPER_TABLE) {
-    buf = taosDecodeVariantU32(buf, &(pTbCfg->stbCfg.nTagCols));
-    pTbCfg->stbCfg.pTagSchema = (SSchema *)malloc(sizeof(SSchema) * pTbCfg->stbCfg.nTagCols);
-    for (uint32_t i = 0; i < pTbCfg->stbCfg.nTagCols; i++) {
-      buf = taosDecodeFixedI8(buf, &(pTbCfg->stbCfg.pTagSchema[i].type));
-      buf = taosDecodeFixedI32(buf, &pTbCfg->stbCfg.pTagSchema[i].colId);
-      buf = taosDecodeFixedI32(buf, &pTbCfg->stbCfg.pTagSchema[i].bytes);
-      buf = taosDecodeStringTo(buf, pTbCfg->stbCfg.pTagSchema[i].name);
-    }
+    SSchemaWrapper sw;
+    buf = metaDecodeSchema(buf, &sw);
+    pTbCfg->stbCfg.nTagCols = sw.nCols;
+    pTbCfg->stbCfg.pTagSchema = sw.pSchema;
   } else if (pTbCfg->type == META_CHILD_TABLE) {
     buf = taosDecodeFixedU64(buf, &(pTbCfg->ctbCfg.suid));
     buf = tdDecodeKVRow(buf, &(pTbCfg->ctbCfg.pTag));
@@ -496,7 +515,7 @@ SSchemaWrapper *metaGetTableSchema(SMeta *pMeta, tb_uid_t uid, int32_t sver, boo
   int             ret;
   void *          pBuf;
   SSchema *       pSchema;
-  SSchemaKey      schemaKey = {uid, sver};
+  SSchemaKey      schemaKey = {uid, sver, 0};
   DBT             key = {0};
   DBT             value = {0};
 
@@ -507,38 +526,14 @@ SSchemaWrapper *metaGetTableSchema(SMeta *pMeta, tb_uid_t uid, int32_t sver, boo
   // Query
   ret = pDB->pSchemaDB->get(pDB->pSchemaDB, NULL, &key, &value, 0);
   if (ret != 0) {
+    printf("failed to query schema DB since %s================\n", db_strerror(ret));
     return NULL;
   }
 
   // Decode the schema
   pBuf = value.data;
-  taosDecodeFixedI32(&pBuf, &nCols);
-  if (isinline) {
-    pSW = (SSchemaWrapper *)malloc(sizeof(*pSW) + sizeof(SSchema) * nCols);
-    if (pSW == NULL) {
-      return NULL;
-    }
-    pSW->pSchema = POINTER_SHIFT(pSW, sizeof(*pSW));
-  } else {
-    pSW = (SSchemaWrapper *)malloc(sizeof(*pSW));
-    if (pSW == NULL) {
-      return NULL;
-    }
-
-    pSW->pSchema = (SSchema *)malloc(sizeof(SSchema) * nCols);
-    if (pSW->pSchema == NULL) {
-      free(pSW);
-      return NULL;
-    }
-  }
-
-  for (int i = 0; i < nCols; i++) {
-    pSchema = pSW->pSchema + i;
-    taosDecodeFixedI8(&pBuf, &(pSchema->type));
-    taosDecodeFixedI32(&pBuf, &(pSchema->colId));
-    taosDecodeFixedI32(&pBuf, &(pSchema->bytes));
-    taosDecodeStringTo(&pBuf, pSchema->name);
-  }
+  pSW = malloc(sizeof(*pSW));
+  metaDecodeSchema(pBuf, pSW);
 
   return pSW;
 }