diff --git a/include/common/trow.h b/include/common/trow.h
index 6094425bbf3d65524d97f3228872578a56ac2b2c..e699031d7adeb5ce7f74802b7a66652c52ff974c 100644
--- a/include/common/trow.h
+++ b/include/common/trow.h
@@ -16,16 +16,54 @@
 #ifndef _TD_COMMON_ROW_H_
 #define _TD_COMMON_ROW_H_
 
+#include "os.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-typedef struct SRow SRow;
+// types
+typedef void *                  SRow;
+typedef struct SRowBatch        SRowBatch;
+typedef struct SRowBuilder      SRowBuilder;
+typedef struct SRowBatchIter    SRowBatchIter;
+typedef struct SRowBatchBuilder SRowBatchBuilder;
+
+// SRow
+#define ROW_HEADER_SIZE (sizeof(uint8_t) + 2 * sizeof(uint16_t) + sizeof(uint64_t))
+#define rowType(r) (*(uint8_t *)(r))                                // row type
+#define rowLen(r) (*(uint16_t *)POINTER_SHIFT(r, sizeof(uint8_t)))  // row length
+#define rowSVer(r) \
+  (*(uint16_t *)POINTER_SHIFT(r, sizeof(uint8_t) + sizeof(uint16_t)))  // row schema version, only for SDataRow
+#define rowNCols(r) rowSVer(r)                                         // only for SKVRow
+#define rowVer(r) (*(uint64_t)POINTER_SHIFT(r, sizeof(uint8_t) + 2 * sizeof(uint16_t)))  // row version
+#define rowCopy(dest, r) memcpy((dest), r, rowLen(r))
+
+static FORCE_INLINE SRow rowDup(SRow row) {
+  SRow r = malloc(rowLen(row));
+  if (r == NULL) {
+    return NULL;
+  }
+
+  rowCopy(r, row);
+
+  return r;
+}
+
+// SRowBatch
+
+// SRowBuilder
+SRowBuilder *rowBuilderCreate();
+void         rowBuilderDestroy(SRowBuilder *);
+
+// SRowBatchIter
+SRowBatchIter *rowBatchIterCreate(SRowBatch *);
+void           rowBatchIterDestroy(SRowBatchIter *);
+const SRow     rowBatchIterNext(SRowBatchIter *);
 
-#define rowType(r)
-#define rowLen(r)
-#define rowVersion(r)
-#define rowNCols(r)
+// SRowBatchBuilder
+SRowBatchBuilder *rowBatchBuilderCreate();
+void              rowBatchBuilderDestroy(SRowBatchBuilder *);
 
 #ifdef __cplusplus
 }
diff --git a/source/common/src/trow.c b/source/common/src/trow.c
index 6dea4a4e57392be988126c579648f39a8270b9bf..cf1b0ecefff4309ef7a86144f412cd0fed03d181 100644
--- a/source/common/src/trow.c
+++ b/source/common/src/trow.c
@@ -11,4 +11,79 @@
  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
\ No newline at end of file
+ */
+
+#include "trow.h"
+
+/* ------------ Structures ---------- */
+struct SRowBatch {
+  int32_t compress : 1;  // if batch row is compressed
+  int32_t nrows : 31;    // number of rows
+  int32_t tlen;          // total length (including `nrows` and `tlen`)
+  char    rows[];
+};
+
+struct SRowBuilder {
+  // TODO
+};
+
+struct SRowBatchIter {
+  int32_t    counter;  // row counter
+  SRowBatch *rb;       // row batch to iter
+  SRow       nrow;     // next row
+};
+
+struct SRowBatchBuilder {
+  // TODO
+};
+
+/* ------------ Methods ---------- */
+
+// SRowBuilder
+SRowBuilder *rowBuilderCreate() {
+  SRowBuilder *pRowBuilder = NULL;
+  // TODO
+
+  return pRowBuilder;
+}
+
+void rowBuilderDestroy(SRowBuilder *pRowBuilder) {
+  if (pRowBuilder) {
+    free(pRowBuilder);
+  }
+}
+
+// SRowBatchIter
+SRowBatchIter *rowBatchIterCreate(SRowBatch *pRowBatch) {
+  SRowBatchIter *pRowBatchIter = (SRowBatchIter *)malloc(sizeof(*pRowBatchIter));
+  if (pRowBatchIter == NULL) {
+    return NULL;
+  }
+
+  pRowBatchIter->counter = 0;
+  pRowBatchIter->rb = pRowBatch;
+  pRowBatchIter->nrow = pRowBatch->rows;
+
+  return pRowBatchIter;
+};
+
+void rowBatchIterDestroy(SRowBatchIter *pRowBatchIter) {
+  if (pRowBatchIter) {
+    free(pRowBatchIter);
+  }
+}
+
+const SRow rowBatchIterNext(SRowBatchIter *pRowBatchIter) {
+  SRow r = NULL;
+  if (pRowBatchIter->counter < pRowBatchIter->rb->nrows) {
+    r = pRowBatchIter->nrow;
+    pRowBatchIter->counter += 1;
+    pRowBatchIter->nrow = (SRow)POINTER_SHIFT(r, rowLen(r));
+  }
+
+  return r;
+}
+
+// SRowBatchBuilder
+SRowBatchBuilder *rowBatchBuilderCreate();
+void              rowBatchBuilderDestroy(SRowBatchBuilder *);
\ No newline at end of file
diff --git a/source/server/vnode/meta/test/metaTests.cpp b/source/server/vnode/meta/test/metaTests.cpp
index c62ae0aa0224a6724839fe41fe692f2b1dae37d6..ab204455f21ba17e94de860e6541517dfbfb7e1b 100644
--- a/source/server/vnode/meta/test/metaTests.cpp
+++ b/source/server/vnode/meta/test/metaTests.cpp
@@ -4,5 +4,6 @@
 #include "meta.h"
 
 TEST(MetaTest, meta_open_test) {
+    metaOpen(NULL);
     std::cout << "Hello META!" << std::endl;
 }
\ No newline at end of file