diff --git a/include/libs/planner/planner.h b/include/libs/planner/planner.h
index a7d418d45e5dd2093188a5340ab241619623b3c8..28d9a0451346b930115d1e3d4da3ad9e7ee077ee 100644
--- a/include/libs/planner/planner.h
+++ b/include/libs/planner/planner.h
@@ -34,6 +34,13 @@ enum OPERATOR_TYPE_E {
   OP_TotalNum
 };
 
+enum DATASINK_TYPE_E {
+  DSINK_Unknown,
+  DSINK_Dispatch,
+  DSINK_Insert,
+  DSINK_TotalNum
+};
+
 struct SEpSet;
 struct SQueryStmtInfo;
 
@@ -49,6 +56,22 @@ typedef struct SQueryNodeBasicInfo {
   const char *name;          // operator name
 } SQueryNodeBasicInfo;
 
+typedef struct SDataSink {
+  SQueryNodeBasicInfo info;
+  SDataBlockSchema schema;
+} SDataSink;
+
+typedef struct SDataDispatcher {
+  SDataSink sink;
+  // todo
+} SDataDispatcher;
+
+typedef struct SDataInserter {
+  SDataSink sink;
+  uint64_t    uid;  // unique id of the table
+  // todo data field
+} SDataInserter;
+
 typedef struct SPhyNode {
   SQueryNodeBasicInfo info;
   SArray             *pTargets;      // target list to be computed or scanned at this node
@@ -113,15 +136,16 @@ typedef struct SQueryDag {
  */
 int32_t qCreateQueryDag(const struct SQueryStmtInfo* pQueryInfo, struct SEpSet* pQnode, struct SQueryDag** pDag);
 
-int32_t qSetSuplanExecutionNode(SArray* subplans, SArray* nodes);
+int32_t qSetSuplanExecutionNode(SSubplan* subplan, SArray* nodes);
 
 int32_t qExplainQuery(const struct SQueryStmtInfo* pQueryInfo, struct SEpSet* pQnode, char** str);
 
-
 /**
  * Convert to subplan to string for the scheduler to send to the executor
  */
-int32_t qSubPlanToString(struct SSubplan *pPhyNode, char** str);
+int32_t qSubPlanToString(const SSubplan* subplan, char** str);
+
+int32_t qStringToSubplan(const char* str, SSubplan** subplan);
 
 /**
  * Destroy the physical plan.
diff --git a/include/libs/planner/plannerOp.h b/include/libs/planner/plannerOp.h
index 9f51969dc1d00028a3fcf6a508966d7e787bdcb5..41d6e028cf026aca203737567028a20e7a511c57 100644
--- a/include/libs/planner/plannerOp.h
+++ b/include/libs/planner/plannerOp.h
@@ -14,13 +14,13 @@
  */
 
 #if defined(INCLUDE_AS_ENUM)  // enum define mode
-    #undef OP_ENUM_MACRO
-    #define OP_ENUM_MACRO(op)    OP_##op,
+  #undef OP_ENUM_MACRO
+  #define OP_ENUM_MACRO(op)    OP_##op,
 #elif defined(INCLUDE_AS_NAME)  // comment define mode
-    #undef OP_ENUM_MACRO
-    #define OP_ENUM_MACRO(op)    #op,
+  #undef OP_ENUM_MACRO
+  #define OP_ENUM_MACRO(op)    #op,
 #else
-    #error To use this include file, first define either INCLUDE_AS_ENUM or INCLUDE_AS_NAME
+  #error To use this include file, first define either INCLUDE_AS_ENUM or INCLUDE_AS_NAME
 #endif
 
 OP_ENUM_MACRO(TableScan)
diff --git a/source/libs/parser/src/insertParser.c b/source/libs/parser/src/insertParser.c
index f63f13d8ac180ddb93007d564cece710a7e4babc..877ecb2c85457c9aff9de9454306c9fffc559bf8 100644
--- a/source/libs/parser/src/insertParser.c
+++ b/source/libs/parser/src/insertParser.c
@@ -77,6 +77,14 @@ typedef struct SInsertParseContext {
   SInsertStmtInfo* pOutput;
 } SInsertParseContext;
 
+typedef int32_t (*FRowAppend)(const void *value, int32_t len, void *param);
+
+typedef struct SKvParam {
+  char buf[TSDB_MAX_TAGS_LEN];
+  SKVRowBuilder* builder;
+  SSchema* schema;
+} SKvParam;
+
 static uint8_t TRUE_VALUE = (uint8_t)TSDB_TRUE;
 static uint8_t FALSE_VALUE = (uint8_t)TSDB_FALSE;
 
@@ -300,14 +308,6 @@ static int parseTime(SInsertParseContext* pCxt, SToken *pToken, int16_t timePrec
   return TSDB_CODE_SUCCESS;
 }
 
-typedef int32_t (*FRowAppend)(const void *value, int32_t len, void *param);
-
-typedef struct SKvParam {
-  char buf[TSDB_MAX_TAGS_LEN];
-  SKVRowBuilder* builder;
-  SSchema* schema;
-} SKvParam;
-
 static FORCE_INLINE int32_t KvRowAppend(const void *value, int32_t len, void *param) {
   SKvParam* pa = (SKvParam*)param;
   if (TSDB_DATA_TYPE_BINARY == pa->schema->type) {
diff --git a/source/libs/planner/CMakeLists.txt b/source/libs/planner/CMakeLists.txt
index 4e0d03d07ae55ca85ddb44fc621ad8cce0056f27..8a309af526a03251cff147e23a384bb8cf80479a 100644
--- a/source/libs/planner/CMakeLists.txt
+++ b/source/libs/planner/CMakeLists.txt
@@ -8,7 +8,7 @@ target_include_directories(
 
 target_link_libraries(
     planner
-    PRIVATE os util common catalog parser transport function query
+    PRIVATE os util common cjson catalog parser transport function query
 )
 
 ADD_SUBDIRECTORY(test)
diff --git a/source/libs/planner/inc/plannerInt.h b/source/libs/planner/inc/plannerInt.h
index 38b399fb0bdc388e18f103b385b453649f34eb0b..c5f948b722ada725ec771f9226ff09b9524a59d2 100644
--- a/source/libs/planner/inc/plannerInt.h
+++ b/source/libs/planner/inc/plannerInt.h
@@ -101,13 +101,7 @@ int32_t queryPlanToSql(struct SQueryPlanNode* pQueryNode, char** sql);
 
 int32_t createDag(SQueryPlanNode* pQueryNode, struct SCatalog* pCatalog, SQueryDag** pDag);
 
-/**
- * Convert to physical plan to string to enable to print it out in the shell.
- * @param pPhyNode
- * @param str
- * @return
- */
-int32_t phyPlanToString(struct SPhyNode *pPhyNode, char** str);
+int32_t subPlanToString(const SSubplan *pPhyNode, char** str);
 
 /**
  * Destroy the query plan object.
diff --git a/source/libs/planner/src/physicalPlan.c b/source/libs/planner/src/physicalPlan.c
index 277703f5c0b65618a122f566884394f976f62837..67e5770b758dd439fc493b97ca3cd9ed6b1f8c74 100644
--- a/source/libs/planner/src/physicalPlan.c
+++ b/source/libs/planner/src/physicalPlan.c
@@ -215,7 +215,3 @@ int32_t createDag(SQueryPlanNode* pQueryNode, struct SCatalog* pCatalog, SQueryD
   *pDag = context.pDag;
   return TSDB_CODE_SUCCESS;
 }
-
-int32_t subPlanToString(struct SSubplan *pPhyNode, char** str) {
-  return TSDB_CODE_SUCCESS;
-}
diff --git a/source/libs/planner/src/physicalPlanJson.c b/source/libs/planner/src/physicalPlanJson.c
new file mode 100644
index 0000000000000000000000000000000000000000..943c6b8dc0cb4cd7f5a417f2e41ae693b2d13bc4
--- /dev/null
+++ b/source/libs/planner/src/physicalPlanJson.c
@@ -0,0 +1,410 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * 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/>.
+ */
+
+#include "plannerInt.h"
+#include "parser.h"
+#include "cJSON.h"
+
+typedef cJSON* (*FToObj)(const void* obj); 
+
+static bool addObject(cJSON* json, const char* name, FToObj func, const void* obj) {
+  if (NULL == obj) {
+    return true;
+  }
+
+  cJSON* jObj = func(obj);
+  if (NULL == jObj) {
+    return false;
+  }
+  return cJSON_AddItemToObject(json, name, jObj);
+}
+
+static bool addItem(cJSON* json, FToObj func, const void* item) {
+  cJSON* jItem = func(item);
+  if (NULL == jItem) {
+    return false;
+  }
+  return cJSON_AddItemToArray(json, jItem);
+}
+
+static bool addArray(cJSON* json, const char* name, FToObj func, const SArray* array) {
+  size_t size = (NULL == array) ? 0 : taosArrayGetSize(array);
+  if (size > 0) {
+    cJSON* jArray = cJSON_AddArrayToObject(json, name);
+    if (NULL == jArray) {
+      return false;
+    }
+    for (size_t i = 0; i < size; ++i) {
+      if (!addItem(jArray, func, taosArrayGetP(array, i))) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
+static bool addRawArray(cJSON* json, const char* name, FToObj func, const void* array, int32_t itemSize, int32_t size) {
+  if (size > 0) {
+    cJSON* jArray = cJSON_AddArrayToObject(json, name);
+    if (NULL == jArray) {
+      return false;
+    }
+    for (size_t i = 0; i < size; ++i) {
+      if (!addItem(jArray, func, (const char*)array + itemSize * i)) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
+static cJSON* schemaToJson(const void* obj) {
+  const SSlotSchema* schema = (const SSlotSchema*)obj;
+  cJSON* jSchema = cJSON_CreateObject();
+  if (NULL == jSchema) {
+    return NULL;
+  }
+
+  // The 'name' field do not need to be serialized.
+
+  bool res = cJSON_AddNumberToObject(jSchema, "Type", schema->type);
+  if (res) {
+    res = cJSON_AddNumberToObject(jSchema, "ColId", schema->colId);
+  }
+  if (res) {
+    res = cJSON_AddNumberToObject(jSchema, "Bytes", schema->bytes);
+  }
+
+  if (!res) {
+    cJSON_Delete(jSchema);
+    return NULL;
+  }
+  return jSchema;
+}
+
+static cJSON* columnFilterInfoToJson(const void* obj) {
+  const SColumnFilterInfo* filter = (const SColumnFilterInfo*)obj;
+  cJSON* jFilter = cJSON_CreateObject();
+  if (NULL == jFilter) {
+    return NULL;
+  }
+
+  bool res = cJSON_AddNumberToObject(jFilter, "LowerRelOptr", filter->lowerRelOptr);
+  if (res) {
+    res = cJSON_AddNumberToObject(jFilter, "UpperRelOptr", filter->upperRelOptr);
+  }
+  if (res) {
+    res = cJSON_AddNumberToObject(jFilter, "Filterstr", filter->filterstr);
+  }
+  if (res) {
+    res = cJSON_AddNumberToObject(jFilter, "LowerBnd", filter->lowerBndd);
+  }
+  if (res) {
+    res = cJSON_AddNumberToObject(jFilter, "UpperBnd", filter->upperBndd);
+  }
+
+  if (!res) {
+    cJSON_Delete(jFilter);
+    return NULL;
+  }
+  return jFilter;
+}
+
+static cJSON* columnInfoToJson(const void* obj) {
+  const SColumnInfo* col = (const SColumnInfo*)obj;
+  cJSON* jCol = cJSON_CreateObject();
+  if (NULL == jCol) {
+    return NULL;
+  }
+
+  bool res = cJSON_AddNumberToObject(jCol, "ColId", col->colId);
+  if (res) {
+    res = cJSON_AddNumberToObject(jCol, "Type", col->type);
+  }
+  if (res) {
+    res = cJSON_AddNumberToObject(jCol, "Bytes", col->bytes);
+  }
+  if (res) {
+    res = addRawArray(jCol, "FilterList", columnFilterInfoToJson, col->flist.filterInfo, sizeof(SColumnFilterInfo), col->flist.numOfFilters);
+  }
+
+  if (!res) {
+    cJSON_Delete(jCol);
+    return NULL;
+  }
+  return jCol;
+}
+
+static cJSON* columnToJson(const void* obj) {
+  const SColumn* col = (const SColumn*)obj;
+  cJSON* jCol = cJSON_CreateObject();
+  if (NULL == jCol) {
+    return NULL;
+  }
+
+  bool res = cJSON_AddNumberToObject(jCol, "TableId", col->uid);
+  if (res) {
+    res = cJSON_AddNumberToObject(jCol, "Flag", col->flag);
+  }
+  if (res) {
+    res = addObject(jCol, "Info", columnInfoToJson, &col->info);
+  }
+
+  if (!res) {
+    cJSON_Delete(jCol);
+    return NULL;
+  }
+  return jCol;
+}
+
+static cJSON* exprNodeToJson(const void* obj);
+
+static cJSON* operatorToJson(const void* obj) {
+  const tExprNode* exprInfo = (const tExprNode*)obj;
+  cJSON* jOper = cJSON_CreateObject();
+  if (NULL == jOper) {
+    return NULL;
+  }
+
+  bool res = cJSON_AddNumberToObject(jOper, "Oper", exprInfo->_node.optr);
+  if (res) {
+    res = addObject(jOper, "Left", exprNodeToJson, exprInfo->_node.pLeft);
+  }
+  if (res) {
+    res = addObject(jOper, "Right", exprNodeToJson, exprInfo->_node.pRight);
+  }
+
+  if (!res) {
+    cJSON_Delete(jOper);
+    return NULL;
+  }
+  return jOper;
+}
+
+static cJSON* functionToJson(const void* obj) {
+  const tExprNode* exprInfo = (const tExprNode*)obj;
+  cJSON* jFunc = cJSON_CreateObject();
+  if (NULL == jFunc) {
+    return NULL;
+  }
+
+  bool res = cJSON_AddStringToObject(jFunc, "Name", exprInfo->_function.functionName);
+  if (res) {
+    res = addRawArray(jFunc, "Child", exprNodeToJson, exprInfo->_function.pChild, sizeof(tExprNode*), exprInfo->_function.num);
+  }
+
+  if (!res) {
+    cJSON_Delete(jFunc);
+    return NULL;
+  }
+  return jFunc;
+}
+
+static cJSON* variantToJson(const void* obj) {
+  const SVariant* var = (const SVariant*)obj;
+  cJSON* jVar = cJSON_CreateObject();
+  if (NULL == jVar) {
+    return NULL;
+  }
+
+  bool res = cJSON_AddNumberToObject(jVar, "Type", var->nType);
+  if (res) {
+    res = cJSON_AddNumberToObject(jVar, "Len", var->nLen);
+  }
+  if (res) {
+    if (0/* in */) {
+      res = addArray(jVar, "values", variantToJson, var->arr);
+    } else if (IS_NUMERIC_TYPE(var->nType)) {
+      res = cJSON_AddNumberToObject(jVar, "Value", var->d);
+    } else {
+      res = cJSON_AddStringToObject(jVar, "Value", var->pz);
+    }
+  }
+
+  if (!res) {
+    cJSON_Delete(jVar);
+    return NULL;
+  }
+  return jVar;
+}
+
+static cJSON* exprNodeToJson(const void* obj) {
+  const tExprNode* exprInfo = (const tExprNode*)obj;
+  cJSON* jExprInfo = cJSON_CreateObject();
+  if (NULL == jExprInfo) {
+    return NULL;
+  }
+
+  bool res = cJSON_AddNumberToObject(jExprInfo, "Type", exprInfo->nodeType);
+  if (res) {
+    switch (exprInfo->nodeType) {
+      case TEXPR_BINARYEXPR_NODE:
+      case TEXPR_UNARYEXPR_NODE:
+        res = addObject(jExprInfo, "Operator", operatorToJson, exprInfo);
+        break;
+      case TEXPR_FUNCTION_NODE:
+        res = addObject(jExprInfo, "Function", functionToJson, exprInfo);
+        break;
+      case TEXPR_COL_NODE:
+        res = addObject(jExprInfo, "Column", schemaToJson, exprInfo->pSchema);
+        break;
+      case TEXPR_VALUE_NODE:
+        res = addObject(jExprInfo, "Value", variantToJson, exprInfo->pVal);
+        break;
+      default:
+        res = false;
+        break;
+    }
+  }
+
+  if (!res) {
+    cJSON_Delete(jExprInfo);
+    return NULL;
+  }
+  return jExprInfo;
+}
+
+static cJSON* sqlExprToJson(const void* obj) {
+  const SSqlExpr* expr = (const SSqlExpr*)obj;
+  cJSON* jExpr = cJSON_CreateObject();
+  if (NULL == jExpr) {
+    return NULL;
+  }
+
+  // token does not need to be serialized.
+
+  bool res = addObject(jExpr, "Schema", schemaToJson, &expr->resSchema);
+  if (res) {
+    res = addRawArray(jExpr, "Columns", columnToJson, expr->pColumns, sizeof(SColumn), expr->numOfCols);
+  }
+  if (res) {
+    res = cJSON_AddNumberToObject(jExpr, "InterBytes", expr->interBytes);
+  }
+  if (res) {
+    res = addRawArray(jExpr, "Params", variantToJson, expr->param, sizeof(SVariant), expr->numOfParams);
+  }
+
+  if (!res) {
+    cJSON_Delete(jExpr);
+    return NULL;
+  }
+  return jExpr;
+}
+
+static cJSON* exprInfoToJson(const void* obj) {
+  const SExprInfo* exprInfo = (const SExprInfo*)obj;
+  cJSON* jExprInfo = cJSON_CreateObject();
+  if (NULL == jExprInfo) {
+    return NULL;
+  }
+
+  bool res = addObject(jExprInfo, "Base", sqlExprToJson, &exprInfo->base);
+  if (res) {
+    res = addObject(jExprInfo, "Expr", exprNodeToJson, exprInfo->pExpr);
+  }
+
+  if (!res) {
+    cJSON_Delete(jExprInfo);
+    return NULL;
+  }
+  return jExprInfo;
+}
+
+static cJSON* phyNodeToJson(const void* obj) {
+  const SPhyNode* phyNode = (const SPhyNode*)obj;
+  cJSON* jNode = cJSON_CreateObject();
+  if (NULL == jNode) {
+    return NULL;
+  }
+
+  // The 'pParent' field do not need to be serialized.
+
+  bool res = cJSON_AddStringToObject(jNode, "Name", phyNode->info.name);
+  if (res) {
+    res = addArray(jNode, "Targets", exprInfoToJson, phyNode->pTargets);
+  }
+  if (res) {
+    res = addArray(jNode, "Conditions", exprInfoToJson, phyNode->pConditions);
+  }
+  if (res) {
+    res = addRawArray(jNode, "Schema", schemaToJson, phyNode->targetSchema.pSchema, sizeof(SSlotSchema), phyNode->targetSchema.numOfCols);
+  }
+  if (res) {
+    res = addArray(jNode, "Children", phyNodeToJson, phyNode->pChildren);
+  }
+
+  if (!res) {
+    cJSON_Delete(jNode);
+    return NULL;
+  }
+  return jNode;
+}
+
+static cJSON* subplanIdToJson(const void* obj) {
+  const SSubplanId* id = (const SSubplanId*)obj;
+  cJSON* jId = cJSON_CreateObject();
+  if (NULL == jId) {
+    return NULL;
+  }
+
+  bool res = cJSON_AddNumberToObject(jId, "QueryId", id->queryId);
+  if (res) {
+    res = cJSON_AddNumberToObject(jId, "TemplateId", id->templateId);
+  }
+  if (res) {
+    res = cJSON_AddNumberToObject(jId, "SubplanId", id->subplanId);
+  }
+
+  if (!res) {
+    cJSON_Delete(jId);
+    return NULL;
+  }
+  return jId;
+}
+
+static cJSON* subplanToJson(const SSubplan* subplan) {
+  cJSON* jSubplan = cJSON_CreateObject();
+  if (NULL == jSubplan) {
+    return NULL;
+  }
+
+  // The 'type', 'level', 'execEpSet', 'pChildern' and 'pParents' fields do not need to be serialized.
+
+  bool res = addObject(jSubplan, "Id", subplanIdToJson, &subplan->id);
+  if (res) {
+    res = addObject(jSubplan, "Node", phyNodeToJson, subplan->pNode);
+  }
+
+  if (!res) {
+    cJSON_Delete(jSubplan);
+    return NULL;
+  }
+  return jSubplan;
+}
+
+int32_t subPlanToString(const SSubplan* subplan, char** str) {
+  cJSON* json = subplanToJson(subplan);
+  if (NULL == json) {
+    terrno = TSDB_CODE_TSC_OUT_OF_MEMORY;
+    return TSDB_CODE_FAILED;
+  }
+  *str = cJSON_Print(json);
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t stringToSubplan(const char* str, SSubplan** subplan) {
+  // todo
+  return TSDB_CODE_SUCCESS;
+}
diff --git a/source/libs/planner/src/planner.c b/source/libs/planner/src/planner.c
index 744a849e2d55e1293f35f2707acb000e3a8f4221..ee989234d53ebccdf823049b06ac35c79df3f20b 100644
--- a/source/libs/planner/src/planner.c
+++ b/source/libs/planner/src/planner.c
@@ -41,3 +41,11 @@ int32_t qCreateQueryDag(const struct SQueryStmtInfo* pQueryInfo, struct SEpSet*
   destroyQueryPlan(logicPlan);
   return TSDB_CODE_SUCCESS;
 }
+
+int32_t qSubPlanToString(const SSubplan *subplan, char** str) {
+  return subPlanToString(subplan, str);
+}
+
+int32_t qStringToSubplan(const char* str, SSubplan** subplan) {
+  return stringToSubplan(str, subplan);
+}