add dag serialize and deserialize

include/libs/planner/planner.h

@@ -21,6 +21,7 @@ extern "C" {
 #endif
 
 #include "tmsg.h"
+#include "tarray.h"
 
 #define QUERY_TYPE_MERGE       1
 #define QUERY_TYPE_PARTIAL     2
@@ -158,6 +159,8 @@ int32_t qStringToSubplan(const char* str, SSubplan** subplan);
 
 void qDestroySubplan(SSubplan* pSubplan);
 
+char* qDagSerialize(const SQueryDag* pDag);
+
 /**
  * Destroy the physical plan.
  * @param pQueryPhyNode
@@ -165,8 +168,11 @@ void qDestroySubplan(SSubplan* pSubplan);
  */
 void qDestroyQueryDag(SQueryDag* pDag);
 
+char* qDagToString(const SQueryDag* pDag);
+SQueryDag* qStringToDag(const char* pStr);
+
 #ifdef __cplusplus
 }
 #endif
 
-#endif /*_TD_PLANNER_H_*/
\ No newline at end of file
+#endif /*_TD_PLANNER_H_*/

source/libs/planner/src/physicalPlanJson.c

@@ -857,3 +857,53 @@ int32_t stringToSubplan(const char* str, SSubplan** subplan) {
   *subplan = subplanFromJson(json);
   return (NULL == *subplan ? TSDB_CODE_FAILED : TSDB_CODE_SUCCESS);
 }
+
+cJSON* qDagToJson(const SQueryDag* pDag) {
+  cJSON* pRoot = cJSON_CreateObject();
+  cJSON_AddNumberToObject(pRoot, "numOfSubplans", pDag->numOfSubplans);
+  cJSON_AddNumberToObject(pRoot, "queryId", pDag->queryId);
+  cJSON *pLevels = cJSON_CreateArray();
+  cJSON_AddItemToObject(pRoot, "pSubplans", pLevels);
+  size_t level = taosArrayGetSize(pDag->pSubplans);
+  for(size_t i = 0; i < level; i++) {
+    const SArray* pSubplans = (const SArray*)taosArrayGetP(pDag->pSubplans, i);
+    size_t num = taosArrayGetSize(pSubplans);
+    cJSON* plansOneLevel = cJSON_CreateArray();
+    cJSON_AddItemToArray(pLevels, plansOneLevel);
+    for(size_t j = 0; j < num; j++) {
+      cJSON* pSubplan = subplanToJson((const SSubplan*)taosArrayGetP(pSubplans, j));
+      cJSON_AddItemToArray(plansOneLevel, pSubplan);
+    }
+  }
+  return pRoot;
+}
+
+char* qDagToString(const SQueryDag* pDag) {
+  cJSON* pRoot = qDagToJson(pDag);
+  return cJSON_Print(pRoot);
+}
+
+SQueryDag* qJsonToDag(const cJSON* pRoot) {
+  SQueryDag* pDag = malloc(sizeof(SQueryDag));
+  if(pDag == NULL) {
+    return NULL;
+  }
+  pDag->numOfSubplans = cJSON_GetNumberValue(cJSON_GetObjectItem(pRoot, "numOfSubplans"));
+  pDag->pSubplans = taosArrayInit(0, sizeof(SArray));
+  cJSON* pLevels = cJSON_GetObjectItem(pRoot, "numOfSubplans");
+  int level = cJSON_GetArraySize(pLevels);
+  for(int i = 0; i < level; i++) {
+    cJSON* pItem = cJSON_GetArrayItem(pLevels, i);
+    int sz = cJSON_GetArraySize(pItem);
+    for(int j = 0; j < sz; j++) {
+      cJSON* pSubplanJson = cJSON_GetArrayItem(pItem, j);
+      SSubplan* pSubplan = subplanFromJson(pSubplanJson);
+    } 
+  }
+  return NULL;
+}
+
+SQueryDag* qStringToDag(const char* pStr) {
+  cJSON* pRoot = cJSON_Parse(pStr);
+  return qJsonToDag(pRoot);
+}