enh(query): add new api.

source/libs/executor/inc/executorimpl.h

@@ -868,7 +868,7 @@ int32_t encodeOperator(SOperatorInfo* ops, char** data, int32_t *length);
  * length: the length of data
  * return: result code, 0 means success
  */
-int32_t decodeOperator(SOperatorInfo* ops, char* data, int32_t length);
+int32_t decodeOperator(SOperatorInfo* ops, const char* data, int32_t length);
 
 void    setTaskStatus(SExecTaskInfo* pTaskInfo, int8_t status);
 int32_t createExecTaskInfoImpl(SSubplan* pPlan, SExecTaskInfo** pTaskInfo, SReadHandle* pHandle, uint64_t taskId,

source/libs/executor/src/executorMain.c

@@ -219,4 +219,20 @@ int32_t qGetExplainExecInfo(qTaskInfo_t tinfo, int32_t *resNum, SExplainExecInfo
   return getOperatorExplainExecInfo(pTaskInfo->pRoot, pRes, &capacity, resNum);  
 }
 
+int32_t qSerializeTaskStatus(SExecTaskInfo* pTaskInfo, char** pOutput, int32_t* len) {
+  if (pTaskInfo->pRoot == NULL) {
+    return TSDB_CODE_INVALID_PARA;
+  }
+
+  return encodeOperator(pTaskInfo->pRoot, pOutput, len);
+}
+
+int32_t qDeserializeTaskStatus(SExecTaskInfo* pTaskInfo, const char* pInput, int32_t len) {
+  if (pTaskInfo == NULL || pInput == NULL || len == 0) {
+    return TSDB_CODE_INVALID_PARA;
+  }
+
+  return decodeOperator(pTaskInfo->pRoot, pInput, len);
+}
+
 

source/libs/executor/src/executorimpl.c

@@ -4515,15 +4515,17 @@ int32_t encodeOperator(SOperatorInfo* ops, char** result, int32_t* length) {
   return TDB_CODE_SUCCESS;
 }
 
-int32_t decodeOperator(SOperatorInfo* ops, char* result, int32_t length) {
+int32_t decodeOperator(SOperatorInfo* ops, const char* result, int32_t length) {
   int32_t code = TDB_CODE_SUCCESS;
   if (ops->fpSet.decodeResultRow) {
     if (result == NULL) {
       return TSDB_CODE_TSC_INVALID_INPUT;
     }
+
     ASSERT(length == *(int32_t*)result);
-    char* data = result + sizeof(int32_t);
-    code = ops->fpSet.decodeResultRow(ops, data);
+
+    const char* data = result + sizeof(int32_t);
+    code = ops->fpSet.decodeResultRow(ops, (char*) data);
     if (code != TDB_CODE_SUCCESS) {
       return code;
     }