[td-13039]add api for stream computing.

source/dnode/mnode/impl/CMakeLists.txt

@@ -6,7 +6,7 @@ target_include_directories(
     PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/inc"
 )
 target_link_libraries(
-    mnode scheduler sdb wal transport cjson sync monitor
+    mnode scheduler sdb wal transport cjson sync monitor parser
 )
 
 if(${BUILD_TEST})

source/dnode/mnode/impl/src/mndStream.c

@@ -14,6 +14,7 @@
  */
 
 #include "mndStream.h"
+#include "parser.h"
 #include "mndAuth.h"
 #include "mndDb.h"
 #include "mndDnode.h"
@@ -218,28 +219,6 @@ static int32_t mndCheckCreateStreamReq(SCMCreateStreamReq *pCreate) {
   return 0;
 }
 
-static SArray *mndExtractNamesFromAst(const SNode *pAst) {
-  if (pAst->type != QUERY_NODE_SELECT_STMT) return NULL;
-
-  SArray *names = taosArrayInit(0, sizeof(void *));
-  if (names == NULL) {
-    return NULL;
-  }
-  SSelectStmt *pSelect = (SSelectStmt *)pAst;
-  SNodeList   *pNodes = pSelect->pProjectionList;
-  SListCell   *pCell = pNodes->pHead;
-  while (pCell != NULL) {
-    if (pCell->pNode->type != QUERY_NODE_FUNCTION) {
-      continue;
-    }
-    SFunctionNode *pFunction = (SFunctionNode *)pCell->pNode;
-    char          *name = strdup(pFunction->node.aliasName);
-    taosArrayPush(names, &name);
-    pCell = pCell->pNext;
-  }
-  return names;
-}
-
 static int32_t mndStreamGetPlanString(const char *ast, char **pStr) {
   if (NULL == ast) {
     return TSDB_CODE_SUCCESS;
@@ -273,14 +252,16 @@ int32_t mndAddStreamToTrans(SMnode *pMnode, SStreamObj *pStream, const char *ast
     return -1;
   }
 #if 1
-  SArray *names = mndExtractNamesFromAst(pAst);
+  SSchemaWrapper sw = {0};
+  qExtractResultSchema(pAst, (int32_t*)&sw.nCols, &sw.pSchema);
+
   printf("|");
-  for (int i = 0; i < taosArrayGetSize(names); i++) {
-    printf(" %15s |", (char *)taosArrayGetP(names, i));
+  for (int i = 0; i < sw.nCols; i++) {
+    printf(" %15s |", (char *)sw.pSchema[i].name);
   }
   printf("\n=======================================================\n");
 
-  pStream->ColAlias = names;
+  pStream->ColAlias = NULL;
 #endif
 
   if (TSDB_CODE_SUCCESS != mndStreamGetPlanString(ast, &pStream->physicalPlan)) {

source/libs/parser/src/parTranslater.c

@@ -1696,24 +1696,27 @@ static int32_t translateSubquery(STranslateContext* pCxt, SNode* pNode) {
   return code;
 }
 
-static int32_t setReslutSchema(STranslateContext* pCxt, SQuery* pQuery) {
-  if (QUERY_NODE_SELECT_STMT == nodeType(pQuery->pRoot)) {
-    SSelectStmt* pSelect = (SSelectStmt*)pQuery->pRoot;
-    pQuery->numOfResCols = LIST_LENGTH(pSelect->pProjectionList);
-    pQuery->pResSchema = calloc(pQuery->numOfResCols, sizeof(SSchema));
-    if (NULL == pQuery->pResSchema) {
-      return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_OUT_OF_MEMORY);
+int32_t qExtractResultSchema(const SNode* pRoot, int32_t* numOfCols, SSchema** pSchema) {
+  if (QUERY_NODE_SELECT_STMT == nodeType(pRoot)) {
+    SSelectStmt* pSelect = (SSelectStmt*) pRoot;
+    *numOfCols = LIST_LENGTH(pSelect->pProjectionList);
+    *pSchema = calloc((*numOfCols), sizeof(SSchema));
+    if (NULL == (*pSchema)) {
+      return TSDB_CODE_OUT_OF_MEMORY;
     }
+
     SNode* pNode;
     int32_t index = 0;
     FOREACH(pNode, pSelect->pProjectionList) {
       SExprNode* pExpr = (SExprNode*)pNode;
-      pQuery->pResSchema[index].type = pExpr->resType.type;
-      pQuery->pResSchema[index].bytes = pExpr->resType.bytes;
-      strcpy(pQuery->pResSchema[index].name, pExpr->aliasName);
+      (*pSchema)[index].type = pExpr->resType.type;
+      (*pSchema)[index].bytes = pExpr->resType.bytes;
+      (*pSchema)[index].colId = index + 1;
+      strcpy((*pSchema)[index].name, pExpr->aliasName);
       index +=1;
     }
   }
+
   return TSDB_CODE_SUCCESS;
 }
 
@@ -2297,7 +2300,7 @@ static int32_t setQuery(STranslateContext* pCxt, SQuery* pQuery) {
       pQuery->haveResultSet = true;
       pQuery->directRpc = false;
       pQuery->msgType = TDMT_VND_QUERY;
-      code = setReslutSchema(pCxt, pQuery);
+      code = qExtractResultSchema(pQuery->pRoot, &pQuery->numOfResCols, &pQuery->pResSchema);
       break;
     case QUERY_NODE_VNODE_MODIF_STMT:
       pQuery->haveResultSet = false;