enh: support no from subquery (#34119)

Author: dapan1121

source/libs/nodes/src/nodesTraverseFuncs.c

@@ -564,6 +564,7 @@ void nodesWalkSelectStmtImpl(SSelectStmt* pSelect, ESqlClause clause, FNodeWalke
       nodesWalkExprs(pSelect->pPartitionByList, walker, pContext);
     case SQL_CLAUSE_PARTITION_BY:
       nodesWalkExpr(pSelect->pWindow, walker, pContext);
+      nodesWalkExpr(pSelect->pFill, walker, pContext);
     case SQL_CLAUSE_WINDOW:
       if (NULL != pSelect->pWindow) {
         if (QUERY_NODE_INTERVAL_WINDOW == nodeType(pSelect->pWindow)) {

source/libs/parser/src/parAstParser.c

@@ -19317,11 +19317,13 @@ static int32_t translateTableSubquery(STranslateContext* pCxt, SNode* pNode) {
   ESqlClause currClause = pCxt->currClause;
   SNode*     pCurrStmt = pCxt->pCurrStmt;
   int32_t    currLevel = pCxt->currLevel;
+  bool       dual = pCxt->dual;
   pCxt->currLevel = ++(pCxt->levelNo);
   code = translateQuery(pCxt, pNode);
   pCxt->currClause = currClause;
   pCxt->pCurrStmt = pCurrStmt;
   pCxt->currLevel = currLevel;
+  pCxt->dual = dual;
 
   return code;
 }
@@ -19357,11 +19359,13 @@ static int32_t translateExprSubqueryImpl(STranslateContext* pCxt, SNode* pNode)
     parserError("Correlated subQuery not supported now");
     code = TSDB_CODE_PAR_INVALID_SCALAR_SUBQ;
   }
+/*  
   if (pCxt->hasLocalSubQ) {
     parserError("Only query with FROM supported now");
     code = TSDB_CODE_PAR_INVALID_SCALAR_SUBQ;
   }
-    
+*/
+
   return code;
 }
 

source/libs/parser/src/parTranslater.c

@@ -73,6 +73,14 @@ static void dumpLogicPlan(SLogicSubplan* pLogicSubplan, int32_t level) {
   return;
 }
 
+static void initSubQueryPlanContext(SPlanContext* pDst, SPlanContext* pSrc, SNode* pRoot) {
+  memcpy(pDst, pSrc, sizeof(*pSrc));
+
+  pDst->withExtWindow = false;
+  pDst->hasScan = false;
+  
+  pDst->pAstRoot = pRoot;
+}
 
 static int32_t createSubQueryPlans(SPlanContext* pSrc, SQueryPlan* pParent, SArray* pExecNodeList) {
   int32_t code = TSDB_CODE_SUCCESS, lino = 0;
@@ -110,8 +118,7 @@ static int32_t createSubQueryPlans(SPlanContext* pSrc, SQueryPlan* pParent, SArr
   }
 
   FOREACH(pNode, pSubQueries) {
-    memcpy(&ctx, pSrc, sizeof(*pSrc));
-    ctx.pAstRoot = pNode;
+    initSubQueryPlanContext(&ctx, pSrc, pNode);
     TAOS_CHECK_EXIT(qCreateQueryPlan(&ctx, &pPlan, pExecNodeList));
     TAOS_CHECK_EXIT(nodesListMakeStrictAppend(&pParent->pChildren, (SNode*)pPlan));
     pParent->numOfSubplans += pPlan->numOfSubplans;