enh: ins_table count optimize

source/libs/parser/src/parTranslater.c

@@ -47,6 +47,7 @@ typedef struct STranslateContext {
   SParseMetaCache* pMetaCache;
   bool             createStream;
   bool             stableQuery;
+  bool             showRewrite;
 } STranslateContext;
 
 typedef struct SFullDatabaseName {
@@ -2222,8 +2223,8 @@ static int32_t getVnodeSysTableVgroupListImpl(STranslateContext* pCxt, SName* pT
 
   if (TSDB_DB_NAME_T == pTargetName->type) {
     int32_t code = getDBVgInfoImpl(pCxt, pTargetName, pVgroupList);
-    if (TSDB_CODE_MND_DB_NOT_EXIST == code || TSDB_CODE_MND_DB_IN_CREATING == code ||
-        TSDB_CODE_MND_DB_IN_DROPPING == code) {
+    if (!pCxt->showRewrite && (TSDB_CODE_MND_DB_NOT_EXIST == code || TSDB_CODE_MND_DB_IN_CREATING == code ||
+                               TSDB_CODE_MND_DB_IN_DROPPING == code)) {
       // system table query should not report errors
       code = TSDB_CODE_SUCCESS;
     }
@@ -6294,6 +6295,7 @@ static int32_t rewriteShow(STranslateContext* pCxt, SQuery* pQuery) {
     code = createShowCondition((SShowStmt*)pQuery->pRoot, pStmt);
   }
   if (TSDB_CODE_SUCCESS == code) {
+    pCxt->showRewrite = true;
     pQuery->showRewrite = true;
     nodesDestroyNode(pQuery->pRoot);
     pQuery->pRoot = (SNode*)pStmt;
@@ -6347,6 +6349,7 @@ static int32_t rewriteShowStableTags(STranslateContext* pCxt, SQuery* pQuery) {
     code = createShowTableTagsProjections(&pSelect->pProjectionList, &pShow->pTags);
   }
   if (TSDB_CODE_SUCCESS == code) {
+    pCxt->showRewrite = true;
     pQuery->showRewrite = true;
     pSelect->tagScan = true;
     nodesDestroyNode(pQuery->pRoot);
@@ -6377,6 +6380,7 @@ static int32_t rewriteShowDnodeVariables(STranslateContext* pCxt, SQuery* pQuery
     }
   }
   if (TSDB_CODE_SUCCESS == code) {
+    pCxt->showRewrite = true;
     pQuery->showRewrite = true;
     nodesDestroyNode(pQuery->pRoot);
     pQuery->pRoot = (SNode*)pSelect;
@@ -6396,6 +6400,7 @@ static int32_t rewriteShowVnodes(STranslateContext* pCxt, SQuery* pQuery) {
     }
   }
   if (TSDB_CODE_SUCCESS == code) {
+    pCxt->showRewrite = true;
     pQuery->showRewrite = true;
     nodesDestroyNode(pQuery->pRoot);
     pQuery->pRoot = (SNode*)pStmt;
@@ -6437,6 +6442,7 @@ static int32_t rewriteShowTableDist(STranslateContext* pCxt, SQuery* pQuery) {
     code = nodesListMakeStrictAppend(&pStmt->pProjectionList, createBlockDistFunc());
   }
   if (TSDB_CODE_SUCCESS == code) {
+    pCxt->showRewrite = true;
     pQuery->showRewrite = true;
     nodesDestroyNode(pQuery->pRoot);
     pQuery->pRoot = (SNode*)pStmt;