fix:<TD-18803> taosX core dump if schema is null

include/common/tcommon.h

@@ -184,7 +184,6 @@ typedef struct SQueryTableDataCond {
   STimeWindow  twindows;
   int64_t      startVersion;
   int64_t      endVersion;
-  int64_t      schemaVersion;
 } SQueryTableDataCond;
 
 int32_t tEncodeDataBlock(void** buf, const SSDataBlock* pBlock);

source/client/src/taosx.c

@@ -765,6 +765,7 @@ static int32_t taosCreateTable(TAOS* taos, void* meta, int32_t metaLen) {
     }
     taosArrayPush(pRequest->tableList, &pName);
 
+    pCreateReq->flags |= TD_CREATE_IF_NOT_EXISTS;
     // change tag cid to new cid
     if(pCreateReq->type == TSDB_CHILD_TABLE){
       STableMeta* pTableMeta = NULL;

source/dnode/vnode/src/meta/metaQuery.c

@@ -280,6 +280,38 @@ _query:
       tDecoderClear(&dc);
       goto _exit;
     }
+    { // Traverse to find the previous qualified data
+      TBC      *pCur;
+      tdbTbcOpen(pMeta->pTbDb, &pCur, NULL);
+      STbDbKey key = {.version = sver, .uid = INT64_MAX};
+      int c = 0;
+      tdbTbcMoveTo(pCur, &key, sizeof(key), &c);
+      if(c < 0){
+        tdbTbcMoveToPrev(pCur);
+      }
+
+      void *pKey = NULL;
+      void *pVal = NULL;
+      int   vLen = 0, kLen = 0;
+      while(1){
+        int32_t ret = tdbTbcPrev(pCur, &pKey, &kLen, &pVal, &vLen);
+        if (ret < 0) break;
+
+        STbDbKey *tmp = (STbDbKey*)pKey;
+        if(tmp->uid != uid){
+          continue;
+        }
+        SDecoder   dcNew = {0};
+        SMetaEntry meNew = {0};
+        tDecoderInit(&dcNew, pVal, vLen);
+        metaDecodeEntry(&dcNew, &meNew);
+        pSchema = tCloneSSchemaWrapper(&meNew.stbEntry.schemaRow);
+        tDecoderClear(&dcNew);
+        tdbTbcClose(pCur);
+        goto _exit;
+      }
+      tdbTbcClose(pCur);
+    }
   } else if (me.type == TSDB_CHILD_TABLE) {
     uid = me.ctbEntry.suid;
     tDecoderClear(&dc);

source/dnode/vnode/src/tsdb/tsdbRead.c

@@ -3349,10 +3349,10 @@ int32_t tsdbReaderOpen(SVnode* pVnode, SQueryTableDataCond* pCond, SArray* pTabl
   }
 
   if (pCond->suid != 0) {
-    pReader->pSchema = metaGetTbTSchema(pReader->pTsdb->pVnode->pMeta, pReader->suid, pCond->schemaVersion);
+    pReader->pSchema = metaGetTbTSchema(pReader->pTsdb->pVnode->pMeta, pReader->suid, pCond->endVersion);
   } else if (taosArrayGetSize(pTableList) > 0) {
     STableKeyInfo* pKey = taosArrayGet(pTableList, 0);
-    pReader->pSchema = metaGetTbTSchema(pReader->pTsdb->pVnode->pMeta, pKey->uid, pCond->schemaVersion);
+    pReader->pSchema = metaGetTbTSchema(pReader->pTsdb->pVnode->pMeta, pKey->uid, pCond->endVersion);
   }
 
   int32_t numOfTables = taosArrayGetSize(pTableList);

source/libs/executor/src/executil.c

@@ -1300,7 +1300,6 @@ int32_t initQueryTableDataCond(SQueryTableDataCond* pCond, const STableScanPhysi
   pCond->type = TIMEWINDOW_RANGE_CONTAINED;
   pCond->startVersion = -1;
   pCond->endVersion = -1;
-  pCond->schemaVersion = -1;
   //  pCond->type = pTableScanNode->scanFlag;
 
   int32_t j = 0;

source/libs/executor/src/executor.c

@@ -729,7 +729,6 @@ int32_t initQueryTableDataCondForTmq(SQueryTableDataCond* pCond, SSnapContext* s
   pCond->type = TIMEWINDOW_RANGE_CONTAINED;
   pCond->startVersion = -1;
   pCond->endVersion = sContext->snapVersion;
-  pCond->schemaVersion = sContext->snapVersion;
 
   for (int32_t i = 0; i < pCond->numOfCols; ++i) {
     pCond->colList[i].type = mtInfo.schema->pSchema[i].type;

source/libs/executor/src/executorimpl.c

@@ -3908,7 +3908,6 @@ static int32_t initTableblockDistQueryCond(uint64_t uid, SQueryTableDataCond* pC
   pCond->type = TIMEWINDOW_RANGE_CONTAINED;
   pCond->startVersion = -1;
   pCond->endVersion = -1;
-  pCond->schemaVersion = -1;
 
   return TSDB_CODE_SUCCESS;
 }