fix(query): set correct schema info for normal table.

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

@@ -99,6 +99,38 @@ static int32_t saveOneRow(SArray* pRow, SSDataBlock* pBlock, SCacheRowsReader* p
   return TSDB_CODE_SUCCESS;
 }
 
+static int32_t setTableSchema(SCacheRowsReader* p, uint64_t suid, const char* idstr) {
+  int32_t numOfTables = p->numOfTables;
+
+  if (suid != 0) {
+    p->pSchema = metaGetTbTSchema(p->pVnode->pMeta, suid, -1, 1);
+    if (p->pSchema == NULL) {
+      taosMemoryFree(p);
+      tsdbWarn("stable:%" PRIu64 " has been dropped, failed to retrieve cached rows, %s", suid, idstr);
+      return TSDB_CODE_PAR_TABLE_NOT_EXIST;
+    }
+  } else {
+    for (int32_t i = 0; i < numOfTables; ++i) {
+      uint64_t uid = p->pTableList[i].uid;
+      p->pSchema = metaGetTbTSchema(p->pVnode->pMeta, uid, -1, 1);
+      if (p->pSchema != NULL) {
+        break;
+      }
+
+      tsdbWarn("table:%" PRIu64 " has been dropped, failed to retrieve cached rows, %s", uid, idstr);
+    }
+
+    // all queried tables have been dropped already, return immediately.
+    if (p->pSchema == NULL) {
+      taosMemoryFree(p);
+      tsdbWarn("all queried tables has been dropped, try next group, %s", idstr);
+      return TSDB_CODE_PAR_TABLE_NOT_EXIST;
+    }
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
 int32_t tsdbCacherowsReaderOpen(void* pVnode, int32_t type, void* pTableIdList, int32_t numOfTables, int32_t numOfCols,
                                 uint64_t suid, void** pReader, const char* idstr) {
   *pReader = NULL;
@@ -117,16 +149,15 @@ int32_t tsdbCacherowsReaderOpen(void* pVnode, int32_t type, void* pTableIdList,
     return TSDB_CODE_SUCCESS;
   }
 
-  p->pSchema = metaGetTbTSchema(p->pVnode->pMeta, suid, -1, 1);
-  if (p->pSchema == NULL) {
-    taosMemoryFree(p);
-    tsdbWarn("stable:%"PRIu64" has been dropped, failed to retrieve cached rows, %s", suid, idstr);
-    return TSDB_CODE_PAR_TABLE_NOT_EXIST;
-  }
-
   p->pTableList = pTableIdList;
   p->numOfTables = numOfTables;
 
+  int32_t code = setTableSchema(p, suid, idstr);
+  if (code != TSDB_CODE_SUCCESS) {
+    tsdbCacherowsReaderClose(p);
+    return code;
+  }
+
   p->transferBuf = taosMemoryCalloc(p->pSchema->numOfCols, POINTER_BYTES);
   if (p->transferBuf == NULL) {
     tsdbCacherowsReaderClose(p);