code optimization

src/tsdb/src/tsdbMain.c

@@ -714,10 +714,11 @@ static int tsdbRestoreLastColumns(STsdbRepo *pRepo, STable *pTable, SReadH* pRea
 
     // file block with sub-blocks has no statistics data
     if (pBlock->numOfSubBlocks <= 1) {
-      tsdbLoadBlockStatis(pReadh, pBlock);
+      if (tsdbLoadBlockStatis(pReadh, pBlock) == TSDB_STATIS_OK) {
         tsdbGetBlockStatis(pReadh, pBlockStatis, (int)numColumns, pBlock);
         loadStatisData = true;
       }
+    }
 
     for (int16_t i = 0; i < numColumns && numColumns > pTable->restoreColumnNum; ++i) {
       STColumn *pCol = schemaColAt(pSchema, i);