fix mem leak

src/client/src/tscPrepare.c

@@ -1384,8 +1384,11 @@ int taos_stmt_close(TAOS_STMT* stmt) {
     free(normal->parts);
     free(normal->sql);
   } else {
-    taosHashCleanup(pStmt->mtb.pTableHash);
-    taosHashCleanup(pStmt->mtb.pTableBlockHashList);
+    if (pStmt->multiTbInsert) {
+      taosHashCleanup(pStmt->mtb.pTableHash);
+      pStmt->mtb.pTableBlockHashList = tscDestroyBlockHashTable(pStmt->mtb.pTableBlockHashList, true);
+      taosHashCleanup(pStmt->pSql->cmd.pTableBlockHashList);
+    }
   }
 
   taos_free_result(pStmt->pSql);

tests/script/api/batchprepare.c

@@ -2050,6 +2050,8 @@ int sql_perf_s1(TAOS     *taos) {
     free(sql[i]);
   }
 
+  free(sql);
+
   return 0;
 }