fix keep order in table scan is lost when remote read of PartitionTableScan (#7529) (#7536)

close #7519

Author: ti-chi-bot

dbms/src/Flash/Coprocessor/TiDBTableScan.cpp

@@ -27,7 +27,7 @@ TiDBTableScan::TiDBTableScan(
     // Only No-partition table need keep order when tablescan executor required keep order.
     // If keep_order is not set, keep order for safety.
     , keep_order(!is_partition_table_scan && (table_scan->tbl_scan().keep_order() || !table_scan->tbl_scan().has_keep_order()))
-    , is_fast_scan(table_scan->tbl_scan().is_fast_scan())
+    , is_fast_scan(is_partition_table_scan ? table_scan->partition_table_scan().is_fast_scan() : table_scan->tbl_scan().is_fast_scan())
 {
     if (is_partition_table_scan)
     {
@@ -75,6 +75,7 @@ void TiDBTableScan::constructTableScanForRemoteRead(tipb::TableScan * tipb_table
         for (auto id : partition_table_scan.primary_prefix_column_ids())
             tipb_table_scan->add_primary_prefix_column_ids(id);
         tipb_table_scan->set_is_fast_scan(partition_table_scan.is_fast_scan());
+        tipb_table_scan->set_keep_order(false);
     }
     else
     {