MDEV-26693 ROW_NUMBER is wrong upon INSERT or UPDATE on Spider table

in case of a bulk insert the server sends all rows to the engine, and
then the engine replies that there was ER_DUP_ENTRY somewhere.

the exact number of the row that caused the error is unknown.

sql/sql_insert.cc

@@ -1158,8 +1158,13 @@ values_loop_end:
     table->file->ha_release_auto_increment();
     if (using_bulk_insert)
     {
-      if (unlikely(table->file->ha_end_bulk_insert()) &&
+      /*
-          !error)
+        if my_error() wasn't called yet on some specific row, end_bulk_insert()
+        can still do it, but the error shouldn't be for any specific row number
+      */
+      if (!error)
+        thd->get_stmt_da()->reset_current_row_for_warning(0);
+      if (unlikely(table->file->ha_end_bulk_insert()) && !error)
       {
         table->file->print_error(my_errno,MYF(0));
         error=1;

storage/spider/mysql-test/spider/r/error_row_number.result

@@ -0,0 +1,45 @@
+#
+# MDEV-26693 ROW_NUMBER is wrong upon INSERT or UPDATE on Spider table
+#
+for master_1
+for child2
+child2_1
+child2_2
+child2_3
+for child3
+child3_1
+child3_2
+child3_3
+connection child2_1;
+create database auto_test_remote;
+use auto_test_remote;
+create table ta_r (id int primary key);
+connection master_1;
+create table spd (id int primary key) $MASTER_1_ENGINE $MASTER_1_CHARSET $MASTER_1_COMMENT_2_1;
+insert into spd values (1),(2),(1);
+ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+get diagnostics condition 1 @n = row_number;
+select @n;
+@n
+0
+delete from spd;
+insert into spd values (1),(2),(3),(13);
+update spd set id = id + 10;
+ERROR 23000: Duplicate entry '13' for key 'PRIMARY'
+get diagnostics condition 1 @n = row_number;
+select @n;
+@n
+0
+drop table spd;
+connection child2_1;
+drop database auto_test_remote;
+connection master_1;
+for master_1
+for child2
+child2_1
+child2_2
+child2_3
+for child3
+child3_1
+child3_2
+child3_3

storage/spider/mysql-test/spider/t/error_row_number.test

@@ -0,0 +1,37 @@
+--echo #
+--echo # MDEV-26693 ROW_NUMBER is wrong upon INSERT or UPDATE on Spider table
+--echo #
+
+--disable_query_log
+--disable_result_log
+--source test_init.inc
+--enable_result_log
+--enable_query_log
+
+--connection child2_1
+create database auto_test_remote;
+use auto_test_remote;
+create table ta_r (id int primary key);
+
+--connection master_1
+evalp create table spd (id int primary key) $MASTER_1_ENGINE $MASTER_1_CHARSET $MASTER_1_COMMENT_2_1;
+
+--error ER_DUP_ENTRY
+insert into spd values (1),(2),(1);
+get diagnostics condition 1 @n = row_number;
+select @n;
+
+delete from spd;
+insert into spd values (1),(2),(3),(13);
+--error ER_DUP_ENTRY
+update spd set id = id + 10;
+get diagnostics condition 1 @n = row_number;
+select @n;
+
+drop table spd;
+--connection child2_1
+drop database auto_test_remote;
+--connection master_1
+--disable_query_log
+--disable_result_log
+--source test_deinit.inc