tidb_wait_split_region_timeout don't work in pre-split region when create table

[crazycs520]

Bug Report

Please answer these questions before submitting your issue. Thanks!

Such as below SQL:

set @@global.tidb_scatter_region=1;
set @@tidb_wait_split_region_timeout=10;
create table t (a int, b int) partition by hash(a) partitions 100;

Set the tidb_wait_split_region_timeout value to 10 seconds, when create table, if pre-split and scatter region spend more than 10 seconds, the tidb_wait_split_region_timeout value does't take effect here.

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. Affected version (Required)

master, v4.0, v3.0

5. Root Cause Analysis