placement rule information lost after truncate partition

[tiancaiamao]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

CREATE PLACEMENT POLICY hisdata_ods_table_2constraints_1 LEADER_CONSTRAINTS="[+dc=nmlt]" FOLLOWER_CONSTRAINTS="{+dc=nmlt: 2}"

create table t1(id int ,name char(10),salary varchar(10));
create table t2(id int ,name char(10),salary int) partition by range (salary)(partition p1 values less than (5000),partition p2 values less than (10000));

alter table t1 placement policy hisdata_ods_table_2constraints_1;
alter table t2 placement policy hisdata_ods_table_2constraints_1;

with tmp as (select a.DB_NAME,a.TABLE_NAME,b.REGION_ID,b.PEER_ID,b.STORE_ID,b.IS_LEADER, c.LABEL->>'$[3]' as label from TIKV_REGION_STATUS a, TIKV_REGION_PEERS b, TIKV_STORE_STATUS c where a.REGION_ID=b.REGION_ID and b.STORE_ID=c.STORE_ID and a.db_name='test' and lower(a.table_name)='t2' group by a.DB_NAME,a.TABLE_NAME,b.REGION_ID, b.PEER_ID,b.STORE_ID,b.IS_LEADER,c.LABEL ), tmp1 as ( select a.db_name ,a.table_name ,sum(case when a.label->>'$.value' = 'nmlt' and a.is_leader then 1 else 0 end) sum_nmlt_leader ,sum(case when a.label->>'$.value' <> 'nmlt' and a.is_leader then 1 else 0 end) sum_nmdx_leader ,sum(case when a.label->>'$.value' = 'nmlt' then 1 else 0 end) sum_nmlt ,sum(case when a.label->>'$.value' <> 'nmlt' then 1 else 0 end) sum_nmdx from tmp a group by 1,2 ) select db_name,table_name,sum_nmlt_leader,sum_nmdx_leader,sum_nmlt,sum_nmdx, sum_nmlt/sum_nmdx from tmp1 order by 1,2;

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

truncate table test.t1;

alter table test.t2 truncate partition p2;

3. What did you see instead (Required)

I expect the placement rule work after truncate partition.
But as you can see, after truncate, the new partition does not obey the placement rule.

The root cause is that, the placement policy informaction is recored in the table info, not in the partition definition.
After truncate, the new partition inherit the placement policy from the partition definition, so it's lost.

See the ddl history info to verify that:

[bocs@vm10-2-103-13 ~]$ curl http://10.2.103.18:10084/ddl/history?limit=7
[
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4. What is your TiDB version? (Required)