Row not found for Global Index during DeleteOnly state of Reorganize Partition

[mjonss]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Apply this patch:

diff --git a/pkg/ddl/tests/partition/multi_domain_test.go b/pkg/ddl/tests/partition/multi_domain_test.go
index 1c567c9a4a..3a17df219d 100644
--- a/pkg/ddl/tests/partition/multi_domain_test.go
+++ b/pkg/ddl/tests/partition/multi_domain_test.go
@@ -27,6 +27,28 @@ import (
        "go.uber.org/zap"
 )
 
+func TestMultiSchemaReorganizePartition(t *testing.T) {
+       createSQL := `create table t (a int primary key, b varchar(255), unique index idx_b_global (b) global) partition by range (a) (partition p1 values less than (200), partition pMax values less than (maxvalue))`
+       initFn := func(tkO *testkit.TestKit) {
+               tkO.MustExec(`insert into t values (1,1),(2,2)`)
+       }
+       alterSQL := `alter table t reorganize partition p1 into (partition p0 values less than (100), partition p1 values less than (200))`
+       loopFn := func(tkO, tkNO *testkit.TestKit) {
+               res := tkO.MustQuery(`select schema_state from information_schema.DDL_JOBS where table_name = 't' order by job_id desc limit 1`)
+               schemaState := res.Rows()[0][0].(string)
+               switch schemaState {
+               case model.StateDeleteOnly.String():
+                       tkNO.MustExec(`insert into t values (4,4)`)
+                       tkNO.MustQuery(`select * from t where b = "4"`).Sort().Check(testkit.Rows("4 4"))
+                       tkO.MustQuery(`select * from t where b = "4"`).Sort().Check(testkit.Rows("4 4"))
+               }
+       }
+       postFn := func(tkO *testkit.TestKit) {
+               // nothing
+       }
+       runMultiSchemaTest(t, createSQL, alterSQL, initFn, postFn, loopFn)
+}
+
 func TestMultiSchemaDropRangePartition(t *testing.T) {
        createSQL := `create table t (a int primary key, b varchar(255)) partition by range (a) (partition p0 values less than (100), partition p1 values less than (200))`
        initFn := func(tkO *testkit.TestKit) {

use make failpoint-enable and run the test.

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

test passing

3. What did you see instead (Required)

Read from the second SELECT did not return anything! I.e. the row "4 4" could not be found!

4. What is your TiDB version? (Required)

tidb_version(): Release Version: v8.4.0-alpha-463-ged9a909395
Edition: Community
Git Commit Hash: ed9a9093954f6636f8d3c9d09686069626e5b5ce
Git Branch: master
UTC Build Time: 2024-10-24 13:20:54
GoVersion: go1.23.2
Race Enabled: false
Check Table Before Drop: false
Store: unistore

[mjonss]

Would be fixed by #56382.