TiFlash join may got wrong result if fine grained join is enabled, and multiple join key has different types #59877
Description
Bug Report
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1. Minimal reproduce step (Required)
mysql> create table t1(id bigint, v1 int);
Query OK, 0 rows affected (0.04 sec)
mysql> create table t2(id bigint unsigned, v1 int);
Query OK, 0 rows affected (0.05 sec)
mysql> create table t3(id bigint, v1 int);
Query OK, 0 rows affected (0.05 sec)
mysql> insert into t1 values(10001, 1);
Query OK, 1 row affected (0.01 sec)
mysql> insert into t2 values(10001, 2);
Query OK, 1 row affected (0.00 sec)
mysql> insert into t3 values(10001, 3);
Query OK, 1 row affected (0.01 sec)
mysql> set tidb_broadcast_join_threshold_size=0;
Query OK, 0 rows affected (0.00 sec)
mysql> set tidb_broadcast_join_threshold_count=0;
Query OK, 0 rows affected (0.00 sec)
mysql> alter table t1 set tiflash replica 1;
Query OK, 0 rows affected (0.06 sec)
mysql> alter table t2 set tiflash replica 1;
Query OK, 0 rows affected (0.04 sec)
mysql> alter table t3 set tiflash replica 1;
Query OK, 0 rows affected (0.06 sec)
mysql> set tidb_enforce_mpp=1;
Query OK, 0 rows affected (0.01 sec)
mysql> set tiflash_fine_grained_shuffle_stream_count=0;
Query OK, 0 rows affected (0.00 sec)
mysql> select /*+ hash_join_build(t3) */ count(*) from t1 straight_join t2 on t1.id = t2.id straight_join t3 on t1.id = t3.id;
+----------+
| count(*) |
+----------+
| 0 |
+----------+
1 row in set (0.03 sec)
mysql> set tiflash_fine_grained_shuffle_stream_count=-1;
Query OK, 0 rows affected (0.00 sec)
mysql> select /*+ hash_join_build(t3) */ count(*) from t1 straight_join t2 on t1.id = t2.id straight_join t3 on t1.id = t3.id;
+----------+
| count(*) |
+----------+
| 1 |
+----------+
1 row in set (0.07 sec)