planner: the column type sent by tidb to tiflash is inconsistent with the column type of the table schema

[SeaRise]

Bug Report

Please answer these questions before submitting your issue. Thanks!

ref pingcap/tiflash#6806

1. Minimal reproduce step (Required)

create table if not exists test.t1(a int(11) DEFAULT NULL, id int(11) NOT NULL, PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */);
alter table test.t1 set tiflash replica 1;
use test; set tidb_enforce_mpp=on; set tidb_isolation_read_engines='tiflash';
explain select sum(1) as c from test.t1 having count(*)>1 or count(a)= null;
+--------------------------------+----------+-------------------+---------------+------------------------------------------------------------------+
| id                             | estRows  | task              | access object | operator info                                                    |
+--------------------------------+----------+-------------------+---------------+------------------------------------------------------------------+
| Projection_6                   | 0.80     | root              |               | Column#3                                                         |
| └─Selection_8                  | 0.80     | root              |               | or(gt(Column#4, 1), 0)                                           |
|   └─StreamAgg_26               | 1.00     | root              |               | funcs:sum(Column#12)->Column#3, funcs:count(Column#13)->Column#4 |
|     └─TableReader_27           | 1.00     | root              |               | data:StreamAgg_14                                                |
|       └─StreamAgg_14           | 1.00     | batchCop[tiflash] |               | funcs:sum(1)->Column#12, funcs:count(1)->Column#13               |
|         └─TableFullScan_25     | 10000.00 | batchCop[tiflash] | table:t1      | keep order:false, stats:pseudo                                   |
+--------------------------------+----------+-------------------+---------------+------------------------------------------------------------------+
select sum(1) as c from test.t1 having count(*)>1 or count(a)= null;

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

The col type sent by tidb is Int64, but it is Int32 in the table schema.

ERROR 1105 (HY000): Check schema[i].type->equals(*storage_schema[i].type) failed, schema[i].name = _tidb_rowid, schema[i].type->getName() = Int64, storage_schema[i].name = id, storage_schema[i].type->getName() = Int32

3. What did you see instead (Required)

The col type sent by tidb is Int32 and query success.

4. What is your TiDB version? (Required)

v7.2.0-alpha