unionscan with parititon maybe cause panic

[wshwsh12]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

use test;
drop table t;
create table t(
c_int int(11)
) PARTITION BY RANGE COLUMNS(c_int) (
  PARTITION `p0` VALUES LESS THAN (2),
  PARTITION `p1` VALUES LESS THAN (4),
  PARTITION `p2` VALUES LESS THAN (6),
  PARTITION `p3` VALUES LESS THAN (8),
  PARTITION `p4` VALUES LESS THAN (10),
  PARTITION `p5` VALUES LESS THAN (20),
  PARTITION `p6` VALUES LESS THAN (50),
  PARTITION `p7` VALUES LESS THAN (1000000000)
);

begin;
insert into t values(38);
select /*+ hash_join(t) */ t.c_int from t , t as t1 where 
t.c_int = t1.c_int for update;
rollback;

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

+-------+
| c_int |
+-------+
|    38 |
+-------+

3. What did you see instead (Required)

ERROR 1105 (HY000): runtime error: index out of range [2] with length 2

Stack:

 [err="runtime error: index out of range [2] with length 2
github.com/pingcap/tidb/executor.recoveryProjection
        /home/wshwsh12/project/tidb/executor/projection.go:452
github.com/pingcap/tidb/executor.(*projectionInputFetcher).run.func1
        /home/wshwsh12/project/tidb/executor/projection.go:356
runtime.gopanic
        /usr/lib/go/src/runtime/panic.go:965
runtime.goPanicIndex
        /usr/lib/go/src/runtime/panic.go:88
github.com/pingcap/tidb/util/chunk.MutRow.SetDatum
        /home/wshwsh12/project/tidb/util/chunk/mutrow.go:287
github.com/pingcap/tidb/util/chunk.MutRow.SetDatums
        /home/wshwsh12/project/tidb/util/chunk/mutrow.go:281
github.com/pingcap/tidb/table/tables.(*partitionedTable).locateRangeColumnPartition.func1
        /home/wshwsh12/project/tidb/table/tables/partition.go:926
sort.Search
        /usr/lib/go/src/sort/search.go:66
github.com/pingcap/tidb/table/tables.(*partitionedTable).locateRangeColumnPartition
        /home/wshwsh12/project/tidb/table/tables/partition.go:925
github.com/pingcap/tidb/table/tables.(*partitionedTable).locatePartition
        /home/wshwsh12/project/tidb/table/tables/partition.go:906
github.com/pingcap/tidb/table/tables.(*partitionedTable).GetPartitionByRow
        /home/wshwsh12/project/tidb/table/tables/partition.go:1077
github.com/pingcap/tidb/executor.(*SelectLockExec).Next
        /home/wshwsh12/project/tidb/executor/executor.go:939
github.com/pingcap/tidb/executor.Next
        /home/wshwsh12/project/tidb/executor/executor.go:286
github.com/pingcap/tidb/executor.(*projectionInputFetcher).run
        /home/wshwsh12/project/tidb/executor/projection.go:380
runtime.goexit
        /usr/lib/go/src/runtime/asm_amd64.s:1371"]

4. What is your TiDB version? (Required)

master, 5.0, 4.0

[qw4990]

Duplicated with #20028.
The root cause is that partition table dynamic mode cannot support select for update now.

[ti-srebot]

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