*: add a variable to control whether we can write _tidb_rowid #8218
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zimulala
added
type/bugfix
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/run-all-tests tidb-test=release-2.1 tidb-private-test=release-2.1 tikv=release-2.1 |
|
Please fix ci |
zz-jason
added
status/LGT2
zz-jason
approved these changes
Nov 8, 2018
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/run-all-tests |
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/run-all-tests tidb-test=release-2.1 tidb-private-test=release-2.1 tikv=release-2.1 |
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What problem does this PR solve?
create table tt(id binary(10), c int, primary key(id));
insert tt values (1, 10);
insert into tt (id, c, _tidb_rowid) values(30000,10,1);
tidb> select * from tt use index(
primary);+------------+------+
| id | c |
+------------+------+
| 30000 | 10 |
| 30000 | 10 |
+------------+------+
2 rows in set (0.00 sec)
tidb> select * from tt;
+------------+------+
| id | c |
+------------+------+
| 30000 | 10 |
+------------+------+
1 row in set (0.00 sec)
What is changed and how it works?
cherry-pick #8126