Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Migrate contributor PRs with pending CLA #4125

Merged
merged 3 commits into from
Nov 2, 2020
Merged

Migrate contributor PRs with pending CLA #4125

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
44b6097
Update sql-logical-optimization.md
Joyinqin Nov 2, 2020
d36a444
Update system-variables.md
Joyinqin Nov 2, 2020
62c0893
Merge branch 'master' into cla-pendingprs
Joyinqin Nov 2, 2020
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion sql-logical-optimization.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ title: SQL Logical Optimization

# SQL Logical Optimization

This chapter explains some key logic rewrites to help you understand how TiDB generates the final query plan. For example, when you execute the `select * from t where t.a in (select * from t1 where t1.b=t.b)` query in TiDB, you will find that the `IN` sub-query `t.a in (select t1.a from t1 where t1.b=t.b` does not exist because TiDB has made some rewrites here.
This chapter explains some key logic rewrites to help you understand how TiDB generates the final query plan. For example, when you execute the `select * from t where t.a in (select t1.a from t1 where t1.b=t.b)` query in TiDB, you will find that the `IN` sub-query `t.a in (select t1.a from t1 where t1.b=t.b)` does not exist because TiDB has made some rewrites here.

This chapter introduces the following key rewrites:

Expand Down
2 changes: 1 addition & 1 deletion system-variables.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -688,7 +688,7 @@ set tidb_query_log_max_len = 20

### tidb_skip_isolation_level_check

- Scope: SESSION
- Scope: SESSION | GLOBAL
- Default value: 0
- After this switch is enabled, if an isolation level unsupported by TiDB is assigned to `tx_isolation`, no error is reported. This helps improve compatibility with applications that set (but do not depend on) a different isolation level.

Expand Down