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CHANGELOG: pick changelog from v2.1.4 to v.2.1.7 (pingcap#9942)
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# TiDB Changelog
All notable changes to this project will be documented in this file. See also [Release Notes](https://github.com/pingcap/docs/blob/master/releases/rn.md), [TiKV Changelog](https://github.com/tikv/tikv/blob/master/CHANGELOG.md) and [PD Changelog](https://github.com/pingcap/pd/blob/master/CHANGELOG.md).

## [2.1.7] 2019-03-27

* Fix the issue of longer startup time when upgrading the program caused by canceling DDL operations [#9768](https://github.com/pingcap/tidb/pull/9768)
* Fix the issue that the `check-mb4-value-in-utf8` configuration item is in the wrong position in the `config.example.toml` file [#9852](https://github.com/pingcap/tidb/pull/9852)
* Improve the compatibility of the `str_to_date` built-in function with MySQL [#9817](https://github.com/pingcap/tidb/pull/9817)
* Fix the compatibility issue of the `last_day` built-in function [#9750](https://github.com/pingcap/tidb/pull/9750)
* Add the `tidb_table_id` column for `infoschema.tables` to facilitate getting `table_id` by using SQL statements and add the `tidb_indexes` system table to manage the relationship between Table and Index [#9862](https://github.com/pingcap/tidb/pull/9862)
* Add a check about the null definition of Table Partition [#9663](https://github.com/pingcap/tidb/pull/9663)
* Change the privileges required by `Truncate Table` from `Delete` to `Drop` to make it consistent with MySQL [#9876](https://github.com/pingcap/tidb/pull/9876)
* Support using subqueries in the `DO` statement [#9877](https://github.com/pingcap/tidb/pull/9877)
* Fix the issue that the `default_week_format` variable does not take effect in the `week` function [#9753](https://github.com/pingcap/tidb/pull/9753)
* Support the plugin framework [#9880](https://github.com/pingcap/tidb/pull/9880), [#9888](https://github.com/pingcap/tidb/pull/9888)
* Support checking the enabling state of binlog by using the `log_bin` system variable [#9634](https://github.com/pingcap/tidb/pull/9634)
* Support checking the Pump/Drainer status by using SQL statements [#9896](https://github.com/pingcap/tidb/pull/9896)
* Fix the compatibility issue about checking mb4 character on utf8 when upgrading TiDB [#9887](https://github.com/pingcap/tidb/pull/9887)

## [3.0.0-beta.1] - 2019-03-26

### SQL Optimizer
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* Support the `SHOW CREATE VIEW` statement [#9309](https://github.com/pingcap/tidb/pull/9309)
* Support the `SHOW CREATE USER` statement [#9240](https://github.com/pingcap/tidb/pull/9240)

## [2.1.6] 2019-03-15

### SQL Optimizer/Executor
* Optimize planner to select the outer table based on cost when both tables are specified in Hint of `TIDB_INLJ` [#9615](https://github.com/pingcap/tidb/pull/9615)
* Fix the issue that `IndexScan` cannot be selected correctly in some cases
[#9587](https://github.com/pingcap/tidb/pull/9587)
* Fix incompatibility with MySQL of check in the `agg` function in subqueries [#9551](https://github.com/pingcap/tidb/pull/9551)
* Make `show stats_histograms` only output valid columns to avoid panics
[#9502](https://github.com/pingcap/tidb/pull/9502)
### Server
* Support the `log_bin` variable to enable/disable Binlog [#9634](https://github.com/pingcap/tidb/pull/9634)
* Add a sanity check for transactions to avoid false transaction commit [#9559](https://github.com/pingcap/tidb/pull/9559)
* Fix the issue that setting variables may lead to panic [#9539](https://github.com/pingcap/tidb/pull/9539)

### DDL
* Fix the issue that the `Create Table Like` statement causes panic in some cases [#9652](https://github.com/pingcap/tidb/pull/9652)
* Enable the `AutoSync` feature of etcd clients to avoid connection issues between TiDB and etcd in some cases [#9600](https://github.com/pingcap/tidb/pull/9600)


## [2.1.5] 2019-02-28

### SQL Optimizer/Executor
* Make `SHOW CREATE TABLE` do not print the column charset information when the charset information of a column is the same with that of a table, to improve the compatibility of `SHOW CREATE TABLE` with MySQL [#9306](https://github.com/pingcap/tidb/pull/9306)
* Fix the panic or the wrong result of the `Sort` operator in some cases by extracting `ScalarFunc` from `Sort` to a `Projection` operator for computing to simplify the computing logic of `Sort` [#9319](https://github.com/pingcap/tidb/pull/9319)
* Remove the sorting field with constant values in the `Sort` operator [#9335](https://github.com/pingcap/tidb/pull/9335), [#9440](https://github.com/pingcap/tidb/pull/9440)
* Fix the data overflow issue when inserting data into an unsigned integer column [#9339](https://github.com/pingcap/tidb/pull/9339)
* Set `cast_as_binary` to `NULL` when the length of the target binary exceeds `max_allowed_packet` [#9349](https://github.com/pingcap/tidb/pull/9349)
* Optimize the constant folding process of `IF` and `IFNULL` [#9351](https://github.com/pingcap/tidb/pull/9351)
* Optimize the index selection of TiDB using skyline pruning to improve the stability of simple queries [#9356](https://github.com/pingcap/tidb/pull/9356)
* Support computing the selectivity of the `DNF` expression [#9405](https://github.com/pingcap/tidb/pull/9405)
* Fix the wrong SQL query result of `!=ANY()` and `=ALL()` in some cases [#9403](https://github.com/pingcap/tidb/pull/9403)
* Fix the panic or the wrong result when the Join Key types of two tables on which the `Merge Join` operation is performed are different [#9438](https://github.com/pingcap/tidb/pull/9438)
* Fix the issue that the result of the `RAND()` function is not compatible with MySQL [#9446](https://github.com/pingcap/tidb/pull/9446)
* Refactor the logic of `Semi Join` processing `NULL` and the empty result set to get the correct result and improve the compatibility with MySQL [#9449](https://github.com/pingcap/tidb/pull/9449)

### Server
* Add the `tidb_constraint_check_in_place` system variable to check the data uniqueness constraint when executing the `INSERT` statement [#9401](https://github.com/pingcap/tidb/pull/9401)
* Fix the issue that the value of the `tidb_force_priority` system variable is different from that set in the configuration file [#9347](https://github.com/pingcap/tidb/pull/9347)
* Add the `current_db` field in general logs to print the name of the currently used database [#9346](https://github.com/pingcap/tidb/pull/9346)
* Add an HTTP API of obtaining the table information with the table ID [#9408](https://github.com/pingcap/tidb/pull/9408)
* Fix the issue that `LOAD DATA` loads incorrect data in some cases [#9414](https://github.com/pingcap/tidb/pull/9414)
* Fix the issue that it takes a long time to build a connection between the MySQL client and TiDB in some cases [#9451](https://github.com/pingcap/tidb/pull/9451)

### DDL
* Fix some issues when canceling the `DROP COLUMN` operation [#9352](https://github.com/pingcap/tidb/pull/9352)
* Fix some issues when canceling the `DROP` or `ADD` partitioned table operation [#9376](https://github.com/pingcap/tidb/pull/9376)
* Fix the issue that `ADMIN CHECK TABLE` mistakenly reports the data index inconsistency in some cases [#9399](https://github.com/pingcap/tidb/pull/9399)
* Fix the time zone issue of the `TIMESTAMP` default value [#9108](https://github.com/pingcap/tidb/pull/9108)

## [2.1.4] 2019-02-15

### SQL Optimizer/Executor

* Fix the issue that the `VALUES` function does not handle the FLOAT type correctly [#9223](https://github.com/pingcap/tidb/pull/9223)
* Fix the wrong result issue when casting Float to String in some cases [#9227](https://github.com/pingcap/tidb/pull/9227)
* Fix the wrong result issue of the `FORMAT` function in some cases [#9235](https://github.com/pingcap/tidb/pull/9235)
* Fix the panic issue when handling the Join query in some cases [#9264](https://github.com/pingcap/tidb/pull/9264)
* Fix the issue that the `VALUES` function does not handle the ENUM type correctly [#9280](https://github.com/pingcap/tidb/pull/9280)
* Fix the wrong result issue of `DATE_ADD` / `DATE_SUB` in some cases [#9284](https://github.com/pingcap/tidb/pull/9284)

### Server

* Optimize the "reload privilege success" log and change it to the DEBUG level [#9274](https://github.com/pingcap/tidb/pull/9274)

### DDL

* Change `tidb_ddl_reorg_worker_cnt` and `tidb_ddl_reorg_batch_size` to global variables [#9134](https://github.com/pingcap/tidb/pull/9134)
* Fix the bug caused by adding an index to a generated column in some abnormal conditions [#9289](https://github.com/pingcap/tidb/pull/9289)

## [2.1.3] 2019-01-25

### SQL Optimizer/Executor
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