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CHANGELOGS: Add change logs for 2.1.0-rc.2 (#7705)
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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).

## [2.1.0-rc.2] - 2018-09-14
### SQL Optimizer
* Put forward a proposal of the next generation Planner [#7543](https://github.com/pingcap/tidb/pull/7543)
* Improve the optimization rules of constant propagation [#7276](https://github.com/pingcap/tidb/pull/7276)
* Enhance the computing logic of `Range` to enable it to handle multiple `IN` or `EQUAL` conditions simultaneously [#7577](https://github.com/pingcap/tidb/pull/7577)
* Fix the issue that the estimation result of `TableScan` is incorrect when `Range` is empty [#7583](https://github.com/pingcap/tidb/pull/7583)
* Support the `PointGet` operator for the `UPDATE` statement [#7586](https://github.com/pingcap/tidb/pull/7586)
* Fix the panic issue during the process of executing the `FirstRow` aggregate function in some conditions [#7624](https://github.com/pingcap/tidb/pull/7624)
### SQL Execution Engine
* Fix the potential `DataRace` issue when the `HashJoin` operator encounters an error [#7554](https://github.com/pingcap/tidb/pull/7554)
* Make the `HashJoin` operator read the inner table and build the hash table simultaneously [#7544](https://github.com/pingcap/tidb/pull/7544)
* Optimize the performance of Hash aggregate operators [#7541](https://github.com/pingcap/tidb/pull/7541)
* Optimize the performance of Join operators [#7493](https://github.com/pingcap/tidb/pull/7493), [#7433](https://github.com/pingcap/tidb/pull/7433)
* Fix the issue that the result of `UPDATE JOIN` is incorrect when the Join order is changed [#7571](https://github.com/pingcap/tidb/pull/7571)
* Improve the performance of Chunk’s iterator [#7585](https://github.com/pingcap/tidb/pull/7585)
### Statistics
* Fix the issue that the auto Analyze work repeatedly analyzes the statistics [#7550](https://github.com/pingcap/tidb/pull/7550)
* Fix the statistics update error that occurs when there is no statistics change [#7530](https://github.com/pingcap/tidb/pull/7530)
* Use the RC isolation level and low priority when building `Analyze` requests [#7496](https://github.com/pingcap/tidb/pull/7496)
* Support enabling statistics auto-analyze on certain period of a day [#7570](https://github.com/pingcap/tidb/pull/7570)
* Fix the panic issue when logging the statistics information [#7588](https://github.com/pingcap/tidb/pull/7588)
* Support configuring the number of buckets in the histogram using the `ANALYZE TABLE WITH BUCKETS` statement [#7619](https://github.com/pingcap/tidb/pull/7619)
* Fix the panic issue when updating an empty histogram [#7640](https://github.com/pingcap/tidb/pull/7640)
* Update `information_schema.tables.data_length` using the statistics information [#7657](https://github.com/pingcap/tidb/pull/7657)
### Server
* Add Trace related dependencies [#7532](https://github.com/pingcap/tidb/pull/7532)
* Enable the `mutex profile` feature of Golang [#7512](https://github.com/pingcap/tidb/pull/7512)
* The `Admin` statement requires the `Super_priv` privilege [#7486](https://github.com/pingcap/tidb/pull/7486)
* Forbid users to `Drop` crucial system tables [#7471](https://github.com/pingcap/tidb/pull/7471)
* Switch from `juju/errors` to `pkg/errors` [#7151](https://github.com/pingcap/tidb/pull/7151)
* Complete the functional prototype of SQL Tracing [#7016](https://github.com/pingcap/tidb/pull/7016)
* Remove the goroutine pool [#7564](https://github.com/pingcap/tidb/pull/7564)
* Support viewing the goroutine information using the `USER1` signal [#7587](https://github.com/pingcap/tidb/pull/7587)
* Set the internal SQL to high priority while TiDB is started [#7616](https://github.com/pingcap/tidb/pull/7616)
* Use different labels to filter internal SQL and user SQL in monitoring metrics [#7631](https://github.com/pingcap/tidb/pull/7631)
* Store the top 30 slow queries in the last week to the TiDB server [#7646](https://github.com/pingcap/tidb/pull/7646)
* Put forward a proposal of setting the global system time zone for the TiDB cluster [#7656](https://github.com/pingcap/tidb/pull/7656)
* Enrich the error message of “GC life time is shorter than transaction duration” [#7658](https://github.com/pingcap/tidb/pull/7658)
* Set the global system time zone when starting the TiDB cluster [#7638](https://github.com/pingcap/tidb/pull/7638)
### Compatibility
* Add the unsigned flag for the `Year` type [#7542](https://github.com/pingcap/tidb/pull/7542)
* Fix the issue of configuring the result length of the `Year` type in the `Prepare`/`Execute` mode [#7525](https://github.com/pingcap/tidb/pull/7525)
* Fix the issue of inserting zero timestamp in the `Prepare`/`Execute` mode [#7506](https://github.com/pingcap/tidb/pull/7506)
* Fix the error handling issue of the integer division [#7492](https://github.com/pingcap/tidb/pull/7492)
* Fix the compatibility issue when processing `ComStmtSendLongData` [#7485](https://github.com/pingcap/tidb/pull/7485)
* Fix the error handling issue during the process of converting string to integer [#7483](https://github.com/pingcap/tidb/pull/7483)
* Optimize the accuracy of values in the `information_schema.columns_in_table` table [#7463](https://github.com/pingcap/tidb/pull/7463)
* Fix the compatibility issue when writing or updating the string type of data using the MariaDB client [#7573](https://github.com/pingcap/tidb/pull/7573)
* Fix the compatibility issue of aliases of the returned value [#7600](https://github.com/pingcap/tidb/pull/7600)
* Fix the issue that the `NUMERIC_SCALE` value of the float type is incorrect in the `information_schema.COLUMNS` table [#7602](https://github.com/pingcap/tidb/pull/7602)
* Fix the issue that Parser reports an error when the single line comment is empty [#7612](https://github.com/pingcap/tidb/pull/7612)
### Expressions
* Check the value of `max_allowed_packet` in the `insert` function [#7528](https://github.com/pingcap/tidb/pull/7528)
* Support the built-in function `json_contains` [#7443](https://github.com/pingcap/tidb/pull/7443)
* Support the built-in function `json_contains_path` [#7596](https://github.com/pingcap/tidb/pull/7596)
* Support the built-in function `encode/decode` [#7622](https://github.com/pingcap/tidb/pull/7622)
* Fix the issue that some time related functions are not compatible with the MySQL behaviors in some cases [#7636](https://github.com/pingcap/tidb/pull/7636)
* Fix the compatibility issue of parsing the time type of data in string [#7654](https://github.com/pingcap/tidb/pull/7654)
* Fix the issue that the time zone is not considered when computing the default value of the `DateTime` data [#7655](https://github.com/pingcap/tidb/pull/7655)
### DML
* Set correct `last_insert_id` in the `InsertOnDuplicateUpdate` statement [#7534](https://github.com/pingcap/tidb/pull/7534)
* Reduce the cases of updating the `auto_increment_id` counter [#7515](https://github.com/pingcap/tidb/pull/7515)
* Optimize the error message of `Duplicate Key` [#7495](https://github.com/pingcap/tidb/pull/7495)
* Fix the `insert...select...on duplicate key update` issue [#7406](https://github.com/pingcap/tidb/pull/7406)
* Support the `LOAD DATA IGNORE LINES` statement [#7576](https://github.com/pingcap/tidb/pull/7576)
### DDL
* Add the DDL job type and the current schema version information in the monitor [#7472](https://github.com/pingcap/tidb/pull/7472)
* Complete the design of the `Admin Restore Table` feature [#7383](https://github.com/pingcap/tidb/pull/7383)
* Fix the issue that the default value of the `Bit` type exceeds 128 [#7249](https://github.com/pingcap/tidb/pull/7249)
* Fix the issue that the default value of the `Bit` type cannot be `NULL` [#7604](https://github.com/pingcap/tidb/pull/7604)
* Reduce the interval of checking `CREATE TABLE/DATABASE` in the DDL queue [#7608](https://github.com/pingcap/tidb/pull/7608)
* Use the `ddl/owner/resign` HTTP interface ro release the DDL owner and start electing a new owner [#7649](https://github.com/pingcap/tidb/pull/7649)
### TiKV Go Client
* Support the issue that the `Seek` operation only obtains `Key` [#7419](https://github.com/pingcap/tidb/pull/7419)
### [Table Partition](https://github.com/pingcap/tidb/projects/6) (Experimental)
* Fix the issue that the `Bigint` type cannot be used as the partition key [#7520](https://github.com/pingcap/tidb/pull/7520)
* Support the rollback operation when an issue occurs during adding an index in the partitioned table [#7437](https://github.com/pingcap/tidb/pull/7437)


## [2.0.0-rc.5] - 2018-04-17
### New Features
* Support showing memory usage of the executing statements in the `SHOW PROCESSLIST` statement
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* Support more `SQL_MODE`
* Optimize the `Load Data` performance to increase the speed by 10 times
* Optimize the `Use Database` performance
* Support statistics on the memory usage of physical operators
* Support statistics on the memory usage of physical operators

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