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CHANGELOG.md

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TiDB Changelog

All notable changes to this project will be documented in this file. See also Release Notes, TiKV Changelog and PD Changelog.

[2.0.0-rc.5] - 2018-04-17

New Features

  • Support showing memory usage of the executing statements in the SHOW PROCESSLIST statement
  • Support setting the table comment using the Alter statement

Improvements

  • Clean up the written data while rolling back the Add Index operation, to reduce consumed space
  • Optimize the insert on duplicate key update statement to improve the performance by 10 times

Bug Fixes

  • Fix the issue about applying the Top-N pushdown rule
  • Fix the issue that Alter Table Modify Column reports an error in extreme conditions
  • Fix the issue about the type of the results returned by the UNIX_TIMESTAMP function
  • Fix the issue that the NULL value is inserted while adding NOT NULL columns
  • Fix the estimation of the number of rows for the columns that contain NULL values
  • Fix the zero value of the Binary type
  • Fix the BatchGet issue within a transaction

[2.0.0-rc.4] - 2018-04-01

New Features

  • Support SHOW GRANTS FOR CURRENT_USER();
  • Support the SET TRANSACTION syntax
  • Support displaying floating point numbers using scientific notation

Improvements

  • Improve the execution performance of DecodeBytes
  • Optimize LIMIT 0 to TableDual, to avoid building useless execution plans

Bug Fixes

  • Fix the issue that the Expression in UnionScan is not cloned
  • Fix the potential goroutine leak issue in copIterator
  • Fix the issue that admin check table misjudges the unique index including null
  • Fix the type inference issue during binary literal computing
  • Fix the issue in parsing the CREATE VIEW statement
  • Fix the panic issue when one statement contains both ORDER BY and LIMIT 0

[2.0.0-rc.3] - 2018-03-23

New Features

  • Support closing the Join Reorder optimization in the optimizer using STRAIGHT_JOIN
  • Output more detailed status information of DDL jobs in ADMIN SHOW DDL JOBS
  • Support querying the original statements of currently running DDL jobs using ADMIN SHOW DDL JOB QUERIES
  • Support recovering the index data using ADMIN RECOVER INDEX for disaster recovery
  • Attach a lower priority to the ADD INDEX operation to reduce the impact on online business
  • Support aggregation functions with JSON type parameters, such as SUM/AVG
  • Support modifying the lower_case_table_names system variable in the configuration file, to support the OGG data synchronization tool
  • Support using implicit RowID in CRUD operations

Improvements

  • Improve compatibility with the Navicat management tool
  • Use the Stream Aggregation operator when the GROUP BY clause is empty, to increase the speed
  • Optimize the execution speed of ADD INDEX to greatly increase the speed in some scenarios
  • Optimize checks on length and precision of the floating point type, to improve compatibility with MySQL
  • Improve the parsing error log of time type and add more error information
  • Improve memory control and add statistics about IndexLookupExecutor memory

Bug Fixes

  • Fix the wrong result issue of MAX/MIN in some scenarios
  • Fix the issue that the result of Sort Merge Join does not show in order of Join Key in some scenarios
  • Fix the error of comparison between uint and int in boundary conditions

[2.0.0-rc.2] - 2018-03-15

Only TiKV has this release

[2.0.0-rc.1] - 2018-03-09

New Features

  • Support limiting the memory usage by a single SQL statement, to reduce the risk of OOM
  • Support pushing the Stream Aggregate operator down to TiKV
  • Support validating the configuration file
  • Support obtaining the information of TiDB configuration through HTTP API

Improvements

  • Improve the compatibility with Navicat
  • Improve the optimizer and extract common expressions with multiple OR conditions, to choose better query plan
  • Improve the optimizer and convert subqueries to Join operators in more scenarios, to choose better query plan
  • Compatible with more MySQL syntax in Parser
  • Resolve Lock in the Batch mode to increase the garbage collection speed
  • Optimize the Add Index operation and give lower priority to all write and read operations, to reduce the impact on online business

Bug Fixes

  • Fix the length of Boolean field to improve compatibility

[1.1.0-beta] - 2018-02-24

New Features

  • Add more monitoring metrics and refine the log
  • Add the tidb_config session variable to output the current TiDB configuration
  • Support displaying the table creating time in information_schema

Improvements

  • Compatible with more MySQL syntax
  • Optimize queries containing the MaxOneRow operator
  • Configure the size of intermediate result sets generated by Join, to further reduce the memory used by Join
  • Optimize the query performance of the SQL engine to improve the test result of the Sysbench Select/OLTP by 10%
  • Improve the computing speed of subqueries in the optimizer using the new execution engine; compared with TiDB 1.0, TiDB 1.1 Beta has great improvement in tests like TPC-H and TPC-DS

Bug Fixes

  • Fix the panic issue in the Union and Index Join operators
  • Fix the wrong result issue of the Sort Merge Join operator in some scenarios
  • Fix the issue that the Show Index statement shows indexes that are in the process of adding
  • Fix the failure of the Drop Stats statement

[1.0.8] - 2018-02-11

New Features

  • Add limitation (Configurable, the default value is 5000) to the DML statements number within a transaction

Improvements

  • Improve the stability of the GC process by ignoring the regions with GC errors
  • Run GC concurrently to accelerate the GC process
  • Provide syntax support for the CREATE INDEX statement
  • Optimize the performance of the InsertIntoIgnore statement

Bug Fixes

  • Fix issues in the Outer Join result in some scenarios
  • Fix the issue in the ShardRowID option
  • Fix an issue in the Table/Column aliases returned by the Prepare statement
  • Fix an issue in updating statistics delta
  • Fix a panic error in the Drop Column statement
  • Fix an DML issue when running the Add Column After statement

[1.0.7] - 2018-01-22

Improvements

  • Optimize the FIELD_LIST command
  • Fix data race of the information schema
  • Avoid adding read-only statements to history
  • Add the session variable to control the log query
  • Add schema info API for the http status server
  • Update the behavior when RunWorker is false in DDL
  • Improve the stability of test results in statistics
  • Support PACK_KEYS syntax for the CREATE TABLE statement
  • Add row_id column for the null pushdown schema to optimize performance

Bug Fixes

  • Fix the resource leak issue in statistics
  • Fix the goroutine leak issue
  • Fix an issue about IndexJoin

[1.1.0-alpha] - 2018-01-19

New Features

  • Support the PROXY protocol

Improvements

  • Support more syntax
  • Reduce memory usage of statistics info using more compact structure
  • Speed up loading statistics info when starting tidb-server
  • Provide more accurate query cost evaluation
  • Use Count-Min Sketch to estimate the cost of queries using unique index more accurately
  • Support more complex conditions to make full use of index
  • Refactor all executor operators using Chunk architecture, improve the execution performance of analytical statements and reduce memory usage
  • Optimize performance of the INSERT IGNORE statement
  • Push down more types and functions to TiKV
  • 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