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@shenli shenli released this Sep 14, 2018 · 946 commits to master since this release

SQL Optimizer

  • Put forward a proposal of the next generation Planner #7543
  • Improve the optimization rules of constant propagation #7276
  • Enhance the computing logic of Range to enable it to handle multiple IN or EQUAL conditions simultaneously #7577
  • Fix the issue that the estimation result of TableScan is incorrect when Range is empty #7583
  • Support the PointGet operator for the UPDATE statement #7586
  • Fix the panic issue during the process of executing the FirstRow aggregate function in some conditions #7624

SQL Execution Engine

  • Fix the potential DataRace issue when the HashJoin operator encounters an error #7554
  • Make the HashJoin operator read the inner table and build the hash table simultaneously #7544
  • Optimize the performance of Hash aggregate operators #7541
  • Optimize the performance of Join operators #7493, #7433
  • Fix the issue that the result of UPDATE JOIN is incorrect when the Join order is changed #7571
  • Improve the performance of Chunk’s iterator #7585

Statistics

  • Fix the issue that the auto Analyze work repeatedly analyzes the statistics #7550
  • Fix the statistics update error that occurs when there is no statistics change #7530
  • Use the RC isolation level and low priority when building Analyze requests #7496
  • Support enabling statistics auto-analyze on certain period of a day #7570
  • Fix the panic issue when logging the statistics information #7588
  • Support configuring the number of buckets in the histogram using the ANALYZE TABLE WITH BUCKETS statement #7619
  • Fix the panic issue when updating an empty histogram #7640
  • Update information_schema.tables.data_length using the statistics information #7657

Server

  • Add Trace related dependencies #7532
  • Enable the mutex profile feature of Golang #7512
  • The Admin statement requires the Super_priv privilege #7486
  • Forbid users to Drop crucial system tables #7471
  • Switch from juju/errors to pkg/errors #7151
  • Complete the functional prototype of SQL Tracing #7016
  • Remove the goroutine pool #7564
  • Support viewing the goroutine information using the USER1 signal #7587
  • Set the internal SQL to high priority while TiDB is started #7616
  • Use different labels to filter internal SQL and user SQL in monitoring metrics #7631
  • Store the top 30 slow queries in the last week to the TiDB server #7646
  • Put forward a proposal of setting the global system time zone for the TiDB cluster #7656
  • Enrich the error message of “GC life time is shorter than transaction duration” #7658
  • Set the global system time zone when starting the TiDB cluster #7638

Compatibility

  • Add the unsigned flag for the Year type #7542
  • Fix the issue of configuring the result length of the Year type in the Prepare/Execute mode #7525
  • Fix the issue of inserting zero timestamp in the Prepare/Execute mode #7506
  • Fix the error handling issue of the integer division #7492
  • Fix the compatibility issue when processing ComStmtSendLongData #7485
  • Fix the error handling issue during the process of converting string to integer #7483
  • Optimize the accuracy of values in the information_schema.columns_in_table table #7463
  • Fix the compatibility issue when writing or updating the string type of data using the MariaDB client #7573
  • Fix the compatibility issue of aliases of the returned value #7600
  • Fix the issue that the NUMERIC_SCALE value of the float type is incorrect in the information_schema.COLUMNS table #7602
  • Fix the issue that Parser reports an error when the single line comment is empty #7612

Expressions

  • Check the value of max_allowed_packet in the insert function #7528
  • Support the built-in function json_contains #7443
  • Support the built-in function json_contains_path #7596
  • Support the built-in function encode/decode #7622
  • Fix the issue that some time related functions are not compatible with the MySQL behaviors in some cases #7636
  • Fix the compatibility issue of parsing the time type of data in string #7654
  • Fix the issue that the time zone is not considered when computing the default value of the DateTime data #7655

DML

  • Set correct last_insert_id in the InsertOnDuplicateUpdate statement #7534
  • Reduce the cases of updating the auto_increment_id counter #7515
  • Optimize the error message of Duplicate Key #7495
  • Fix the insert...select...on duplicate key update issue #7406
  • Support the LOAD DATA IGNORE LINES statement #7576

DDL

  • Add the DDL job type and the current schema version information in the monitor #7472
  • Complete the design of the Admin Restore Table feature #7383
  • Fix the issue that the default value of the Bit type exceeds 128 #7249
  • Fix the issue that the default value of the Bit type cannot be NULL #7604
  • Reduce the interval of checking CREATE TABLE/DATABASE in the DDL queue #7608
  • Use the ddl/owner/resign HTTP interface ro release the DDL owner and start electing a new owner #7649

TiKV Go Client

  • Support the issue that the Seek operation only obtains Key #7419

Table Partition (Experimental)

  • Fix the issue that the Bigint type cannot be used as the partition key #7520
  • Support the rollback operation when an issue occurs during adding an index in the partitioned table #7437
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