2017-08-21-tidb-weekly.md

title	date	summary	tags
Weekly update (August 14 ~ August 20, 2017)	2017-08-21	Last week, we landed 57 PRs in the TiDB repositories and 33 PRs in the TiKV repositories.	TiDB TiKV

Weekly update in TiDB

Last week, we landed 57 PRs in the TiDB repositories.

Added

• Add the version information in diagnostic messages.
• Add the Close() method to RawKVClient.
• Add JSON in fieldTypeMergeRules.
• Add support to MySQL connector 6.06.
• Add Git branch name in tidb_version() and the starting log.
• Add the auto analyze feature for tables.

Fixed

• DDL uses the correct method to check whether the context is done.
• Close the PD client in TiKV store and raw KV to prevent connection leak.
• Restore WrapCastAsReal and WrapCastAsDecimal if the argument is ClassInt.
• Notify the fetching goroutines to exit when IndexLookupExecutor closes.
• Fix the error in the return type for the ceil/floor function.
• Start GCWorker after the bootstrapping is finished.
• Add a limit to the number of multi-column index key parts.
• Disable the mysql.ClientMultiStatements capability
• Allow username to contain '@'.

Improved

• Handle canceled error by Grpc remote.
• Remove all the stuff about the backgroud DDL worker.
• Use more effective terror comparison method.
• Union scan reuses PK when it is a handle.
• Use FieldType.Decimal to control the decimal length of double values to be shown in client.
• Support time constant pushdown in mocktikv.
• Return the unsupported error in the type infer stage.
• Refactor the following expression/builtin-function evaluation framework:
  • CRC32
  • TIME
  • HOUR, MINUTE, SECOND, MICROSECOND
  • RAND, POW, SIGN, SQRT
  • DIV
  • TRUNCATE
  • ANY_VALUE
  • DNF
  • NULLIF
  • TIMESTAMPADD
  • TO_SECONDS
  • TO_DAYS
  • CASE
  • RADIANS
  • OCT
  • IS_IPV4, IS_IPV6, IS_IPV4_COMPAT, IS_IPV4_MAPP
  • INET_ATON, INET_NTOA, INET6_ATON, INET6_NTOA
  • TIME_FORMAT

Weekly update in TiKV

Last week, We landed 33 PRs in the TiKV repositories.

Added

• Add hex/escaped converting for tikv-ctl.
• Implement the basic structure of builtin_cast and some functions for DAG.
• Add compare to new expression calculate framework.
• Support leader resignation for PD.
• Add Git branch information to the starting log.
• Support the mysql-time constant.
• Add Constant and Column for coprocessor.
• Add RocksDB event metrics.

Fixed

• Declare config for each CF explicitly.
• Use millisecond resolution for the coarse Instant.
• Only collect properties for DBEntryType::Put.
• Allow coarse error.

Improved

• Check approximate size before split check.
• Get snapshot in batches for coprocessor.
• Get snapshot in batches for endpoint.
• Use separated thread to flush metrics.
• Use histogram coarse timer.
• Upgrade Rocksdb to 5.6.2.
• Deprecate v1 snapshot.
• Reorganize the server start up process for PD.
• Broadcast when there is pending conf change.