Weekly update in TiDB

Last week, we landed 51 PRs in the TiDB repository.

Added

• Add the SHOW CREATE USER syntax
• Support the named window feature
• Add support for JSON_MERGE_PRESERVE
• Propose the design for the plugin framework
• Add support for the distributed GC

Improved

• Add the row format for trace
• Restrict tidb_ddl_reorg_worker_cnt and tidb_ddl_reorg_batch_size to be global
• Build the hash table in parallel for radix hash join
• Improve Unix socket handling
• Try closing connections gracefully first in the SIGTERM case
• Improve the compatibility with MySQL when inserting a negative value into an unsigned column

Fixed

• Fix the mistaken privilege check failure for Update
• Fix bound overflow of the histogram
• Get the global value when the system variable only has a global scope
• Skip the SQL execution if the transaction is aborted
• Return an error if autoid overflows shard bits
• Fix the wrong result when int joins decimal
• Report an error for CAST(AS TIME) if the precision is too big
• Fix an error of canceling the Rename Index DDL
• Fix an incorrect behavior of the STR_TO_DATE() function

Weekly update in TiSpark

Last week, we landed 5 PRs in the TiSpark repository.

Fixed

• Fix the possible NullPointerException issue when show_row_id is set to true
• Fix the Set type when inserting multiple Set values

Weekly update in TiKV and PD

Last week, we landed 32 PRs in the TiKV and PD repositories.

Added

• Add a new metric for delayed Raft messages
• Introduce the Steady timer
• Implement Locate2Args, Locate3Args, LocateBinary2Args, and LocateBinary3Args in Coprocessor
• Add the scheduling configuration metrics
• Implement AddDurationAndString in Coprocessor
• Implement the FIELD() function in Coprocessor
• Implement run_afl and add seeds for the fuzzer

Improved

• Provide efficient codecs
• Use the batch_raft RPC and batch channel to reduce gRPC CPU usage
• Make apply scale
• Switch the gRPC event engine from epollsig to epollex
• Enable the GC worker to do GC by itself

Fixed

• Fix the useless log level
• Fix the panic when getting overlapping Regions with version 0
• Fix the gRPC log redirection

New contributors (Thanks!)

tidb:

• alex-lx
• invzhi
• lnhote
• nange
• shinytang6
• snithish

tikv:

• DCjanus
• aylei
• gaodayue
• yeshengm

parser:

• firekillice
• zhaoxiaojie0415

docs:

• lastzero