Weekly update in TiDB

Last week, we landed 41 PRs in the TiDB repositories.

Added

• Support group_concat in the new aggregation evaluation framework
• Support the remained types (String/Time/Duration/JSON) for Max/Min
• Support FIRST_ROW in the new aggregation evaluation framework
• Support the admin check table statement for table partition
• Add the proposal template
• Add the new storage row format proposal
• Add the design document about the new aggregate framework
• Set the PB field type and the ExtraHandle column type

Fixed

• Fix the daylight saving time issue
• Fix the panic of creating partition tables
• Fix the bug in loading data
• Fix the OOM issue in the batch operations
• Add keepalive
• Truncate the prefix index from runes when the charset is UTF-8
• Check b.err located after buildSort and buildLimit in builUnion
• Use reference count to keep only one domain instance

Improved

• Speed up executing the replace into statement
• Handle the error of mismatch cluster id
• Refactor the index for table partition
• Check the partition count limit when creating and adding the partitioned table
• Make decoding much faster

Weekly update in TiSpark

Last week, we landed 2 PRs in the TiSpark repositories.

Improved

• Improve the error log of the PD connection issue
• Re-throw the exception when PD initialization fails

Weekly update in TiKV and PD

Last week, we landed 23 PRs in the TiKV and PD repositories.

Added

• Create MAINTAINERS.md
• Record the node version
• Support futures for the mpsc channel
• Support Region half-splitting without scan
• Add the bottommost level compaction
• Add the error code
• Support Region merging
• Support the Raft learner in the simulator
• Add the policy selection for splitting Regions

Fixed

• Fix the template permissions
• Fix the bug in from_bytes
• Handle the non-integer input for bit related functions
• Fix hot Write and Read cases

Improved

• Enable prevote by default
• Collapse continuous rollbacks
• Check sensitive environment variables
• Add a custom log formatter
• Refactor ClusterInfo
• Improve the taint cache behavior