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Roadmap：20190301
TiDB:
Optimizer
Statistics Optimization
Multi-Column Statistics
Cascades Planner
Plan Management
SQL Tuning Advisor
Robust Access Path Selection: add the heuristic rule and improve the accuracy of index selection in OLTP scenarios
Adaptive Query Optimization
Execution Engine
Parallel Operators
Memory Control
Concurrency Control
Shuffle Operators
Vectorized Expression Evaluation
UDF
SQL Features
Support Views
Support Window Functions
Support Common Table Expressions
Support Hash Partitioned Tables
Support the utf8mb4_0900_ai_ci Collation
Improve DDL
Support Table Lock
Support Change Column Type
Support Multiple DDL Operations in a Single Statement
Support Plugin System
Support White List Plugin
Support Audit Log Plugin
Support RBAC Plugin
Support Diagnostic Plugin
Support Query Tracing
Support Hybrid Column/Row-oriented Storage Engine
Support New Storage Row Format: improve performance and reduce memory usage
Support Non-integer Type of RowID
Transaction
Reduce Read-write Conflicts
Optimize Transaction Scheduling Mechanism
Refine Model and Reduce Latency
Support Minimal Transaction (like the mini-transaction of InnoDB)
TiKV:
Raft
Region Merge - Merge small Regions together to reduce overhead
Local Read Thread - Process read requests in a local read thread
Split Region in Batch - Speed up Region split for large Regions
Raft Learner - Support Raft learner to smooth the configuration change process
Raft Pre-vote - Support Raft pre-vote to avoid unnecessary leader election on network isolation
Joint Consensus - Change multi members safely.
Multi-thread Raftstore - Process Region Raft logic in multiple threads
Multi-thread apply pool - Apply Region Raft committed entries in multiple threads
Engine
Titan - Separate large key-values from LSM-Tree
Pluggable Engine Interface - Clean up the engine wrapper code and provide more extensibility
Storage
Flow Control - Do flow control in scheduler to avoid write stall in advance
Transaction
Optimize transaction conflicts
Distributed GC - Distribute MVCC garbage collection control to TiKV
Coprocessor
Streaming - Cut large data set into small chunks to optimize memory consumption
Chunk Execution - Process data in chunk to improve performance
Request Tracing - Provide per-request execution details
Tools
TiKV Importer - Speed up data importing by SST file ingestion
Client
TiKV client (Rust crate)
Batch gRPC Message - Reduce message overhead
PD:
Improve namespace
Different replication policies for different namespaces and tables
Decentralize scheduling table Regions
Scheduler supports prioritization to be more controllable
Use machine learning to optimize scheduling
Optimize Region metadata - Save Region metadata in detached storage engine
TiSpark:
Limit/Order push-down
Access through the DAG interface and deprecate the Select interface
Index Join and parallel merge join
Data Federation
Tools:
Tool for automating TiDB deployment
High-Performance data import tool (lightning)
Backup and restore tool (incremental backup supported by drainer, incremental restore supported by reparo)
New TiDB-binlog with improved architecture
Data online migration tool (premium edition of Syncer)
Diagnostic tools
参考：https://pingcap.com/docs/ROADMAP/