Roadmap 2022

This is Databend Roadmap 2022 🚀, sync from the #3706

Main tasks

Task	Status	Comments
Query Cluster Track #747	PROGRESS
RBAC Privileges #2793	PROGRESS
New Planner Framework #1217	PROGRESS	RFC
Database Sharing #3430	PROGRESS
STAGE Command #2976	PROGRESS
COPY Command #4104	PROGRESS
Index Design #3711	PROGRESS
Push-Based + Pull-Based processor	PROGRESS
Semi-structured Data Types #3916	PROGRESS
Support Fulltext Index #3915	PLANNING
Table Cluster Key #4268	PLANNING
Tansactions	PLANNING
Window Functions	PLANNING
Lambda Functions	PLANNING
Array Functions	PLANNING
Compile Aggregate Functions(JIT)	PLANNING
Common Table Expressions	PLANNING	MySQL CTE
External Cache	PLANNING
External Table	PLANNING	Snowflake ET
Update&Delete	PLANNING
Streaming Ingestion	PLANNING
Streaming Analytics	PLANNING

Task	Status	Release Target	Comments
Continuous Benchmarking #3084	PROGRESS