Getting and building Databend from Source
First Pull Request
You first good Databend pull request
How to Write Scalar Function
What's Scalar Function
How to Write Aggregate Function
An aggregate function, or aggregation function, is a function that combines values from multiple rows to form a single summary value. Common aggregate functions include sum, count, avg, and others.
How to Profile Databend
Profile Guided Optimization (PGO)
Building an optimized Databend with Profile Guided Optimization.