In order to accelerate expression evaluation, we recently refactored its framework. This tutorial will show you how to use the new computational framework to rewrite or add a built-in function in TiDB.
This is the speech Siddon Tang gave at the 1st Rust Meetup in Beijing on April 16, 2017.
TiDB code is updated and the procedure of adding built-in functions is greatly simplified. This document describes how to add built-in functions to TiDB.
Subquery optimization, especially rewriting the correlated subquery, is a very difficult part in SQL query optimization. To be compatible with MySQL, TiDB enables users to write subqueries anywhere they want. For those subqueries that are not correlated, which are also called uncorrelated subqueries, TiDB evaluates in advance; for those correlated subqueries, TiDB removes the correlations as much as possible. For example, TiDB can rewrite a correlated subquery to `SemiJoin`. This article is focused on introducing the correlated subquery optimization methods in TiDB.
This document gives an overview of MVCC implementation in TiKV.
This document introduces the History Read feature in TiDB.