Generated hash columns in MySQL

The text discusses generating hash columns in MySQL for faster strict equality lookups. It explains how generated columns work and provides examples of using them to create compact indexes that are faster than wide indexes. The article also covers hashing multiple columns into one, using a composite hash, and storing the values as binary strings to improve efficiency. Additionally, it introduces functional indexes in MySQL 8.0.13, which allow for creating an index on the result of a function without using a generated column. The goal is to provide a more efficient way to perform strict equality lookups and enforce uniqueness across multiple columns.