MySQL Enterprise Data Masking and De-Identification hides sensitive information by replacing real values with substitutes in order to protect sensitive data while they are still look real and consistent.
Since MySQL 5.7 one can put indexes on expressions, aka functional indexes, using generated columns. Basically you first need to use the generated column to define the functional expression, then indexed this column.
Quite useful when dealing with JSON functions, you can find an example here and the documentation there.
Starting with MySQL 8.0.13 we have now an easiest way to create functional indexes (or functional key parts as mentioned in the documentation) \o/
Let’s see how with a quick practical example.