In MySQL 8.0.16 the optimizer has improved again!
Comparisons of columns of numeric types with constant values are checked and folded or removed for invalid or out-of-rage values.
The goal is to speed up query execution.
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.
MySQL Tech Day @Paris
We’re happy to announce you that MySQL Tech Day will take place in Paris on Oct 10, 2013 in Oracle main office. It’ll be a full day event giving you an occasion to listen directly from Oracle developers about most of the improvements made recently within MySQL 5.6 and 5.7 development.
