innumerate

Set per-column statistics targets for PostgreSQL in Rails

In your ActiveRecord migrations, you can use:

set_statistics_target :users, :email, 1000

... to set the statistics target of users.email to 1000. To make the migration reversible, use the old_target option:

set_statistics_target :users, :email, 1000, old_target: -1

Note that -1 means "use the server's default statistics target."