In the \Drupal\Core\Database\Query\Merge class comment it is told that:
By default, the two table names are identical and they are passed into the the constructor. table_name_2 can be specified by the MergeQuery::conditionTable() method. It can be either a string or a subquery.
but the MergeQuery::conditionTable() method is protected.
Make the method public so we can use Merge queries to copy data from one table to another.
\Drupal\Core\Database\Query\Merge::conditionTable() becomes public.
Active
11.1 🔥
database system
Changes are made on on 11.x (our main development branch) first, and are then back ported as needed according to our policies.