7 files declare their use of Merge
- Connection.php in core/lib/ Drupal/ Core/ Database/ Connection.php 
- DatabaseStorage.php in core/lib/ Drupal/ Core/ KeyValueStore/ DatabaseStorage.php 
- Merge.php in core/modules/ sqlite/ src/ Driver/ Database/ sqlite/ Merge.php 
- Merge.php in core/modules/ mysql/ src/ Driver/ Database/ mysql/ Merge.php 
- Merge.php in core/modules/ pgsql/ src/ Driver/ Database/ pgsql/ Merge.php 
- Merge.php in core/tests/ fixtures/ database_drivers/ module/ corefake/ src/ Driver/ Database/ corefakeWithAllCustomClasses/ Merge.php 
- MergeTest.php in core/tests/ Drupal/ KernelTests/ Core/ Database/ MergeTest.php 
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