6 files declare their use of SchemaObjectExistsException

DbImportCommand.php in core/lib/Drupal/Core/Command/DbImportCommand.php
Schema.php in core/modules/sqlite/src/Driver/Database/sqlite/Schema.php
Schema.php in core/modules/mysql/src/Driver/Database/mysql/Schema.php
Schema.php in core/modules/pgsql/src/Driver/Database/pgsql/Schema.php
SchemaTest.php in core/modules/mysql/tests/src/Kernel/mysql/SchemaTest.php
UserCreationTrait.php in core/modules/user/tests/src/Traits/UserCreationTrait.php

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