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The commit phase of enableSharding is currently implemented by ShardingCatalogManager::createDatabase() and includes logic to:
- perform initial checks on the received parameters
- validate that the incoming request does not conflict with already persisted namespaces
- perform the needed insertions into the sharding catalog
Some very similar logic is also implemented within ShardingCatalogManager::addShard() to import the set of databases stored in the shard being added.
A common function could be extracted to remove duplicated code.
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