presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/storage/StorageManagerConfig.java/StorageManagerConfig/setDeletionThreads
class StorageManagerConfig:    @Config("storage.max-deletion-threads")
    @ConfigDescription("Maximum number of threads to use for deletions")
    public StorageManagerConfig setDeletionThreads(int deletionThreads)
    {
        this.deletionThreads = deletionThreads;
        return this;
    }