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                                Change Return Type	List<String> to Optional<List<String>> in method public getAllTables(databaseName String) : Optional<List<String>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method public getAllViews(databaseName String) : Optional<List<String>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	Table to Optional<Table> in method private loadTable(hiveTableName HiveTableName) : Optional<Table> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	Database to Optional<Database> in method public getDatabase(databaseName String) : Optional<Database> in class com.facebook.presto.hive.AbstractTestHiveClientS3.TestingHiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method public getPartitionNames(databaseName String, tableName String) : Optional<List<String>> in class com.facebook.presto.hive.metastore.InMemoryHiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method public getAllTables(databaseName String) : Optional<List<String>> in class com.facebook.presto.hive.metastore.InMemoryHiveMetastore | 
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                                Change Return Type	Partition to Optional<Partition> in method private loadPartitionByName(partitionName HivePartitionName) : Optional<Partition> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method private loadPartitionNamesByParts(partitionFilter PartitionFilter) : Optional<List<String>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	Map<String,Partition> to Optional<Map<String,Partition>> in method public getPartitionsByNames(databaseName String, tableName String, partitionNames List<String>) : Optional<Map<String,Partition>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method public getPartitionNamesByParts(databaseName String, tableName String, parts List<String>) : Optional<List<String>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	Map<String,Partition> to Optional<Map<String,Partition>> in method public getPartitionsByNames(databaseName String, tableName String, partitionNames List<String>) : Optional<Map<String,Partition>> in class com.facebook.presto.hive.metastore.InMemoryHiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method public getPartitionNamesByParts(databaseName String, tableName String, parts List<String>) : Optional<List<String>> in class com.facebook.presto.hive.metastore.HiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method public getAllViews(databaseName String) : Optional<List<String>> in class com.facebook.presto.hive.metastore.InMemoryHiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method private loadPartitionNames(hiveTableName HiveTableName) : Optional<List<String>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	Table to Optional<Table> in method public getTable(databaseName String, tableName String) : Optional<Table> in class com.facebook.presto.hive.metastore.InMemoryHiveMetastore | 
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                                Change Return Type	Table to Optional<Table> in method public getTable(databaseName String, tableName String) : Optional<Table> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	Database to Optional<Database> in method private loadDatabase(databaseName String) : Optional<Database> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method public getPartitionNamesByParts(databaseName String, tableName String, parts List<String>) : Optional<List<String>> in class com.facebook.presto.hive.metastore.InMemoryHiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method public getPartitionNames(databaseName String, tableName String) : Optional<List<String>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method private loadAllViews(databaseName String) : Optional<List<String>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	Database to Optional<Database> in method public getDatabase(databaseName String) : Optional<Database> in class com.facebook.presto.hive.metastore.InMemoryHiveMetastore | 
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                                Change Return Type	Map<String,Partition> to Optional<Map<String,Partition>> in method public getPartitionsByNames(databaseName String, tableName String, partitionNames List<String>) : Optional<Map<String,Partition>> in class com.facebook.presto.hive.metastore.HiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method public getAllViews(databaseName String) : Optional<List<String>> in class com.facebook.presto.hive.metastore.HiveMetastore | 
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                                Change Return Type	Table to Optional<Table> in method public getTable(databaseName String, tableName String) : Optional<Table> in class com.facebook.presto.hive.metastore.HiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method private loadAllTables(databaseName String) : Optional<List<String>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	Database to Optional<Database> in method public getDatabase(databaseName String) : Optional<Database> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	Database to Optional<Database> in method public getDatabase(databaseName String) : Optional<Database> in class com.facebook.presto.hive.metastore.HiveMetastore | 
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                                Change Return Type	Map<HivePartitionName,Partition> to Map<HivePartitionName,Optional<Partition>> in method private loadPartitionsByNames(partitionNames Iterable<? extends HivePartitionName>) : Map<HivePartitionName,Optional<Partition>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method public getPartitionNames(databaseName String, tableName String) : Optional<List<String>> in class com.facebook.presto.hive.metastore.HiveMetastore | 
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                                Change Return Type	List<String> to Optional<List<String>> in method public getAllTables(databaseName String) : Optional<List<String>> in class com.facebook.presto.hive.metastore.HiveMetastore | 
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                                Change Variable Type	table : Table to table : Optional<Table> in method public updateTableLocation(databaseName String, tableName String, location String) : void in class com.facebook.presto.hive.AbstractTestHiveClientS3.TestingHiveMetastore | 
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                                Change Variable Type	database : Database to database : Optional<Database> in method public getDatabase(databaseName String) : Optional<Database> in class com.facebook.presto.hive.AbstractTestHiveClientS3.TestingHiveMetastore | 
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                                Change Variable Type	table : Table to table : Optional<Table> in method public getSampleWeightColumnHandle(session ConnectorSession, tableHandle ConnectorTableHandle) : ColumnHandle in class com.facebook.presto.hive.HiveMetadata | 
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                                Change Variable Type	entry : Entry<HivePartitionName,Partition> to entry : Entry<HivePartitionName,Optional<Partition>> in method public getPartitionsByNames(databaseName String, tableName String, partitionNames List<String>) : Optional<Map<String,Partition>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Variable Type	table : Table to table : Optional<Table> in method public getViews(session ConnectorSession, prefix SchemaTablePrefix) : Map<SchemaTableName,String> in class com.facebook.presto.hive.HiveMetadata | 
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                                Change Variable Type	all : Map<HivePartitionName,Partition> to all : Map<HivePartitionName,Optional<Partition>> in method public getPartitionsByNames(databaseName String, tableName String, partitionNames List<String>) : Optional<Map<String,Partition>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Variable Type	table : Table to table : Optional<Table> in method public getColumnHandles(session ConnectorSession, tableHandle ConnectorTableHandle) : Map<String,ColumnHandle> in class com.facebook.presto.hive.HiveMetadata | 
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                                Change Variable Type	table : Table to table : Optional<Table> in method public dropTable(databaseName String, tableName String) : void in class com.facebook.presto.hive.AbstractTestHiveClientS3.TestingHiveMetastore | 
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                                Change Variable Type	table : Table to table : Optional<Table> in method private getTableMetadata(tableName SchemaTableName) : ConnectorTableMetadata in class com.facebook.presto.hive.HiveMetadata | 
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                                Change Attribute Type	databaseCache : LoadingCache<String,Database> to databaseCache : LoadingCache<String,Optional<Database>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Attribute Type	partitionFilterCache : LoadingCache<PartitionFilter,List<String>> to partitionFilterCache : LoadingCache<PartitionFilter,Optional<List<String>>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Attribute Type	partitionCache : LoadingCache<HivePartitionName,Partition> to partitionCache : LoadingCache<HivePartitionName,Optional<Partition>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Attribute Type	tableNamesCache : LoadingCache<String,List<String>> to tableNamesCache : LoadingCache<String,Optional<List<String>>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Attribute Type	tableCache : LoadingCache<HiveTableName,Table> to tableCache : LoadingCache<HiveTableName,Optional<Table>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Attribute Type	partitionNamesCache : LoadingCache<HiveTableName,List<String>> to partitionNamesCache : LoadingCache<HiveTableName,Optional<List<String>>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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                                Change Attribute Type	viewNamesCache : LoadingCache<String,List<String>> to viewNamesCache : LoadingCache<String,Optional<List<String>>> in class com.facebook.presto.hive.metastore.CachingHiveMetastore | 
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