com.facebook.presto.hive

Interface EncryptionInformationSource

All Known Implementing Classes:

AbstractDwrfEncryptionInformationSource

public interface EncryptionInformationSource

Responsible for taking care of returning an object which implements EncryptionMetadata if the passed in Table satisfies the criteria for the implementation.

Method Summary

Modifier and Type	Method and Description
Optional<EncryptionInformation>	getReadEncryptionInformation(ConnectorSession session, Table table, Optional<Set<HiveColumnHandle>> requestedColumns) Return encryption information for an unpartitioned table
Optional<Map<String,EncryptionInformation>>	getReadEncryptionInformation(ConnectorSession session, Table table, Optional<Set<HiveColumnHandle>> requestedColumns, Map<String,Partition> partitions) Return encryption for a partitioned table
Optional<EncryptionInformation>	getWriteEncryptionInformation(ConnectorSession session, TableEncryptionProperties tableEncryptionProperties, String dbName, String tableName) Return information required for writing to a table.

Method Detail

getReadEncryptionInformation

Optional<Map<String,EncryptionInformation>> getReadEncryptionInformation(ConnectorSession session,
                                                                         Table table,
                                                                         Optional<Set<HiveColumnHandle>> requestedColumns,
                                                                         Map<String,Partition> partitions)

Return encryption for a partitioned table

Parameters:

session - Session object for the associated query

table - Table information

requestedColumns - The columns that the query is requesting access to. The implementations can use this to only return information for the requested columns

partitions - Map from partition names to the column objects

Returns:

Map from the partition name to the encryption information for that respective partition. The implementation can decide to return information for selected partitions. The implementation should return Optional.empty() if it does not have any encryption information available for the given table and partitions, either due to the format or the table not having any encrypted data.

getReadEncryptionInformation

Optional<EncryptionInformation> getReadEncryptionInformation(ConnectorSession session,
                                                             Table table,
                                                             Optional<Set<HiveColumnHandle>> requestedColumns)

Return encryption information for an unpartitioned table

Parameters:

session - Session object for the associated query

table - Table information

requestedColumns - The columns that the query is requesting access to. The implementations can use this to only return information for the requested columns

Returns:

Encryption information for the given table. The implementation should return Optional.empty() if it does not have any encryption information available for the given table, either due to the format or the table not having any encrypted data.

getWriteEncryptionInformation

Optional<EncryptionInformation> getWriteEncryptionInformation(ConnectorSession session,
                                                              TableEncryptionProperties tableEncryptionProperties,
                                                              String dbName,
                                                              String tableName)

Return information required for writing to a table. This method is intended to be used for both partitioned and unpartitioned tables since Presto isn't aware of the partitions that are being written to ahead of time.

Parameters:

session - Session object for the associated query

tableEncryptionProperties - Table encryption information

dbName - database name

tableName - table name

Returns:

Encryption information for the given table. The implementation should return Optional.empty() if it does not have any encryption information available for the given table, either due to the format or the table not having any encrypted data.