org.apache.drill.metastore.metadata

Interface TableMetadataProvider

All Known Subinterfaces:

ParquetMetadataProvider, ParquetTableMetadataProvider

All Known Implementing Classes:

BaseParquetMetadataProvider, HiveParquetTableMetadataProvider, MetastoreFileTableMetadataProvider, MetastoreParquetTableMetadataProvider, ParquetTableMetadataProviderImpl, SimpleFileTableMetadataProvider

public interface TableMetadataProvider

Base interface for providing table, partition, file etc. metadata for specific table. getPartitionsMetadata(), getFilesMetadata() and other methods which return collections return empty collection instead of null for the case when required metadata level is not available, or cannot re obtained using current TableMetadataProvider instance.

Method Summary

Modifier and Type	Method and Description
boolean	checkMetadataVersion() Whether metadata actuality should be checked.
FileMetadata	getFileMetadata(org.apache.hadoop.fs.Path location) Returns FileMetadata instance which corresponds to metadata of file for specified location.
List<FileMetadata>	getFilesForPartition(PartitionMetadata partition) Returns list of FileMetadata instances which belongs to specified partitions.
Map<org.apache.hadoop.fs.Path,FileMetadata>	getFilesMetadataMap() Returns map of FileMetadata instances which provides metadata for specific file and its columns.
NonInterestingColumnsMetadata	getNonInterestingColumnsMetadata() Returns NonInterestingColumnsMetadata instance which provides metadata for non-interesting columns.
List<SchemaPath>	getPartitionColumns() Returns list of partition columns for table from this TableMetadataProvider.
List<PartitionMetadata>	getPartitionMetadata(SchemaPath columnName) Returns list of PartitionMetadata instances which corresponds to partitions for specified column and provides metadata for specific partitions and its columns.
List<PartitionMetadata>	getPartitionsMetadata() Returns list of PartitionMetadata instances which provides metadata for specific partitions and its columns.
Map<org.apache.hadoop.fs.Path,SegmentMetadata>	getSegmentsMetadataMap() Returns map of SegmentMetadata instances which provides metadata for segment and its columns.
TableMetadata	getTableMetadata() Returns TableMetadata instance which provides metadata for table and columns metadata.

Method Detail

getTableMetadata

TableMetadata getTableMetadata()

Returns TableMetadata instance which provides metadata for table and columns metadata.

Returns:

TableMetadata instance

getPartitionColumns

List<SchemaPath> getPartitionColumns()

Returns list of partition columns for table from this TableMetadataProvider.

Returns:

list of partition columns

getPartitionsMetadata

List<PartitionMetadata> getPartitionsMetadata()

Returns list of PartitionMetadata instances which provides metadata for specific partitions and its columns.

Returns:

list of PartitionMetadata instances

getPartitionMetadata

List<PartitionMetadata> getPartitionMetadata(SchemaPath columnName)

Returns list of PartitionMetadata instances which corresponds to partitions for specified column and provides metadata for specific partitions and its columns.

Returns:

list of PartitionMetadata instances which corresponds to partitions for specified column

getFilesMetadataMap

Map<org.apache.hadoop.fs.Path,FileMetadata> getFilesMetadataMap()

Returns map of FileMetadata instances which provides metadata for specific file and its columns.

Returns:

map of FileMetadata instances

getSegmentsMetadataMap

Map<org.apache.hadoop.fs.Path,SegmentMetadata> getSegmentsMetadataMap()

Returns map of SegmentMetadata instances which provides metadata for segment and its columns.

Returns:

map of SegmentMetadata instances

getFileMetadata

FileMetadata getFileMetadata(org.apache.hadoop.fs.Path location)

Returns FileMetadata instance which corresponds to metadata of file for specified location.

Parameters:

location - location of the file

Returns:

FileMetadata instance which corresponds to metadata of file for specified location

getFilesForPartition

List<FileMetadata> getFilesForPartition(PartitionMetadata partition)

Returns list of FileMetadata instances which belongs to specified partitions.

Parameters:

partition - partition which

Returns:

list of FileMetadata instances which belongs to specified partitions

getNonInterestingColumnsMetadata

NonInterestingColumnsMetadata getNonInterestingColumnsMetadata()

Returns NonInterestingColumnsMetadata instance which provides metadata for non-interesting columns.

Returns:

NonInterestingColumnsMetadata instance

checkMetadataVersion

boolean checkMetadataVersion()

Whether metadata actuality should be checked.

Returns:

true if metadata actuality should be checked