org.apache.hadoop.hive.metastore

Interface FileFormatProxy

public interface FileFormatProxy

Same as PartitionExpressionProxy, but for file format specific methods for metadata cache.

Method Summary

Modifier and Type	Method and Description
Metastore.SplitInfos	applySargToMetadata(SearchArgument sarg, ByteBuffer fileMetadata, org.apache.hadoop.conf.Configuration conf) Applies SARG to file metadata, and produces some result for this file.
ByteBuffer[]	getAddedColumnsToCache()
ByteBuffer[][]	getAddedValuesToCache(List<ByteBuffer> metadata)
ByteBuffer	getMetadataToCache(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path path, ByteBuffer[] addedVals)

Method Detail

applySargToMetadata

Metastore.SplitInfos applySargToMetadata(SearchArgument sarg,
                                         ByteBuffer fileMetadata,
                                         org.apache.hadoop.conf.Configuration conf)
                                  throws IOException

Applies SARG to file metadata, and produces some result for this file.

Parameters:

sarg - SARG

fileMetadata - File metadata from metastore cache.

Returns:

The result to return to client for this file, or null if file is eliminated.

Throws:

IOException

getMetadataToCache

ByteBuffer getMetadataToCache(org.apache.hadoop.fs.FileSystem fs,
                              org.apache.hadoop.fs.Path path,
                              ByteBuffer[] addedVals)
                       throws IOException

Parameters:

fs - The filesystem of the file.

path - The file path.

addedVals - Output parameter; additional column values for columns returned by getAddedColumnsToCache to cache in MS.

Returns:

The ORC file metadata for a given file.

Throws:

IOException

getAddedColumnsToCache

ByteBuffer[] getAddedColumnsToCache()

Returns:

Additional column names to cache in MS for this format.

getAddedValuesToCache

ByteBuffer[][] getAddedValuesToCache(List<ByteBuffer> metadata)

Parameters:

metadata - File metadatas.

Returns:

Additional values for columns returned by getAddedColumnsToCache to cache in MS for respective metadatas.