com.facebook.hive.orc

Class ReaderImpl

java.lang.Object

com.facebook.hive.orc.ReaderImpl

All Implemented Interfaces:

Reader

public final class ReaderImpl
extends Object
implements Reader

Constructor Summary

Constructors

Constructor and Description
ReaderImpl(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path path, org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
CompressionKind	getCompression() Get the compression kind.
int	getCompressionSize() Get the buffer size for the compression.
long	getContentLength() Get the length of the file.
Iterable<String>	getMetadataKeys() Get the user metadata keys.
ByteBuffer	getMetadataValue(String key) Get a user metadata value.
long	getNumberOfRows() Get the number of rows in the file.
org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector	getObjectInspector() Get the object inspector for looking at the objects.
long	getRawDataSize() Get the raw size of the data in the file
int	getRowIndexStride() Get the number of rows per a entry in the row index.
ColumnStatistics[]	getStatistics() Get the statistics about the columns in the file.
Iterable<StripeInformation>	getStripes() Get the list of stripes.
List<OrcProto.Type>	getTypes() Get the list of types contained in the file.
RecordReader	rows(boolean[] include) Create a RecordReader that will scan the entire file.
RecordReader	rows(long offset, long length, boolean[] include) Create a RecordReader that will start reading at the first stripe after offset up to the stripe that starts at offset + length.
StripeReader	stripes(long offset, long length) Create a StripeReader that will start reading at the first stripe after offset up to the stripe that starts at offset + length.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReaderImpl

public ReaderImpl(org.apache.hadoop.fs.FileSystem fs,
                  org.apache.hadoop.fs.Path path,
                  org.apache.hadoop.conf.Configuration conf)
           throws IOException

Throws:

IOException

Method Detail

getNumberOfRows

public long getNumberOfRows()

Description copied from interface: Reader

Get the number of rows in the file.

Specified by:

getNumberOfRows in interface Reader

Returns:

the number of rows

getRawDataSize

public long getRawDataSize()

Description copied from interface: Reader

Get the raw size of the data in the file

Specified by:

getRawDataSize in interface Reader

Returns:

the raw size

getMetadataKeys

public Iterable<String> getMetadataKeys()

Description copied from interface: Reader

Get the user metadata keys.

Specified by:

getMetadataKeys in interface Reader

Returns:

the set of metadata keys

getMetadataValue

public ByteBuffer getMetadataValue(String key)

Description copied from interface: Reader

Get a user metadata value.

Specified by:

getMetadataValue in interface Reader

Parameters:

key - a key given by the user

Returns:

the bytes associated with the given key

getCompression

public CompressionKind getCompression()

Description copied from interface: Reader

Get the compression kind.

Specified by:

getCompression in interface Reader

Returns:

the kind of compression in the file

getCompressionSize

public int getCompressionSize()

Description copied from interface: Reader

Get the buffer size for the compression.

Specified by:

getCompressionSize in interface Reader

Returns:

number of bytes to buffer for the compression codec.

getStripes

public Iterable<StripeInformation> getStripes()

Description copied from interface: Reader

Get the list of stripes.

Specified by:

getStripes in interface Reader

Returns:

the information about the stripes in order

getObjectInspector

public org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector getObjectInspector()

Description copied from interface: Reader

Get the object inspector for looking at the objects.

Specified by:

getObjectInspector in interface Reader

Returns:

an object inspector for each row returned

getContentLength

public long getContentLength()

Description copied from interface: Reader

Get the length of the file.

Specified by:

getContentLength in interface Reader

Returns:

the number of bytes in the file

getTypes

public List<OrcProto.Type> getTypes()

Description copied from interface: Reader

Get the list of types contained in the file. The root type is the first type in the list.

Specified by:

getTypes in interface Reader

Returns:

the list of flattened types

getRowIndexStride

public int getRowIndexStride()

Description copied from interface: Reader

Get the number of rows per a entry in the row index.

Specified by:

getRowIndexStride in interface Reader

Returns:

the number of rows per an entry in the row index or 0 if there is no row index.

getStatistics

public ColumnStatistics[] getStatistics()

Description copied from interface: Reader

Get the statistics about the columns in the file.

Specified by:

getStatistics in interface Reader

Returns:

the information about the column

rows

public RecordReader rows(boolean[] include)
                  throws IOException

Description copied from interface: Reader

Create a RecordReader that will scan the entire file.

Specified by:

rows in interface Reader

Parameters:

include - true for each column that should be included

Returns:

A new RecordReader

Throws:

IOException

rows

public RecordReader rows(long offset,
                         long length,
                         boolean[] include)
                  throws IOException

Description copied from interface: Reader

Create a RecordReader that will start reading at the first stripe after offset up to the stripe that starts at offset + length. This is intended to work with MapReduce's FileInputFormat where divisions are picked blindly, but they must cover all of the rows.

Specified by:

rows in interface Reader

Parameters:

offset - a byte offset in the file

length - a number of bytes in the file

include - true for each column that should be included

Returns:

a new RecordReader that will read the specified rows.

Throws:

IOException

stripes

public StripeReader stripes(long offset,
                            long length)
                     throws IOException

Description copied from interface: Reader

Create a StripeReader that will start reading at the first stripe after offset up to the stripe that starts at offset + length.

Specified by:

stripes in interface Reader

Parameters:

offset - a byte offset in the file

length - a number of bytes in the file

Returns:

a new StripeReader that will read the specified stripes.

Throws:

IOException