org.apache.hadoop.hive.ql.io

Class RCFile.KeyBuffer

java.lang.Object

org.apache.hadoop.hive.ql.io.RCFile.KeyBuffer

All Implemented Interfaces:

Comparable, org.apache.hadoop.io.Writable, org.apache.hadoop.io.WritableComparable

Enclosing class:

RCFile

public static class RCFile.KeyBuffer
extends Object
implements org.apache.hadoop.io.WritableComparable

KeyBuffer is the key of each record in RCFile. Its on-disk layout is as below:

• record length in bytes,it is the sum of bytes used to store the key part and the value part.
• Key length in bytes, it is how many bytes used by the key part.
• number_of_rows_in_this_record(vint),
• column_1_ondisk_length(vint),
• column_1_row_1_value_plain_length,
• column_1_row_2_value_plain_length,
• ....
• column_2_ondisk_length(vint),
• column_2_row_1_value_plain_length,
• column_2_row_2_value_plain_length,
• .... .
• {the end of the key part}

Constructor Summary

Constructors

Constructor and Description
KeyBuffer() Deprecated.

Method Summary

Modifier and Type	Method and Description
int	compareTo(Object arg0)
int	getColumnNumber()
int[]	getEachColumnUncompressedValueLen()
int[]	getEachColumnValueLen()
int	getNumberRows()
int	getSize() get number of bytes to store the keyBuffer.
void	nullColumn(int columnIndex)
void	readFields(DataInput in)
void	write(DataOutput out)

Methods inherited from class java.lang.Object

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

Constructor Detail

KeyBuffer

@Deprecated
public KeyBuffer()

Deprecated.

Method Detail

getColumnNumber

public int getColumnNumber()

nullColumn

public void nullColumn(int columnIndex)

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Throws:

IOException

getSize

public int getSize()
            throws IOException

get number of bytes to store the keyBuffer.

Returns:

number of bytes used to store this KeyBuffer on disk

Throws:

IOException

compareTo

public int compareTo(Object arg0)

Specified by:

compareTo in interface Comparable

getEachColumnUncompressedValueLen

public int[] getEachColumnUncompressedValueLen()

getEachColumnValueLen

public int[] getEachColumnValueLen()

getNumberRows

public int getNumberRows()

Returns:

the numberRows