Package org.apache.druid.segment.data

Enum Class CompressionFactory.LongEncodingStrategy

java.lang.Object

java.lang.Enum<CompressionFactory.LongEncodingStrategy>

org.apache.druid.segment.data.CompressionFactory.LongEncodingStrategy

All Implemented Interfaces:

Serializable, Comparable<CompressionFactory.LongEncodingStrategy>, Constable

Enclosing class:

CompressionFactory

public static enum CompressionFactory.LongEncodingStrategy
extends Enum<CompressionFactory.LongEncodingStrategy>

The compression of decompression of encodings are separated into different enums. EncodingStrategy refers to the strategy used to encode the data, and EncodingFormat refers to the format the data is encoded in. Note there is not necessarily an one-to-one mapping between to two. For instance, the AUTO LongEncodingStrategy scans the data once and decide on which LongEncodingFormat to use based on data property, so it's possible for the EncodingStrategy to write in any of the LongEncodingFormat. On the other hand, there are no LongEncodingStrategy that always write in TABLE LongEncodingFormat since it only works for data with low cardinality.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
AUTO	AUTO strategy scans all values once before encoding them.
LONGS	LONGS strategy always encode the values using LONGS format

Method Summary

Modifier and Type	Method	Description
static CompressionFactory.LongEncodingStrategy	fromString(String name)
String	toString()
static CompressionFactory.LongEncodingStrategy	valueOf(String name)	Returns the enum constant of this class with the specified name.
static CompressionFactory.LongEncodingStrategy[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

AUTO

public static final CompressionFactory.LongEncodingStrategy AUTO

AUTO strategy scans all values once before encoding them. It stores the value cardinality and maximum offset of the values to determine whether to use DELTA, TABLE, or LONGS format.

LONGS

public static final CompressionFactory.LongEncodingStrategy LONGS

LONGS strategy always encode the values using LONGS format

Method Details

values

public static CompressionFactory.LongEncodingStrategy[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static CompressionFactory.LongEncodingStrategy valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null

toString

public String toString()

Overrides:

toString in class Enum<CompressionFactory.LongEncodingStrategy>

fromString

public static CompressionFactory.LongEncodingStrategy fromString(String name)