water.parser

Class Categorical

java.lang.Object

water.Iced

water.parser.Categorical

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, java.lang.Cloneable, Freezable

public final class Categorical
extends Iced

Class for tracking categorical (factor) columns. Basically a wrapper around non blocking hash map. In the first pass, we just collect set of unique strings per column (if there are less than MAX_CATEGORICAL_COUNT unique elements). After pass1, the keys are sorted and indexed alphabetically. In the second pass, map is used only for lookup and never updated. Categorical objects are shared among threads on the local nodes!

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_CATEGORICAL_COUNT

Method Summary

Modifier and Type	Method and Description
java.lang.String	toString()

Methods inherited from class water.Iced

asBytes, clone, copyOver, frozenType, read, readExternal, readJSON, reloadFromBytes, toJsonBytes, toJsonString, write, writeExternal, writeJSON

Methods inherited from class java.lang.Object

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

Field Detail

MAX_CATEGORICAL_COUNT

public static final int MAX_CATEGORICAL_COUNT

See Also:

Constant Field Values

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object