com.pervasive.datarush.operators.join

Enum JoinMode

java.lang.Object

java.lang.Enum<JoinMode>

com.pervasive.datarush.operators.join.JoinMode

All Implemented Interfaces:

Serializable, Comparable<JoinMode>

public enum JoinMode
extends Enum<JoinMode>

Specifies how the Join operator should handle rows with unmatched keys. These are rows from one of the inputs of the join that do not join with any row from the other input. Such rows may be dropped from the join, or retained by padding with nulls to populate fields where data is not available.

Enum Constant Summary

Enum Constants

Enum Constant and Description
FULL_OUTER Full outer join: Retain rows with unmatched keys.
INNER Inner join: Discard input rows with unmatched keys.
LEFT_OUTER Left outer join: Retain rows from the left input with unmatched keys, but discard such rows from the right input.
RIGHT_OUTER Right outer join: Retain rows from the right input with unmatched keys, but discard such rows from the left input.

Method Summary

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

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

INNER

public static final JoinMode INNER

Inner join: Discard input rows with unmatched keys.

FULL_OUTER

public static final JoinMode FULL_OUTER

Full outer join: Retain rows with unmatched keys.

LEFT_OUTER

public static final JoinMode LEFT_OUTER

Left outer join: Retain rows from the left input with unmatched keys, but discard such rows from the right input.

RIGHT_OUTER

public static final JoinMode RIGHT_OUTER

Right outer join: Retain rows from the right input with unmatched keys, but discard such rows from the left input.

Method Detail

values

public static JoinMode[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (JoinMode c : JoinMode.values())
    System.out.println(c);

Returns:

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

valueOf

public static JoinMode valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (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 type has no constant with the specified name

NullPointerException - if the argument is null