net.sf.farrago.fennel.rel
Class FennelWindowRel.Window

java.lang.Object
  net.sf.farrago.fennel.rel.FennelWindowRel.Window

Enclosing class:

FennelWindowRel

public static class FennelWindowRel.Window
extends Object

A Window is a range of input rows, defined by an upper and lower bound. It also contains a list of FennelWindowRel.Partition objects.

A window is either logical or physical. A physical window is measured in terms of row count. A logical window is measured in terms of rows within a certain distance from the current sort key.

For example:

• ROWS BETWEEN 10 PRECEDING and 5 FOLLOWING is a physical window with an upper and lower bound;
• RANGE BETWEEN INTERVAL '1' HOUR PRECEDING AND UNBOUNDED FOLLOWING is a logical window with only a lower bound;
• RANGE INTERVAL '10' MINUTES PRECEDING (which is equivalent to RANGE BETWEEN INTERVAL '10' MINUTES PRECEDING AND CURRENT ROW) is a logical window with an upper and lower bound.

Field Summary

private String	digest
(package private) SqlNode	lowerBound
Integer[]	orderKeys
private List<FennelWindowRel.Partition>	partitionList The partitions which make up this window.
(package private) boolean	physical
(package private) SqlNode	upperBound

Constructor Summary

FennelWindowRel.Window(boolean physical, SqlNode lowerBound, SqlNode upperBound, Integer[] ordinals)

Method Summary

void	computeDigest()
private void	computeDigest(StringBuilder buf)
boolean	equals(Object obj)
List<FennelWindowRel.Partition>	getPartitionList()
FennelWindowRel.Partition	lookupOrCreatePartition(Integer[] partitionKeys)
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

partitionList

private final List<FennelWindowRel.Partition> partitionList

The partitions which make up this window.

physical

final boolean physical

lowerBound

final SqlNode lowerBound

upperBound

final SqlNode upperBound

orderKeys

public final Integer[] orderKeys

digest

private String digest

Constructor Detail

FennelWindowRel.Window

FennelWindowRel.Window(boolean physical,
                       SqlNode lowerBound,
                       SqlNode upperBound,
                       Integer[] ordinals)

Method Detail

toString

public String toString()

Overrides:

toString in class Object

computeDigest

public void computeDigest()

computeDigest

private void computeDigest(StringBuilder buf)

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

lookupOrCreatePartition

public FennelWindowRel.Partition lookupOrCreatePartition(Integer[] partitionKeys)

getPartitionList

public List<FennelWindowRel.Partition> getPartitionList()