Package io.trino.operator

Class TopNPeerGroupLookup

java.lang.Object

io.trino.operator.TopNPeerGroupLookup

public class TopNPeerGroupLookup
extends Object

Optimized hash table for streaming Top N peer group lookup operations.

Constructor Summary

Constructors

Constructor	Description
TopNPeerGroupLookup(long expected, float fillFactor, RowIdHashStrategy strategy, long unmappedGroupId, long defaultReturnValue)	Standard hash table parameters are expected.
TopNPeerGroupLookup(long expected, RowIdHashStrategy strategy, long unmappedGroupId, long defaultReturnValue)

Method Summary

Modifier and Type	Method	Description
long	get(long groupId, long rowId)
long	get(long groupId, RowReference rowReference)
boolean	isEmpty()
long	put(long groupId, long rowId, long value)
long	remove(long groupId, long rowId)
long	size()
long	sizeOf()	Returns the size of this hash map in bytes.

Methods inherited from class java.lang.Object

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

Constructor Details

TopNPeerGroupLookup

public TopNPeerGroupLookup(long expected,
 float fillFactor,
 RowIdHashStrategy strategy,
 long unmappedGroupId,
 long defaultReturnValue)

Standard hash table parameters are expected. unmappedGroupId specifies the internal marker value for unmapped group IDs.

TopNPeerGroupLookup

public TopNPeerGroupLookup(long expected,
 RowIdHashStrategy strategy,
 long unmappedGroupId,
 long defaultReturnValue)

Method Details

sizeOf

public long sizeOf()

Returns the size of this hash map in bytes.

size

public long size()

isEmpty

public boolean isEmpty()

get

public long get(long groupId,
 long rowId)

get

public long get(long groupId,
 RowReference rowReference)

put

public long put(long groupId,
 long rowId,
 long value)

remove

public long remove(long groupId,
 long rowId)