Package io.deephaven.engine.table.impl

Class DeferredViewTable.TableReference

java.lang.Object

io.deephaven.util.referencecounting.ReferenceCounted

io.deephaven.engine.liveness.ReferenceCountedLivenessReferent

io.deephaven.engine.liveness.ReferenceCountedLivenessNode

io.deephaven.engine.liveness.LivenessArtifact

io.deephaven.engine.table.impl.DeferredViewTable.TableReference

All Implemented Interfaces:

LogOutputAppendable, LivenessManager, LivenessNode, LivenessReferent, Serializable

Enclosing class:

DeferredViewTable

public static class DeferredViewTable.TableReference
extends LivenessArtifact

The table reference hides the table underlying table from us.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DeferredViewTable.TableReference.TableAndRemainingFilters

Field Summary

Fields

Modifier and Type	Field	Description
protected final Table	table

Method Summary

Modifier and Type	Method	Description
Table	get()	Returns the table in a form that the user can run queries on it.
TableDefinition	getDefinition()	Get the definition, without instantiating the table.
protected DeferredViewTable.TableReference.TableAndRemainingFilters	getWithWhere(WhereFilter... whereFilters)	Get the table in a form that the user can run queries on it.
final boolean	isRefreshing()	Is the node updating?
Table	selectDistinctInternal(Collection<? extends Selectable> columns)	If possible to execute a selectDistinct without instantiating the full table, then do so.

Methods inherited from class io.deephaven.engine.liveness.LivenessArtifact

manageWithCurrentScope

Methods inherited from class io.deephaven.engine.liveness.ReferenceCountedLivenessNode

getWeakReference, initializeTransientFieldsForLiveness, onReferenceCountAtZero, tryManage, tryUnmanage, tryUnmanage

Methods inherited from class io.deephaven.engine.liveness.ReferenceCountedLivenessReferent

destroy, dropReference, tryRetainReference

Methods inherited from class io.deephaven.util.referencecounting.ReferenceCounted

append, decrementReferenceCount, forceReferenceCountToZero, getReferenceCountDebug, incrementReferenceCount, resetReferenceCount, toString, tryDecrementReferenceCount, tryIncrementReferenceCount

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.deephaven.engine.liveness.LivenessManager

manage

Methods inherited from interface io.deephaven.engine.liveness.LivenessNode

unmanage, unmanage

Methods inherited from interface io.deephaven.engine.liveness.LivenessReferent

dropReference, getReferentDescription, retainReference, tryRetainReference

Field Details

table

protected final Table table

Method Details

isRefreshing

public final boolean isRefreshing()

Is the node updating?

Returns:

true if the node is updating; false otherwise.

get

public Table get()

Returns the table in a form that the user can run queries on it. This may be as simple as returning a reference, but for uncoalesced tables, this means we need to do the work to instantiate it.

Returns:

the table

getDefinition

public TableDefinition getDefinition()

Get the definition, without instantiating the table.

Returns:

the definition of the table

getWithWhere

protected DeferredViewTable.TableReference.TableAndRemainingFilters getWithWhere(WhereFilter... whereFilters)

Get the table in a form that the user can run queries on it. All the filters that can be run efficiently should be run before coalescing the full table should be run. Other filters are returned in the remainingFilters field.

Parameters:

whereFilters - filters to maybe apply before returning the table

Returns:

the instantiated table and a set of filters that were not applied.

selectDistinctInternal

public Table selectDistinctInternal(Collection<? extends Selectable> columns)

If possible to execute a selectDistinct without instantiating the full table, then do so. Otherwise, return null.

Parameters:

columns - the columns to selectDistinct

Returns:

null if the operation can not be performed on an uncoalesced table, otherwise a new table with the distinct values from strColumns.