Package org.h2.command.query

Class SelectGroups.Grouped

java.lang.Object

org.h2.command.query.SelectGroups

org.h2.command.query.SelectGroups.Grouped

Enclosing class:

SelectGroups

private static final class SelectGroups.Grouped
extends SelectGroups

Field Summary

Fields

Modifier and Type	Field	Description
private ValueRow	currentGroupsKey	Key into groupByData that produces currentGroupByExprData.
private Iterator<Map.Entry<ValueRow,Object[]>>	cursor	Cursor for next() method.
private TreeMap<ValueRow,Object[]>	groupByData	Map of group-by key to group-by expression data e.g.
private final int[]	groupIndex

Fields inherited from class org.h2.command.query.SelectGroups

currentGroupByExprData, currentGroupRowId, expressions, session

Constructor Summary

Constructors

Constructor	Description
Grouped(SessionLocal session, ArrayList<Expression> expressions, int[] groupIndex)

Method Summary

Modifier and Type	Method	Description
void	done()	Invoked after all source rows are evaluated.
ValueRow	next()	Returns the key of the next group.
void	nextSource()	Invoked for each source row to evaluate group key and setup all necessary data for aggregates.
void	remove()	Removes the data for the current key.
void	reset()	Resets this group data for reuse.
void	resetLazy()	Resets this group data for reuse in lazy mode.
(package private) void	updateCurrentGroupExprData()	Update group-by data specified by implementation.

Methods inherited from class org.h2.command.query.SelectGroups

createRow, getCurrentGroupExprData, getCurrentGroupRowId, getInstance, getWindowExprData, isCurrentGroup, nextLazyGroup, nextLazyRow, setCurrentGroupExprData, setWindowExprData

Methods inherited from class java.lang.Object

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

Field Details

groupIndex

private final int[] groupIndex

groupByData

private TreeMap<ValueRow,Object[]> groupByData

Map of group-by key to group-by expression data e.g. AggregateData

currentGroupsKey

private ValueRow currentGroupsKey

Key into groupByData that produces currentGroupByExprData. Not used in lazy mode.

cursor

private Iterator<Map.Entry<ValueRow,Object[]>> cursor

Cursor for next() method.

Constructor Details

Grouped

Grouped(SessionLocal session,
 ArrayList<Expression> expressions,
 int[] groupIndex)

Method Details

reset

public void reset()

Description copied from class: SelectGroups

Resets this group data for reuse.

Overrides:

reset in class SelectGroups

nextSource

public void nextSource()

Description copied from class: SelectGroups

Invoked for each source row to evaluate group key and setup all necessary data for aggregates.

Specified by:

nextSource in class SelectGroups

updateCurrentGroupExprData

void updateCurrentGroupExprData()

Description copied from class: SelectGroups

Update group-by data specified by implementation.

Specified by:

updateCurrentGroupExprData in class SelectGroups

done

public void done()

Description copied from class: SelectGroups

Invoked after all source rows are evaluated.

Overrides:

done in class SelectGroups

next

public ValueRow next()

Description copied from class: SelectGroups

Returns the key of the next group.

Specified by:

next in class SelectGroups

Returns:

the key of the next group, or null

remove

public void remove()

Description copied from class: SelectGroups

Removes the data for the current key.

Overrides:

remove in class SelectGroups

See Also:

• SelectGroups.next()

resetLazy

public void resetLazy()

Description copied from class: SelectGroups

Resets this group data for reuse in lazy mode.

Overrides:

resetLazy in class SelectGroups