Package org.h2.command.query

Class SelectGroups.Plain

java.lang.Object

org.h2.command.query.SelectGroups

org.h2.command.query.SelectGroups.Plain

Enclosing class:

SelectGroups

private static final class SelectGroups.Plain
extends SelectGroups

Field Summary

Fields

Modifier and Type	Field	Description
private java.util.Iterator<java.lang.Object[]>	cursor	Cursor for next() method.
private java.util.ArrayList<java.lang.Object[]>	rows

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

currentGroupByExprData, currentGroupRowId, expressions, session

Constructor Summary

Constructors

Constructor	Description
Plain(SessionLocal session, java.util.ArrayList<Expression> expressions)

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	reset()	Resets this group data for reuse.
(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, remove, resetLazy, setCurrentGroupExprData, setWindowExprData

Methods inherited from class java.lang.Object

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

Field Detail

rows

private java.util.ArrayList<java.lang.Object[]> rows

cursor

private java.util.Iterator<java.lang.Object[]> cursor

Cursor for next() method.

Constructor Detail

Plain

Plain(SessionLocal session,
      java.util.ArrayList<Expression> expressions)

Method Detail

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