org.h2.table

Class JoinBatch

java.lang.Object

org.h2.table.JoinBatch

public final class JoinBatch
extends java.lang.Object

Support for asynchronous batched index lookups on joins.

See Also:

BaseIndex.createLookupBatch(org.h2.table.TableFilter[], int), IndexLookupBatch

Constructor Summary

Constructors

Constructor and Description
JoinBatch(int filtersCount, TableFilter additionalFilter)

Method Summary

Modifier and Type	Method and Description
static IndexLookupBatch	createFakeIndexLookupBatch(TableFilter filter) Create fake index lookup batch for non-batched table filter.
static IndexLookupBatch	createViewIndexLookupBatch(ViewIndex viewIndex) Create index lookup batch for a view index.
IndexLookupBatch	getLookupBatch(int joinFilterId) Get the lookup batch for the given table filter.
Value	getValue(int filterId, Column column) Get the value for the given column.
boolean	next() Get next row from the join batch.
void	register(TableFilter filter, IndexLookupBatch lookupBatch) Register the table filter and lookup batch.
void	reset(boolean beforeQuery) Reset state of this batch.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinBatch

public JoinBatch(int filtersCount,
                 TableFilter additionalFilter)

Parameters:

filtersCount - number of filters participating in this batched join

additionalFilter - table filter after this batched join.

Method Detail

getLookupBatch

public IndexLookupBatch getLookupBatch(int joinFilterId)

Get the lookup batch for the given table filter.

Parameters:

joinFilterId - joined table filter id

Returns:

lookup batch

reset

public void reset(boolean beforeQuery)

Reset state of this batch.

Parameters:

beforeQuery - true if reset was called before the query run, false if after

register

public void register(TableFilter filter,
                     IndexLookupBatch lookupBatch)

Register the table filter and lookup batch.

Parameters:

filter - table filter

lookupBatch - lookup batch

getValue

public Value getValue(int filterId,
                      Column column)

Get the value for the given column.

Parameters:

filterId - table filter id

column - the column

Returns:

column value for current row

next

public boolean next()

Get next row from the join batch.

Returns:

true if there is a next row

createViewIndexLookupBatch

public static IndexLookupBatch createViewIndexLookupBatch(ViewIndex viewIndex)

Create index lookup batch for a view index.

Parameters:

viewIndex - view index

Returns:

index lookup batch or null if batching is not supported for this query

createFakeIndexLookupBatch

public static IndexLookupBatch createFakeIndexLookupBatch(TableFilter filter)

Create fake index lookup batch for non-batched table filter.

Parameters:

filter - the table filter

Returns:

fake index lookup batch

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object