Class MVSecondaryIndex

java.lang.Object

org.h2.engine.DbObject

org.h2.schema.SchemaObject

org.h2.index.Index

org.h2.mvstore.db.MVIndex<SearchRow, Value>

org.h2.mvstore.db.MVSecondaryIndex

All Implemented Interfaces:

HasSQL

public final class MVSecondaryIndex
extends MVIndex<SearchRow, Value>

An index stored in a MVStore.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static final class	MVSecondaryIndex.MVStoreCursor	A cursor.
private static final class	MVSecondaryIndex.Source

Field Summary

Fields

Modifier and Type	Field	Description
private final TransactionMap<SearchRow, Value>	dataMap
private final MVTable	mvTable	The multi-value table.

Fields inherited from class Index

columnIds, columns, indexColumns, indexType, table, uniqueColumnColumn

Fields inherited from class DbObject

AGGREGATE, comment, COMMENT, CONSTANT, CONSTRAINT, database, DOMAIN, FUNCTION_ALIAS, INDEX, RIGHT, ROLE, SCHEMA, SEQUENCE, SETTING, SYNONYM, TABLE_OR_VIEW, trace, TRIGGER, USER

Fields inherited from interface HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Constructor Summary

Constructors

Constructor	Description
MVSecondaryIndex(Database db, MVTable table, int id, String indexName, IndexColumn[] columns, int uniqueColumnCount, IndexType indexType)

Method Summary

Modifier and Type	Method	Description
void	add(SessionLocal session, Row row)	Add a row to the index.
void	addBufferedRows(List<String> bufferNames)	Add all the index data from the buffers to the index.
void	addRowsToBuffer(List<Row> rows, String bufferName)	Add the rows to a temporary storage (not to the index yet).
boolean	canFindNext()	Check if the index can get the next higher value.
boolean	canGetFirstOrLast()	Check if the index can directly look up the lowest or highest value of a column.
private void	checkUnique(boolean repeatableRead, TransactionMap<SearchRow, Value> map, SearchRow row, long newKey)
void	close(SessionLocal session)	Close this index.
private SearchRow	convertToKey(SearchRow r, Boolean minMax)
private Cursor	find(SessionLocal session, SearchRow first, boolean bigger, SearchRow last)
Cursor	find(SessionLocal session, SearchRow first, SearchRow last)	Find a row or a list of rows and create a cursor to iterate over the result.
Cursor	findFirstOrLast(SessionLocal session, boolean first)	Find the first (or last) value of this index.
Cursor	findNext(SessionLocal session, SearchRow higherThan, SearchRow last)	Find a row or a list of rows that is larger and create a cursor to iterate over the result.
double	getCost(SessionLocal session, int[] masks, TableFilter[] filters, int filter, SortOrder sortOrder, AllColumnsForPlan allColumnsSet)	Estimate the cost to search for rows given the search mask.
long	getDiskSpaceUsed()	Get the used disk space for this index.
private TransactionMap<SearchRow, Value>	getMap(SessionLocal session)	Get the map to store the data.
MVMap<SearchRow, VersionedValue<Value>>	getMVMap()
long	getRowCount(SessionLocal session)	Get the row count of this table, for the given session.
long	getRowCountApproximation(SessionLocal session)	Get the approximated row count for this table.
MVTable	getTable()	Get the table on which this index is based.
boolean	needRebuild()	Check if the index needs to be rebuilt.
private MVMap<SearchRow, Value>	openMap(String mapName)
void	remove(SessionLocal session)	Remove the index.
void	remove(SessionLocal session, Row row)	Remove a row from the index.
private boolean	rowsAreEqual(SearchRow rowOne, SearchRow rowTwo)
void	truncate(SessionLocal session)	Remove all rows from the index.
void	update(SessionLocal session, Row oldRow, Row newRow)	Update index after row change.

Methods inherited from class Index

canScan, checkIndexColumnTypes, compareRows, getColumnIndex, getColumns, getCostRangeIndex, getCreateSQL, getCreateSQLForCopy, getDuplicateKeyException, getDuplicatePrimaryKeyMessage, getIndexColumns, getIndexType, getPlanSQL, getRow, getRowFactory, getType, getUniqueColumnCount, getUniqueRowFactory, isFindUsingFullTableScan, isFirstColumn, isHidden, isRowIdIndex, mayHaveNullDuplicates, removeChildrenAndResources

Methods inherited from class SchemaObject

getSchema, getSQL, getSQL

Methods inherited from class DbObject

checkRename, getChildren, getComment, getCreateSQLForMeta, getDatabase, getDropSQL, getId, getModificationId, getName, invalidate, isTemporary, isValid, rename, setComment, setModified, setObjectName, setTemporary, toString

Methods inherited from class Object

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

Methods inherited from interface HasSQL

getTraceSQL

Field Details

mvTable

private final MVTable mvTable

The multi-value table.

dataMap

private final TransactionMap<SearchRow, Value> dataMap

Constructor Details

MVSecondaryIndex

public MVSecondaryIndex(Database db,
 MVTable table,
 int id,
 String indexName,
 IndexColumn[] columns,
 int uniqueColumnCount,
 IndexType indexType)

Method Details

addRowsToBuffer

public void addRowsToBuffer(List<Row> rows,
 String bufferName)

Description copied from class: MVIndex

Add the rows to a temporary storage (not to the index yet). The rows are sorted by the index columns. This is to more quickly build the index.

Specified by:

addRowsToBuffer in class MVIndex<SearchRow, Value>

Parameters:

rows - the rows

bufferName - the name of the temporary storage

addBufferedRows

public void addBufferedRows(List<String> bufferNames)

Description copied from class: MVIndex

Add all the index data from the buffers to the index. The index will typically use merge sort to add the data more quickly in sorted order.

Specified by:

addBufferedRows in class MVIndex<SearchRow, Value>

Parameters:

bufferNames - the names of the temporary storage

openMap

private MVMap<SearchRow, Value> openMap(String mapName)

close

public void close(SessionLocal session)

Description copied from class: Index

Close this index.

Specified by:

close in class Index

Parameters:

session - the session used to write data

add

public void add(SessionLocal session,
 Row row)

Description copied from class: Index

Add a row to the index.

Specified by:

add in class Index

Parameters:

session - the session to use

row - the row to add

checkUnique

private void checkUnique(boolean repeatableRead,
 TransactionMap<SearchRow, Value> map,
 SearchRow row,
 long newKey)

remove

public void remove(SessionLocal session,
 Row row)

Description copied from class: Index

Remove a row from the index.

Specified by:

remove in class Index

Parameters:

session - the session

row - the row

update

public void update(SessionLocal session,
 Row oldRow,
 Row newRow)

Description copied from class: Index

Update index after row change.

Overrides:

update in class Index

Parameters:

session - the session

oldRow - row before the update

newRow - row after the update

rowsAreEqual

private boolean rowsAreEqual(SearchRow rowOne,
 SearchRow rowTwo)

find

public Cursor find(SessionLocal session,
 SearchRow first,
 SearchRow last)

Description copied from class: Index

Find a row or a list of rows and create a cursor to iterate over the result.

Specified by:

find in class Index

Parameters:

session - the session

first - the first row, or null for no limit

last - the last row, or null for no limit

Returns:

the cursor to iterate over the results

find

private Cursor find(SessionLocal session,
 SearchRow first,
 boolean bigger,
 SearchRow last)

convertToKey

private SearchRow convertToKey(SearchRow r,
 Boolean minMax)

getTable

public MVTable getTable()

Description copied from class: Index

Get the table on which this index is based.

Overrides:

getTable in class Index

Returns:

the table

getCost

public double getCost(SessionLocal session,
 int[] masks,
 TableFilter[] filters,
 int filter,
 SortOrder sortOrder,
 AllColumnsForPlan allColumnsSet)

Description copied from class: Index

Estimate the cost to search for rows given the search mask. There is one element per column in the search mask. For possible search masks, see IndexCondition.

Specified by:

getCost in class Index

Parameters:

session - the session

masks - per-column comparison bit masks, null means 'always false', see constants in IndexCondition

filters - all joined table filters

filter - the current table filter index

sortOrder - the sort order

allColumnsSet - the set of all columns

Returns:

the estimated cost

remove

public void remove(SessionLocal session)

Description copied from class: Index

Remove the index.

Specified by:

remove in class Index

Parameters:

session - the session

truncate

public void truncate(SessionLocal session)

Description copied from class: Index

Remove all rows from the index.

Specified by:

truncate in class Index

Parameters:

session - the session

canGetFirstOrLast

public boolean canGetFirstOrLast()

Description copied from class: Index

Check if the index can directly look up the lowest or highest value of a column.

Overrides:

canGetFirstOrLast in class Index

Returns:

true if it can

findFirstOrLast

public Cursor findFirstOrLast(SessionLocal session,
 boolean first)

Description copied from class: Index

Find the first (or last) value of this index. The cursor returned is positioned on the correct row, or on null if no row has been found.

Overrides:

findFirstOrLast in class Index

Parameters:

session - the session

first - true if the first (lowest for ascending indexes) or last value should be returned

Returns:

a cursor (never null)

needRebuild

public boolean needRebuild()

Description copied from class: Index

Check if the index needs to be rebuilt. This method is called after opening an index.

Specified by:

needRebuild in class Index

Returns:

true if a rebuild is required.

getRowCount

public long getRowCount(SessionLocal session)

Description copied from class: Index

Get the row count of this table, for the given session.

Specified by:

getRowCount in class Index

Parameters:

session - the session

Returns:

the row count

getRowCountApproximation

public long getRowCountApproximation(SessionLocal session)

Description copied from class: Index

Get the approximated row count for this table.

Specified by:

getRowCountApproximation in class Index

Parameters:

session - the session

Returns:

the approximated row count

getDiskSpaceUsed

public long getDiskSpaceUsed()

Description copied from class: Index

Get the used disk space for this index.

Overrides:

getDiskSpaceUsed in class Index

Returns:

the estimated number of bytes

canFindNext

public boolean canFindNext()

Description copied from class: Index

Check if the index can get the next higher value.

Overrides:

canFindNext in class Index

Returns:

true if it can

findNext

public Cursor findNext(SessionLocal session,
 SearchRow higherThan,
 SearchRow last)

Description copied from class: Index

Find a row or a list of rows that is larger and create a cursor to iterate over the result.

Overrides:

findNext in class Index

Parameters:

session - the session

higherThan - the lower limit (excluding)

last - the last row, or null for no limit

Returns:

the cursor

getMap

private TransactionMap<SearchRow, Value> getMap(SessionLocal session)

Get the map to store the data.

Parameters:

session - the session

Returns:

the map

getMVMap

public MVMap<SearchRow, VersionedValue<Value>> getMVMap()

Specified by:

getMVMap in class MVIndex<SearchRow, Value>