org.apache.derby.impl.sql.execute

Class IndexRowToBaseRowResultSet

java.lang.Object

org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl

org.apache.derby.impl.sql.execute.NoPutResultSetImpl

org.apache.derby.impl.sql.execute.IndexRowToBaseRowResultSet

All Implemented Interfaces:

CursorResultSet, NoPutResultSet, ResultSet, RowLocationRetRowSource, RowSource

 class IndexRowToBaseRowResultSet
extends NoPutResultSetImpl
implements CursorResultSet

Takes a result set with a RowLocation as the last column, and uses the RowLocation to get and return a row from the given base conglomerate. Normally, the input result set will be a TableScanResultSet scanning an index conglomerate.

Field Summary

Fields

Modifier and Type	Field and Description
private FormatableBitSet	accessedAllCols
FormatableBitSet	accessedHeapCols
private ConglomerateController	baseCC
(package private) RowLocation	baseRowLocation
private boolean	closeBaseCCHere
(package private) boolean	copiedFromSource
private DynamicCompiledOpenConglomInfo	dcoci
private boolean	forUpdate
private int[]	indexCols
java.lang.String	indexName
private GeneratedMethod	restriction
long	restrictionTime
private DataValueDescriptor[]	rowArray
private StaticCompiledOpenConglomInfo	scoci
NoPutResultSet	source

Fields inherited from class org.apache.derby.impl.sql.execute.NoPutResultSetImpl

checkNullCols, clonedExecRow, cncLen, resultSetNumber, targetResultSet

Fields inherited from class org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl

activation, beginTime, closeTime, compactRow, constructorTime, currentRow, endExecutionTime, finished, isOpen, isTopResultSet, nextTime, numOpens, openTime, optimizerEstimatedCost, optimizerEstimatedRowCount, resultDescription, rowsFiltered, rowsSeen, startExecutionTime, subqueryTrackingArray

Fields inherited from interface org.apache.derby.iapi.sql.ResultSet

CURRENT_RESULTSET_ONLY, ENTIRE_RESULTSET_TREE, ISAFTERLAST, ISBEFOREFIRST, ISFIRST, ISLAST

Fields inherited from interface org.apache.derby.iapi.sql.execute.NoPutResultSet

ABSOLUTE, FIRST, LAST, NEXT, PREVIOUS, RELATIVE

Constructor Summary

Constructors

Constructor and Description
IndexRowToBaseRowResultSet(long conglomId, int scociItem, Activation a, NoPutResultSet source, int resultRowAllocator, int resultSetNumber, java.lang.String indexName, int heapColRefItem, int allColRefItem, int heapOnlyColRefItem, int indexColMapItem, GeneratedMethod restriction, boolean forUpdate, double optimizerEstimatedRowCount, double optimizerEstimatedCost)

Method Summary

Methods

Modifier and Type	Method and Description
void	close() If the result set has been opened, close the open scan.
ExecRow	getCurrentRow() Gets last row returned.
ExecRow	getNextRowCore() Return the requested values computed from the next row (if any) for which the restriction evaluates to true.
RowLocation	getRowLocation() Return the RowLocation of the base row.
long	getTimeSpent(int type) Return the total amount of time spent in this ResultSet
boolean	isForUpdate() Is this ResultSet or it's source result set for update.
void	openCore() open this ResultSet.
void	positionScanAtRowLocation(RowLocation rl) Positions the cursor in the specified rowLocation.
void	reopenCore() reopen this ResultSet.

Methods inherited from class org.apache.derby.impl.sql.execute.NoPutResultSetImpl

clearCurrentRow, clearOrderableCache, closeRowSource, getCursorName, getNextRowFromRowSource, getResultDescription, getValidColumns, markRowAsDeleted, needsRowLocation, needsToClone, printQualifiers, resultSetNumber, rowLocation, setCurrentRow, setNeedsRowLocation, setTargetResultSet, skipRow, skipScan, updateRow

Methods inherited from class org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl

addWarning, attachStatementContext, checkCancellationFlag, checkRowPosition, cleanUp, dumpTimeStats, finish, finishAndRTS, getAbsoluteRow, getActivation, getAutoGeneratedKeysResultset, getBeginExecutionTimestamp, getCompactRow, getCurrentTimeMillis, getElapsedMillis, getEndExecutionTimestamp, getEstimatedRowCount, getExecuteTime, getExecutionFactory, getFirstRow, getLanguageConnectionContext, getLastRow, getNextRow, getPointOfAttachment, getPreviousRow, getRelativeRow, getRowNumber, getScanIsolationLevel, getSubqueryTrackingArray, getTransactionController, getWarnings, isClosed, isXplainOnlyMode, markAsTopResultSet, modifiedRowCount, open, recordConstructorTime, requiresRelocking, returnsRows, setAfterLastRow, setBeforeFirstRow, setCompactRow, setCompatRow

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.derby.iapi.sql.ResultSet

addWarning, checkRowPosition, cleanUp, clearCurrentRow, finish, getAbsoluteRow, getActivation, getAutoGeneratedKeysResultset, getBeginExecutionTimestamp, getCursorName, getEndExecutionTimestamp, getExecuteTime, getFirstRow, getLastRow, getNextRow, getPreviousRow, getRelativeRow, getResultDescription, getRowNumber, getSubqueryTrackingArray, getWarnings, isClosed, modifiedRowCount, open, returnsRows, setAfterLastRow, setBeforeFirstRow

Field Detail

source

public NoPutResultSet source

restriction

private GeneratedMethod restriction

accessedHeapCols

public FormatableBitSet accessedHeapCols

accessedAllCols

private FormatableBitSet accessedAllCols

indexName

public java.lang.String indexName

indexCols

private int[] indexCols

dcoci

private DynamicCompiledOpenConglomInfo dcoci

scoci

private StaticCompiledOpenConglomInfo scoci

baseCC

private ConglomerateController baseCC

closeBaseCCHere

private boolean closeBaseCCHere

forUpdate

private boolean forUpdate

rowArray

private DataValueDescriptor[] rowArray

baseRowLocation

RowLocation baseRowLocation

copiedFromSource

boolean copiedFromSource

restrictionTime

public long restrictionTime

Constructor Detail

IndexRowToBaseRowResultSet

IndexRowToBaseRowResultSet(long conglomId,
                          int scociItem,
                          Activation a,
                          NoPutResultSet source,
                          int resultRowAllocator,
                          int resultSetNumber,
                          java.lang.String indexName,
                          int heapColRefItem,
                          int allColRefItem,
                          int heapOnlyColRefItem,
                          int indexColMapItem,
                          GeneratedMethod restriction,
                          boolean forUpdate,
                          double optimizerEstimatedRowCount,
                          double optimizerEstimatedCost)
                     throws StandardException

Throws:

StandardException

Method Detail

openCore

public void openCore()
              throws StandardException

open this ResultSet.

Specified by:

openCore in interface NoPutResultSet

Throws:

StandardException - thrown if cursor finished.

reopenCore

public void reopenCore()
                throws StandardException

reopen this ResultSet.

Specified by:

reopenCore in interface NoPutResultSet

Overrides:

reopenCore in class BasicNoPutResultSetImpl

Throws:

StandardException - thrown if cursor finished.

See Also:

NoPutResultSet.openCore()

getNextRowCore

public ExecRow getNextRowCore()
                       throws StandardException

Return the requested values computed from the next row (if any) for which the restriction evaluates to true.

restriction and projection parameters are evaluated for each row.

Specified by:

getNextRowCore in interface NoPutResultSet

Specified by:

getNextRowCore in class BasicNoPutResultSetImpl

Returns:

the next row in the result

Throws:

StandardException - thrown on failure.

StandardException - ResultSetNotOpen thrown if not yet open.

See Also:

NoPutResultSet.getNextRowCore()

close

public void close()
           throws StandardException

If the result set has been opened, close the open scan.

Specified by:

close in interface ResultSet

Overrides:

close in class NoPutResultSetImpl

Throws:

StandardException - thrown on error

getTimeSpent

public long getTimeSpent(int type)

Return the total amount of time spent in this ResultSet

Specified by:

getTimeSpent in interface ResultSet

Parameters:

type - CURRENT_RESULTSET_ONLY - time spent only in this ResultSet ENTIRE_RESULTSET_TREE - time spent in this ResultSet and below.

Returns:

long The total amount of time spent (in milliseconds).

getRowLocation

public RowLocation getRowLocation()
                           throws StandardException

Return the RowLocation of the base row.

Specified by:

getRowLocation in interface CursorResultSet

Returns:

the row location of the current cursor row.

Throws:

StandardException - thrown on failure.

See Also:

CursorResultSet

positionScanAtRowLocation

public void positionScanAtRowLocation(RowLocation rl)
                               throws StandardException

Description copied from interface: NoPutResultSet

Positions the cursor in the specified rowLocation. Used for scrollable insensitive result sets in order to position the cursor back to a row that has already be visited.

Specified by:

positionScanAtRowLocation in interface NoPutResultSet

Overrides:

positionScanAtRowLocation in class NoPutResultSetImpl

Parameters:

rl - row location of the current cursor row

Throws:

StandardException - thrown on failure to get location from storage engine

See Also:

Also remembers row location so that subsequent invocations of getCurrentRow will not read the index row to look up the row location base row, but reuse the saved row location.

getCurrentRow

public ExecRow getCurrentRow()
                      throws StandardException

Gets last row returned.

Specified by:

getCurrentRow in interface CursorResultSet

Returns:

the last row returned.

Throws:

StandardException - thrown on failure.

See Also:

CursorResultSet

isForUpdate

public boolean isForUpdate()

Is this ResultSet or it's source result set for update. beetle 3865: updateable cursor using index scan. We didn't need this function before because we couldn't use index for update cursor.

Specified by:

isForUpdate in interface NoPutResultSet

Overrides:

isForUpdate in class NoPutResultSetImpl

Returns:

Whether or not the result set is for update.