org.apache.derby.impl.sql.execute
Class IndexRow

java.lang.Object
  org.apache.derby.impl.sql.execute.ValueRow
      org.apache.derby.impl.sql.execute.IndexRow

All Implemented Interfaces:

ExecIndexRow, ExecRow, Row

public class IndexRow
extends ValueRow
implements ExecIndexRow

Basic implementation of ExecIndexRow.

Field Summary

private boolean[]

orderedNulls

Constructor Summary

IndexRow(int ncols)

Method Summary

boolean	areNullsOrdered(int columnPosition) Return true if orderedNulls was called on this ExecIndexRow for the given column position.
(package private) ExecRow	cloneMe()
void	execRowToExecIndexRow(ExecRow valueRow) Turn the ExecRow into an ExecIndexRow.
void	orderedNulls(int columnPosition) These two methods are a sort of a hack.

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

cloneColumn, getClone, getClone, getColumn, getNewNullRow, getNewObjectArray, getRowArray, getRowArrayClone, nColumns, realloc, resetRowArray, setColumn, setRowArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.derby.iapi.sql.execute.ExecRow

cloneColumn, getClone, getClone, getNewNullRow, getNewObjectArray, getRowArray, getRowArrayClone, resetRowArray, setRowArray

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

getColumn, nColumns, setColumn

Field Detail

orderedNulls

private boolean[] orderedNulls

Constructor Detail

IndexRow

IndexRow(int ncols)

Method Detail

orderedNulls

public void orderedNulls(int columnPosition)

Description copied from interface: ExecIndexRow

These two methods are a sort of a hack. The store implements ordered null semantics for start and stop positioning, which is correct for IS NULL and incorrect for everything else. To work around this, TableScanResultSet will check whether the start and stop positions have NULL in any column position other than for an IS NULL check. If so, it won't do the scan (that is, it will return no rows). This method is to inform this ExecIndexRow (which can be used for start and stop positioning) that the given column uses ordered null semantics.

Specified by:

orderedNulls in interface ExecIndexRow

Parameters:

columnPosition - The position of the column that uses ordered null semantics (zero-based).

areNullsOrdered

public boolean areNullsOrdered(int columnPosition)

Description copied from interface: ExecIndexRow

Return true if orderedNulls was called on this ExecIndexRow for the given column position.

Specified by:

areNullsOrdered in interface ExecIndexRow

Parameters:

columnPosition - The position of the column (zero-based) for which we want to check if ordered null semantics are used.

Returns:

true if we are to use ordered null semantics on the given column

execRowToExecIndexRow

public void execRowToExecIndexRow(ExecRow valueRow)

Turn the ExecRow into an ExecIndexRow.

Specified by:

execRowToExecIndexRow in interface ExecIndexRow

cloneMe

ExecRow cloneMe()

Overrides:

cloneMe in class ValueRow