org.apache.derby.iapi.sql.execute
Interface ExecIndexRow

All Superinterfaces:
ExecRow, Row
All Known Implementing Classes:
IndexRow, IndexValueRow

public interface ExecIndexRow
extends ExecRow

This is an extension of ExecRow for use with indexes and sorting.


Method Summary
 boolean areNullsOrdered(int columnPosition)
          Return true if orderedNulls was called on this ExecIndexRow for the given column position.
 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 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
 

Method Detail

orderedNulls

void orderedNulls(int columnPosition)
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.

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

areNullsOrdered

boolean areNullsOrdered(int columnPosition)
Return true if orderedNulls was called on this ExecIndexRow for the given column position.

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

void execRowToExecIndexRow(ExecRow valueRow)
Turn the ExecRow into an ExecIndexRow.


Built on Thu 2011-03-10 11:54:14+0000, from revision ???

Apache Derby V10.6 Internals - Copyright © 2004,2007 The Apache Software Foundation. All Rights Reserved.