IndexRow (Apache Derby V10.14 Internals)

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

All Implemented Interfaces:

ExecIndexRow, ExecRow, Row
```
class IndexRow
extends ValueRow
implements ExecIndexRow
```
Basic implementation of ExecIndexRow.

Field Summary

Fields
Modifier and Type Field Description

private boolean[] orderedNulls

Fields
Modifier and Type	Field	Description
`private boolean[]`	`orderedNulls`

Constructor Summary

Constructors
Constructor Description

IndexRow(int ncols)

Constructors
Constructor	Description
`IndexRow(int ncols)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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 interface org.apache.derby.iapi.sql.execute.ExecRow
cloneColumn, getClone, getClone, getNewNullRow, getNewObjectArray, getRowArray, getRowArrayClone, resetRowArray, setRowArray

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.Row
getColumn, nColumns, setColumn

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

- 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

Class IndexRow

Field Summary

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

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

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

Field Detail

orderedNulls

Constructor Detail

IndexRow

Method Detail

orderedNulls

areNullsOrdered

execRowToExecIndexRow

cloneMe