OrderedColumn (Apache Derby V10.14 Internals)

java.lang.Object
- org.apache.derby.impl.sql.compile.QueryTreeNode
- - org.apache.derby.impl.sql.compile.OrderedColumn

All Implemented Interfaces:

Visitable

Direct Known Subclasses:

GroupByColumn, OrderByColumn
```
public abstract class OrderedColumn
extends QueryTreeNode
```
An ordered column has position. It is an abstract class for group by and order by columns.

Field Summary

Fields
Modifier and Type Field Description

protected int columnPosition

protected static int UNMATCHEDPOSITION
- Fields inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode
  AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_CYCLE, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX

Fields
Modifier and Type	Field	Description
`protected int`	`columnPosition`
`protected static int`	`UNMATCHEDPOSITION`

Constructor Summary

Constructors
Constructor Description

OrderedColumn(ContextManager cm)

Constructors
Constructor	Description
`OrderedColumn(ContextManager cm)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`(package private) int`	`getColumnPosition()`	Get the position of this column
`(package private) boolean`	`isAscending()`	Indicate whether this column is ascending or not.
`(package private) boolean`	`isNullsOrderedLow()`	Indicate whether this column should be ordered NULLS low.
`(package private) void`	`setColumnPosition(int columnPosition)`	Set the position of this column
`java.lang.String`	`toString()`	Convert this object to a String.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode
accept, acceptChildren, addTag, addUDTUsagePriv, addUDTUsagePriv, bindOffsetFetch, bindRowMultiSet, bindUserCatalogType, bindUserType, checkReliability, checkReliability, convertDefaultNode, copyTagsFrom, createTypeDependency, debugFlush, debugPrint, disablePrivilegeCollection, formatNodeString, generate, generateAuthorizeCheck, getBeginOffset, getClassFactory, getCompilerContext, getContext, getContextManager, getDataDictionary, getDependencyManager, getEndOffset, getExecutionFactory, getGenericConstantActionFactory, getIntProperty, getLanguageConnectionContext, getLongProperty, getNullNode, getOffsetOrderedNodes, getOptimizerFactory, getOptimizerTracer, getParameterTypes, getSchemaDescriptor, getSchemaDescriptor, getStatementType, getTableDescriptor, getTypeCompiler, getUDTDesc, isAtomic, isPrivilegeCollectionRequired, isSessionSchema, isSessionSchema, makeConstantAction, makeTableName, makeTableName, nodeHeader, optimizerTracingIsOn, orReliability, parseSearchCondition, parseStatement, printLabel, printSubNodes, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setEndOffset, setRefActionInfo, stackPrint, taggedWith, treePrint, treePrint, verifyClassExist

- Field Detail
  - UNMATCHEDPOSITION
```
protected static final int UNMATCHEDPOSITION
```
    See Also:
    
    Constant Field Values
  - columnPosition
```
protected int columnPosition
```
- Constructor Detail
  - OrderedColumn
```
public OrderedColumn(ContextManager cm)
```
- Method Detail
  - isAscending
```
boolean isAscending()
```
    Indicate whether this column is ascending or not. By default assume that all ordered columns are necessarily ascending. If this class is inherited by someone that can be desceneded, they are expected to override this method.
    
    Returns:
    
    true
  - isNullsOrderedLow
```
boolean isNullsOrderedLow()
```
    Indicate whether this column should be ordered NULLS low. By default we assume that all ordered columns are ordered with NULLS higher than non-null values. If this class is inherited by someone that can be specified to have NULLs ordered lower than non-null values, they are expected to override this method.
    
    Returns:
    
    false
  - toString
```
public java.lang.String toString()
```
    Convert this object to a String. See comments in QueryTreeNode.java for how this should be done for tree printing.
    
    Overrides:
    
    toString in class QueryTreeNode
    
    Returns:
    
    This object as a String
  - getColumnPosition
```
int getColumnPosition()
```
    Get the position of this column
    
    Returns:
    
    The position of this column
  - setColumnPosition
```
void setColumnPosition(int columnPosition)
```
    Set the position of this column

Class OrderedColumn

Field Summary

Fields inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode

Field Detail

UNMATCHEDPOSITION

columnPosition

Constructor Detail

OrderedColumn

Method Detail

isAscending

isNullsOrderedLow

toString

getColumnPosition

setColumnPosition