org.apache.derby.impl.sql.compile

Class GroupByList

java.lang.Object

org.apache.derby.impl.sql.compile.QueryTreeNode

org.apache.derby.impl.sql.compile.QueryTreeNodeVector

org.apache.derby.impl.sql.compile.OrderedColumnList

org.apache.derby.impl.sql.compile.GroupByList

All Implemented Interfaces:

Node, Visitable

public class GroupByList
extends OrderedColumnList

A GroupByList represents the list of expressions in a GROUP BY clause in a SELECT statement.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) int	numGroupingColsAdded
(package private) boolean	rollup

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

AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX

Constructor Summary

Constructors

Constructor and Description
GroupByList()

Method Summary

Modifier and Type	Method and Description
void	addGroupByColumn(GroupByColumn column) Add a column to the list
(package private) void	bindGroupByColumns(SelectNode select, java.util.List aggregateVector) Bind the group by list.
GroupByColumn	findGroupingColumn(ValueNode node) Find the matching grouping column if any for the given expression
GroupByColumn	getGroupByColumn(int position) Get a column from the list
int	getNumNeedToAddGroupingCols() Get the number of grouping columns that need to be added to the SELECT list.
boolean	isRollup()
void	preprocess(int numTables, FromList fromList, SubqueryList whereSubquerys, PredicateList wherePredicates)
void	remapColumnReferencesToExpressions() Remap all ColumnReferences in this tree to be clones of the underlying expression.
void	setRollup()
java.lang.String	toString() Convert this object to a String.

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

getColumnOrdering

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

acceptChildren, addElement, destructiveAppend, elementAt, indexOf, insertElementAt, nondestructiveAppend, printSubNodes, remove, removeAllElements, removeElement, removeElementAt, setElementAt, size

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

accept, bindOffsetFetch, bindRowMultiSet, bindUserCatalogType, bindUserType, checkReliability, checkReliability, convertDefaultNode, createTypeDependency, debugFlush, debugPrint, disablePrivilegeCollection, formatNodeString, foundString, generate, generateAuthorizeCheck, getBeginOffset, getClassFactory, getCompilerContext, getContextManager, getCursorInfo, getDataDictionary, getDependencyManager, getEndOffset, getExecutionFactory, getGenericConstantActionFactory, getIntProperty, getLanguageConnectionContext, getNodeFactory, getNodeType, getNullNode, getParameterTypes, getSchemaDescriptor, getSchemaDescriptor, getStatementType, getTableDescriptor, getTypeCompiler, init, init, init, init, init, init, init, init, init, init, init, init, init, init, isAtomic, isInstanceOf, isPrivilegeCollectionRequired, isSessionSchema, isSessionSchema, makeConstantAction, makeTableName, makeTableName, nodeHeader, orReliability, parseStatement, printLabel, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setContextManager, setEndOffset, setNodeType, setRefActionInfo, stackPrint, treePrint, treePrint, verifyClassExist

Methods inherited from class java.lang.Object

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

Field Detail

numGroupingColsAdded

int numGroupingColsAdded

rollup

boolean rollup

Constructor Detail

GroupByList

public GroupByList()

Method Detail

addGroupByColumn

public void addGroupByColumn(GroupByColumn column)

Add a column to the list

Parameters:

column - The column to add to the list

getGroupByColumn

public GroupByColumn getGroupByColumn(int position)

Get a column from the list

Parameters:

position - The column to get from the list

setRollup

public void setRollup()

isRollup

public boolean isRollup()

getNumNeedToAddGroupingCols

public int getNumNeedToAddGroupingCols()

Get the number of grouping columns that need to be added to the SELECT list.

Returns:

int The number of grouping columns that need to be added to the SELECT list.

bindGroupByColumns

void bindGroupByColumns(SelectNode select,
                        java.util.List aggregateVector)
                 throws StandardException

Bind the group by list. Verify: o Number of grouping columns matches number of non-aggregates in SELECT's RCL. o Names in the group by list are unique o Names of grouping columns match names of non-aggregate expressions in SELECT's RCL.

Parameters:

select - The SelectNode

aggregateVector - The aggregate vector being built as we find AggregateNodes

Throws:

StandardException - Thrown on error

findGroupingColumn

public GroupByColumn findGroupingColumn(ValueNode node)
                                 throws StandardException

Find the matching grouping column if any for the given expression

Parameters:

node - an expression for which we are trying to find a match in the group by list.

Returns:

the matching GroupByColumn if one exists, null otherwise.

Throws:

StandardException

remapColumnReferencesToExpressions

public void remapColumnReferencesToExpressions()
                                        throws StandardException

Remap all ColumnReferences in this tree to be clones of the underlying expression.

Throws:

StandardException - Thrown on error

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

preprocess

public void preprocess(int numTables,
                       FromList fromList,
                       SubqueryList whereSubquerys,
                       PredicateList wherePredicates)
                throws StandardException

Throws:

StandardException