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<E>

org.apache.derby.impl.sql.compile.OrderedColumnList<GroupByColumn>

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

All Implemented Interfaces:

java.lang.Iterable<GroupByColumn>, Visitable

class GroupByList
extends OrderedColumnList<GroupByColumn>

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.QueryTreeNodeVector

eltClass

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

Constructor Summary

Constructors

Constructor and Description
GroupByList(ContextManager cm)

Method Summary

Modifier and Type	Method and Description
(package private) void	addGroupByColumn(GroupByColumn column) Add a column to the list
(package private) void	bindGroupByColumns(SelectNode select, java.util.List<AggregateNode> aggregates) Bind the group by list.
(package private) GroupByColumn	findGroupingColumn(ValueNode node) Find the matching grouping column if any for the given expression
(package private) GroupByColumn	getGroupByColumn(int position) Get a column from the list
(package private) int	getNumNeedToAddGroupingCols() Get the number of grouping columns that need to be added to the SELECT list.
(package private) boolean	isRollup()
(package private) void	preprocess(int numTables, FromList fromList, SubqueryList whereSubquerys, PredicateList wherePredicates)
(package private) void	remapColumnReferencesToExpressions() Remap all ColumnReferences in this tree to be clones of the underlying expression.
(package private) 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, iterator, nondestructiveAppend, printSubNodes, removeAllElements, removeElement, removeElementAt, setElementAt, size

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

accept, 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, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setEndOffset, setRefActionInfo, stackPrint, taggedWith, treePrint, treePrint, verifyClassExist

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

numGroupingColsAdded

int numGroupingColsAdded

rollup

boolean rollup

Constructor Detail

GroupByList

public GroupByList(ContextManager cm)

Method Detail

addGroupByColumn

void addGroupByColumn(GroupByColumn column)

Add a column to the list

Parameters:

column - The column to add to the list

getGroupByColumn

GroupByColumn getGroupByColumn(int position)

Get a column from the list

Parameters:

position - The column to get from the list

setRollup

void setRollup()

isRollup

boolean isRollup()

getNumNeedToAddGroupingCols

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<AggregateNode> aggregates)
                 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

aggregates - The aggregate list being built as we find AggregateNodes

Throws:

StandardException - Thrown on error

findGroupingColumn

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

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

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

Throws:

StandardException