org.apache.ignite.internal.processors.query.h2.sql

Class SplitterQueryModel

java.lang.Object

org.apache.ignite.internal.processors.query.h2.sql.SplitterQueryModel

public final class SplitterQueryModel
extends Object

Simplified tree-like model for a query. - SELECT : All the children are list of joined query models in the FROM clause. - UNION : All the children are united left and right query models. - TABLE and FUNCTION : Never have child models.

Constructor Summary

Constructors

Constructor and Description
SplitterQueryModel(SplitterQueryModelType type, GridSqlAst parent, int childIdx, GridSqlAlias uniqueAlias) Constructor (no split).
SplitterQueryModel(SplitterQueryModelType type, GridSqlAst parent, int childIdx, GridSqlAlias uniqueAlias, boolean needSplit) Constructor.

Method Summary

Modifier and Type	Method and Description
void	analyzeQueryModel(boolean collocatedGrpBy) Analyze query model, setting split flags as needed.
<X extends GridSqlAst> X	ast()
void	buildQueryModel(GridSqlAst prnt, int childIdx, GridSqlAlias uniqueAlias) Prepare query model.
int	childIndex()
SplitterQueryModel	childModel(int idx) Get child model by index.
int	childModelsCount()
GridSqlJoin	findJoin(int idx)
void	forceSplit() Force split flag on a model.
boolean	isQuery()
void	moveChildModelsToWrapModel(SplitterQueryModel wrapModel, int begin, int end) Move child models to wrap model.
boolean	needSplit()
boolean	needSplitChild()
GridSqlAst	parent()
String	toString()
SplitterQueryModelType	type()
void	unionAll(boolean unionAll)
GridSqlAlias	uniqueAlias()

Methods inherited from class java.lang.Object

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

Constructor Detail

SplitterQueryModel

public SplitterQueryModel(SplitterQueryModelType type,
                          GridSqlAst parent,
                          int childIdx,
                          GridSqlAlias uniqueAlias)

Constructor (no split).

Parameters:

type - Type.

parent - Parent element.

childIdx - Child index.

uniqueAlias - Unique parent alias of the current element. May be null for selects inside of unions or top level queries.

SplitterQueryModel

public SplitterQueryModel(SplitterQueryModelType type,
                          GridSqlAst parent,
                          int childIdx,
                          GridSqlAlias uniqueAlias,
                          boolean needSplit)

Constructor.

Parameters:

type - Type.

parent - Parent element.

childIdx - Child index.

uniqueAlias - Unique parent alias of the current element. May be null for selects inside of unions or top level queries.

needSplit - Need split flag.

Method Detail

type

public SplitterQueryModelType type()

Returns:

Type.

isQuery

public boolean isQuery()

Returns:

true If this is a SELECT or UNION query model.

uniqueAlias

public GridSqlAlias uniqueAlias()

Returns:

Unique alias.

parent

public GridSqlAst parent()

Returns:

Parent AST element.

childIndex

public int childIndex()

Returns:

Child index.

ast

public <X extends GridSqlAst> X ast()

Returns:

The actual AST element for this model.

needSplit

public boolean needSplit()

Returns:

Whether split is needed.

needSplitChild

public boolean needSplitChild()

Returns:

Whether split of children is needed.

moveChildModelsToWrapModel

public void moveChildModelsToWrapModel(SplitterQueryModel wrapModel,
                                       int begin,
                                       int end)

Move child models to wrap model.

Parameters:

wrapModel - Wrap model.

begin - Child begin index.

end - Child end index.

forceSplit

public void forceSplit()

Force split flag on a model.

unionAll

public void unionAll(boolean unionAll)

Parameters:

unionAll - UNION ALL flag.

childModelsCount

public int childModelsCount()

Returns:

Number of child models.

childModel

public SplitterQueryModel childModel(int idx)

Get child model by index.

Parameters:

idx - Index.

Returns:

Child model.

buildQueryModel

public void buildQueryModel(GridSqlAst prnt,
                            int childIdx,
                            GridSqlAlias uniqueAlias)

Prepare query model.

Parameters:

prnt - Parent AST element.

childIdx - Child index.

uniqueAlias - Unique parent alias of the current element.

analyzeQueryModel

public void analyzeQueryModel(boolean collocatedGrpBy)

Analyze query model, setting split flags as needed.

Parameters:

collocatedGrpBy - Collocated GROUP BY flag.

findJoin

public GridSqlJoin findJoin(int idx)

Parameters:

idx - Index of the child model for which we need to find a respective JOIN element.

Returns:

JOIN.

toString

public String toString()

Overrides:

toString in class Object