org.aksw.sparqlify.core.algorithms

Class SqlOptimizerImpl

java.lang.Object

org.aksw.sparqlify.core.algorithms.SqlOptimizerImpl

public class SqlOptimizerImpl
extends Object

Constructor Summary

Constructors

Constructor and Description
SqlOptimizerImpl(org.aksw.commons.util.jdbc.Schema dbSchema)

Method Summary

Methods

Modifier and Type	Method and Description
static List<SqlOp>	collectJoins(SqlOp sqlOp)
static void	collectJoins(SqlOp sqlOp, List<SqlOp> result)
org.aksw.sparqlify.core.algorithms.SelfJoinResult	eliminateSelfJoins(List<SqlOp> ops, List<Collection<SqlExpr>> cnf)
static boolean	isEqualsExpr(SqlExpr expr)
static void	opt(SqlOpSelectBlock op)
org.aksw.sparqlify.core.algorithms.SqlOptimizerImpl.OptResult	opt(SqlOpSelectBlock op, Set<S_ColumnRef> references)
static org.aksw.sparqlify.core.algorithms.SqlOptimizerImpl.OptResult	opt(SqlOp op, Set<S_ColumnRef> references)
void	optimize(SqlOp op)
static void	substituteProjectionInPlace(Projection proj, Factory1<SqlExpr> transformer)
static List<SqlSortCondition>	transformSortConditions(List<SqlSortCondition> sortConditions, Factory1<SqlExpr> transformer)
static <T> Map<T,T>	transitiveMapInPlace(Map<T,T> map) Assumes that the values in the map form a tree from child to parent.

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlOptimizerImpl

public SqlOptimizerImpl(org.aksw.commons.util.jdbc.Schema dbSchema)

Method Detail

opt

public static void opt(SqlOpSelectBlock op)

transitiveMapInPlace

public static <T> Map<T,T> transitiveMapInPlace(Map<T,T> map)

Assumes that the values in the map form a tree from child to parent. The resulting map will map each node directly to its root.

Parameters:

map -

Returns:

isEqualsExpr

public static boolean isEqualsExpr(SqlExpr expr)

eliminateSelfJoins

public org.aksw.sparqlify.core.algorithms.SelfJoinResult eliminateSelfJoins(List<SqlOp> ops,
                                                                   List<Collection<SqlExpr>> cnf)

Parameters:

ops -

cnf - cnf of the conditions

opt

public static org.aksw.sparqlify.core.algorithms.SqlOptimizerImpl.OptResult opt(SqlOp op,
                                                                Set<S_ColumnRef> references)

opt

public org.aksw.sparqlify.core.algorithms.SqlOptimizerImpl.OptResult opt(SqlOpSelectBlock op,
                                                                Set<S_ColumnRef> references)

substituteProjectionInPlace

public static void substituteProjectionInPlace(Projection proj,
                               Factory1<SqlExpr> transformer)

transformSortConditions

public static List<SqlSortCondition> transformSortConditions(List<SqlSortCondition> sortConditions,
                                             Factory1<SqlExpr> transformer)

optimize

public void optimize(SqlOp op)

collectJoins

public static List<SqlOp> collectJoins(SqlOp sqlOp)

collectJoins

public static void collectJoins(SqlOp sqlOp,
                List<SqlOp> result)