Class PullUpLtgOverUnion

java.lang.Object

se.liu.ida.hefquin.engine.queryproc.impl.loptimizer.heuristics.PullUpLtgOverUnion

All Implemented Interfaces:

HeuristicForLogicalOptimization

public class PullUpLtgOverUnion
extends Object
implements HeuristicForLogicalOptimization

Constructor Summary

Constructors

Constructor	Description
PullUpLtgOverUnion()

Method Summary

Modifier and Type	Method	Description
LogicalPlan	apply(LogicalPlan inputPlan)	Applies this heuristics to the given plan and returns the resulting, potentially rewritten plan.
static boolean	checkIfLtgCanBeExtractedOverUnion(LogicalPlan unionPlan)	Check if l2g operator can be pulled up over union by checking: i) the root operator is a union (binary or multiway), ii) every subplan under this join has an l2g operator as its root, and iii) all these l2g operators have the same vocab.mapping
protected static LogicalPlan	extractLtgOverNaryOp(LogicalPlan inputPlan)

Methods inherited from class java.lang.Object

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

Constructor Details

PullUpLtgOverUnion

public PullUpLtgOverUnion()

Method Details

apply

public LogicalPlan apply(LogicalPlan inputPlan)

Description copied from interface: HeuristicForLogicalOptimization

Applies this heuristics to the given plan and returns the resulting, potentially rewritten plan.

Specified by:

apply in interface HeuristicForLogicalOptimization

checkIfLtgCanBeExtractedOverUnion

public static boolean checkIfLtgCanBeExtractedOverUnion(LogicalPlan unionPlan)

Check if l2g operator can be pulled up over union by checking: i) the root operator is a union (binary or multiway), ii) every subplan under this join has an l2g operator as its root, and iii) all these l2g operators have the same vocab.mapping

extractLtgOverNaryOp

protected static LogicalPlan extractLtgOverNaryOp(LogicalPlan inputPlan)