Package io.trino.sql.planner.iterative.rule

Class ReplaceRedundantJoinWithProject

java.lang.Object

io.trino.sql.planner.iterative.rule.ReplaceRedundantJoinWithProject

All Implemented Interfaces:

Rule<JoinNode>

public class ReplaceRedundantJoinWithProject
extends Object
implements Rule<JoinNode>

This rule is complementary to RemoveRedundantJoin. It transforms plans with outer join where outer source of the join is not empty, and the other source is empty. Outer join is replaced with the outer source and a project which appends nulls as the empty source's outputs.

Nested Class Summary

Nested classes/interfaces inherited from interface io.trino.sql.planner.iterative.Rule

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
ReplaceRedundantJoinWithProject()

Method Summary

Modifier and Type	Method	Description
Rule.Result	apply(JoinNode node, Captures captures, Rule.Context context)
Pattern<JoinNode>	getPattern()	Returns a pattern to which plan nodes this rule applies.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.trino.sql.planner.iterative.Rule

isEnabled

Constructor Details

ReplaceRedundantJoinWithProject

public ReplaceRedundantJoinWithProject()

Method Details

getPattern

public Pattern<JoinNode> getPattern()

Description copied from interface: Rule

Returns a pattern to which plan nodes this rule applies.

Specified by:

getPattern in interface Rule<JoinNode>

apply

public Rule.Result apply(JoinNode node,
 Captures captures,
 Rule.Context context)

Specified by:

apply in interface Rule<JoinNode>