com.facebook.presto.sql.planner.iterative.rule

Class PruneJoinChildrenColumns

java.lang.Object

com.facebook.presto.sql.planner.iterative.rule.PruneJoinChildrenColumns

All Implemented Interfaces:

Rule<JoinNode>

public class PruneJoinChildrenColumns
extends Object
implements Rule<JoinNode>

Non-Cross joins support output variable selection, so make any project-off of child columns explicit in project nodes.

Nested Class Summary

Nested classes/interfaces inherited from interface com.facebook.presto.sql.planner.iterative.Rule

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor and Description
PruneJoinChildrenColumns()

Method Summary

Modifier and Type	Method and Description
Rule.Result	apply(JoinNode joinNode, 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 com.facebook.presto.sql.planner.iterative.Rule

isEnabled

Constructor Detail

PruneJoinChildrenColumns

public PruneJoinChildrenColumns()

Method Detail

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 joinNode,
                         Captures captures,
                         Rule.Context context)

Specified by:

apply in interface Rule<JoinNode>