Package io.prestosql.sql.planner.iterative.rule

Class InlineProjections

java.lang.Object

io.prestosql.sql.planner.iterative.rule.InlineProjections

All Implemented Interfaces:

Rule<ProjectNode>

public class InlineProjections
extends Object
implements Rule<ProjectNode>

Inlines expressions from a child project node into a parent project node as long as they are simple constants, or they are referenced only once (to avoid introducing duplicate computation) and the references don't appear within a TRY block (to avoid changing semantics).

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
InlineProjections()

Method Summary

Modifier and Type	Method	Description
Rule.Result	apply(ProjectNode parent, Captures captures, Rule.Context context)
Pattern<ProjectNode>	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.prestosql.sql.planner.iterative.Rule

isEnabled

Constructor Detail

InlineProjections

public InlineProjections()

Method Detail

getPattern

public Pattern<ProjectNode> getPattern()

Description copied from interface: Rule

Returns a pattern to which plan nodes this rule applies.

Specified by:

getPattern in interface Rule<ProjectNode>

apply

public Rule.Result apply(ProjectNode parent,
                         Captures captures,
                         Rule.Context context)

Specified by:

apply in interface Rule<ProjectNode>