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

Class UnwrapSingleColumnRowInApply

java.lang.Object

io.trino.sql.planner.iterative.rule.UnwrapSingleColumnRowInApply

All Implemented Interfaces:

Rule<ApplyNode>

public class UnwrapSingleColumnRowInApply
extends Object
implements Rule<ApplyNode>

Given x::row(t) and y::row(t), converts assignments of the form

x IN (y...)</code> => <code>x[1] IN (y[1]...)

and

x <comparison> <quantifier> (y...) => x[1] <comparison> <quantifier> (y[1]...)

In particular, it transforms a plan with the following shape:

 - Apply x IN y
   - S [x :: row(T)]
   - Q [y :: row(T)]
 

into

 - Project (to preserve the outputs of Apply)
   - Apply x' IN y'
     - Project [x' :: T]
         x' = x[1]
       - S [x :: row(T)]
     - Project [y' :: T]
         y' = y[1]
       - Q [y :: row(T)]
 

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
UnwrapSingleColumnRowInApply()

Method Summary

Modifier and Type	Method	Description
Rule.Result	apply(ApplyNode node, Captures captures, Rule.Context context)
Pattern<ApplyNode>	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

UnwrapSingleColumnRowInApply

public UnwrapSingleColumnRowInApply()

Method Details

getPattern

public Pattern<ApplyNode> getPattern()

Description copied from interface: Rule

Returns a pattern to which plan nodes this rule applies.

Specified by:

getPattern in interface Rule<ApplyNode>

apply

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

Specified by:

apply in interface Rule<ApplyNode>