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

Class PushDownDereferenceThroughUnnest

java.lang.Object

io.trino.sql.planner.iterative.rule.PushDownDereferenceThroughUnnest

All Implemented Interfaces:

Rule<ProjectNode>

public class PushDownDereferenceThroughUnnest
extends Object
implements Rule<ProjectNode>

Transforms:

  Project(D := f1(A.x), E := f2(C), B_BIGINT)
      Unnest(replicate = [A, C], unnest = (B_ARRAY -> [B_BIGINT]))
          Source(A, B_ARAAY, C)
  

to:

  Project(D := f1(symbol), E := f2(C), B_BIGINT)
      Unnest(replicate = [A, C, symbol], unnest = (B_ARAAY -> [B_BIGINT]))
          Project(A, B_ARRAY, C, symbol := A.x)
              Source(A, B_ARAAY, C)
 

Pushes down dereference projections through Unnest. Currently, the pushdown is only supported for dereferences on replicate symbols.

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
PushDownDereferenceThroughUnnest(IrTypeAnalyzer typeAnalyzer)

Method Summary

Modifier and Type	Method	Description
Rule.Result	apply(ProjectNode projectNode, 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.trino.sql.planner.iterative.Rule

isEnabled

Constructor Details

PushDownDereferenceThroughUnnest

public PushDownDereferenceThroughUnnest(IrTypeAnalyzer typeAnalyzer)

Method Details

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 projectNode,
 Captures captures,
 Rule.Context context)

Specified by:

apply in interface Rule<ProjectNode>