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

Class PrunePatternRecognitionSourceColumns

java.lang.Object

io.trino.sql.planner.iterative.rule.PrunePatternRecognitionSourceColumns

All Implemented Interfaces:

Rule<PatternRecognitionNode>

public class PrunePatternRecognitionSourceColumns
extends Object
implements Rule<PatternRecognitionNode>

This rule restricts the inputs to PatternRecognitionNode based on which symbols are used by the inner structures of the PatternRecognitionNode. As opposite to PrunePattenRecognitionColumns rule, this rule is not aware of which output symbols of the PatternRecognitionNode are used by the upstream plan. Consequentially, it can only prune the inputs which are not exposed to the output. Such possibility applies only to PatternRecognitionNode with the option `ONE ROW PER MATCH`, where only the partitioning symbols are passed to output.

This rule is complementary to PrunePatternRecognitionColumns. It can prune PatternRecognitionNode's inputs in cases when there is no narrowing projection on top of the node.

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
PrunePatternRecognitionSourceColumns()

Method Summary

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

PrunePatternRecognitionSourceColumns

public PrunePatternRecognitionSourceColumns()

Method Details

getPattern

public Pattern<PatternRecognitionNode> getPattern()

Description copied from interface: Rule

Returns a pattern to which plan nodes this rule applies.

Specified by:

getPattern in interface Rule<PatternRecognitionNode>

apply

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

Specified by:

apply in interface Rule<PatternRecognitionNode>