Package org.elasticsearch.xpack.esql.optimizer.rules.logical

Class PruneLiteralsInLimitBy

java.lang.Object

org.elasticsearch.xpack.esql.rule.Rule<LimitBy,LogicalPlan>

org.elasticsearch.xpack.esql.optimizer.rules.logical.OptimizerRules.OptimizerRule<LimitBy>

org.elasticsearch.xpack.esql.optimizer.rules.logical.PruneLiteralsInLimitBy

public final class PruneLiteralsInLimitBy
extends OptimizerRules.OptimizerRule<LimitBy>

Prune foldable groupings from LIMIT BY. A foldable expression evaluates to the same constant for every row, so it has no grouping effect. If all groupings are foldable the LIMIT BY degenerates to a plain LIMIT. Groupings arrive from the parser as either raw Attributes or Alias nodes wrapping the expression. Expression.foldable() is always false, so we unwrap to check the child.

Field Summary

Fields inherited from class org.elasticsearch.xpack.esql.rule.Rule

log

Constructor Summary

Constructors

Constructor	Description
PruneLiteralsInLimitBy()

Method Summary

Modifier and Type	Method	Description
protected LogicalPlan	rule(LimitBy limitBy)

Methods inherited from class org.elasticsearch.xpack.esql.optimizer.rules.logical.OptimizerRules.OptimizerRule

apply

Methods inherited from class org.elasticsearch.xpack.esql.rule.Rule

name, toString, typeToken

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

PruneLiteralsInLimitBy

public PruneLiteralsInLimitBy()

Method Details

rule

protected LogicalPlan rule(LimitBy limitBy)

Specified by:

rule in class OptimizerRules.OptimizerRule<LimitBy>