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

Class PruneLiteralsInChangePointBy

java.lang.Object

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

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

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

public final class PruneLiteralsInChangePointBy
extends OptimizerRules.OptimizerRule<ChangePoint>

Prune foldable groupings from CHANGE_POINT BY. A foldable expression evaluates to the same constant for every row, so it has no grouping effect and can be dropped. Unlike PruneLiteralsInLimitBy, an all-foldable BY clause simply degenerates to an ungrouped CHANGE_POINT — there is no simpler plan node to substitute. Groupings arrive from the parser as either raw Attributes or Alias nodes wrapping the expression (introduced by ReplaceChangePointByExpressionWithEval). 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
PruneLiteralsInChangePointBy()

Method Summary

Modifier and Type	Method	Description
protected LogicalPlan	rule(ChangePoint changePoint)

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

PruneLiteralsInChangePointBy

public PruneLiteralsInChangePointBy()

Method Details

rule

protected LogicalPlan rule(ChangePoint changePoint)

Specified by:

rule in class OptimizerRules.OptimizerRule<ChangePoint>