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

Class ReplaceLimitByExpressionWithEval

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.ReplaceLimitByExpressionWithEval

public final class ReplaceLimitByExpressionWithEval
extends OptimizerRules.OptimizerRule<LimitBy>

Extract non-attribute LimitBy grouping expressions into a synthetic Eval.

For example, LIMIT N BY languages * 2 becomes EVAL $$limit_by_0 = languages * 2 | LIMIT N BY $$limit_by_0. PushDownEval in the operators batch takes care of pushing the Eval below any OrderBy if present.

Foldable groupings are pruned separately by PruneLiteralsInLimitBy in the operators batch.

Field Summary

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

log

Constructor Summary

Constructors

Constructor	Description
ReplaceLimitByExpressionWithEval()

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

ReplaceLimitByExpressionWithEval

public ReplaceLimitByExpressionWithEval()

Method Details

rule

protected LogicalPlan rule(LimitBy limitBy)

Specified by:

rule in class OptimizerRules.OptimizerRule<LimitBy>