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

Class PruneEmptyAggregates

java.lang.Object

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

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

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

public final class PruneEmptyAggregates
extends OptimizerRules.OptimizerRule<Aggregate>

STATS with no aggregates and no groupings can be replaced with a single, empty row. This can happen due to expression pruning at optimization time, after all them are dropped, eg. STATS a = count(*) by b | drop a, b

Field Summary

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

log

Constructor Summary

Constructors

Constructor	Description
PruneEmptyAggregates()

Method Summary

Modifier and Type	Method	Description
protected LogicalPlan	rule(Aggregate agg)

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

PruneEmptyAggregates

public PruneEmptyAggregates()

Method Details

rule

protected LogicalPlan rule(Aggregate agg)

Specified by:

rule in class OptimizerRules.OptimizerRule<Aggregate>