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

Class WarnLostSortOrder

java.lang.Object

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

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

public final class WarnLostSortOrder
extends Rule<LogicalPlan,LogicalPlan>

Warns when a SORT or TopN is followed by a LOOKUP JOIN which does not preserve order, and there is no subsequent SORT to restore the order.

For example:

 FROM test | SORT x | LOOKUP JOIN lookup ON key | LIMIT 10
 

will produce a warning because the SORT order is lost by the LOOKUP JOIN.

But:

 FROM test | SORT x | LOOKUP JOIN lookup ON key | SORT y | LIMIT 10
 

will NOT produce a warning because the final SORT restores a defined order.

Field Summary

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

log

Constructor Summary

Constructors

Constructor	Description
WarnLostSortOrder()

Method Summary

Modifier and Type	Method	Description
LogicalPlan	apply(LogicalPlan plan)

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

WarnLostSortOrder

public WarnLostSortOrder()

Method Details

apply

public LogicalPlan apply(LogicalPlan plan)

Specified by:

apply in class Rule<LogicalPlan,LogicalPlan>