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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0; you may not use this file except in compliance with the Elastic License
* 2.0.
*/
package org.elasticsearch.xpack.esql.expression.function;
/**
* Marker interface indicating that a function accepts one optional argument (typically the last one).
* This is used by the {@link EsqlFunctionRegistry} to perform validation of function declaration.
*/
public interface OptionalArgument {
}