elasticsearch/docs/reference/esql/functions/mv_last.asciidoc

[discrete]
[[esql-mv_last]]
=== `MV_LAST`

*Syntax*

[.text-center]
image::esql/functions/signature/mv_last.svg[Embedded,opts=inline]

*Parameters*

`v`::
Multivalue expression.

*Description*

Converts a multivalue expression into a single valued column containing the last
value. This is most useful when reading from a function that emits multivalued
columns in a known order like <<esql-split>>.

The order that <<esql-multivalued-fields, multivalued fields>> are read from
underlying storage is not guaranteed. It is *frequently* ascending, but don't
rely on that. If you need the maximum value use <<esql-mv_max>> instead of
`MV_LAST`. `MV_MAX` has optimizations for sorted values so there isn't a
performance benefit to `MV_LAST`.

include::types/mv_last.asciidoc[]

*Example*

[source.merge.styled,esql]
----
include::{esql-specs}/string.csv-spec[tag=mv_last]
----
[%header.monospaced.styled,format=dsv,separator=|]
|===
include::{esql-specs}/string.csv-spec[tag=mv_last-result]
|===