[discrete]
[[esql-mv_sum]]
=== `MV_SUM`
Converts a multivalued field into a single valued field containing the sum
of all of the values. For example:

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

NOTE: The input type can be any number and the output type is the same as the input type.