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

[[esql-mv_median]]
=== `MV_MEDIAN`
Converts a multivalued field into a single valued field containing the median value. For example:

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

It can be used by any numeric field type and returns a value of the same type. If the
row has an even number of values for a column the result will be the average of the
middle two entries. If the field is not floating point then the average rounds *down*:

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