elasticsearch/docs/reference/esql/processing-commands/eval.asciidoc

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[[esql-eval]]
=== `EVAL`
`EVAL` enables you to add new columns to the end of a table:
[source,esql]
----
include::{esql-specs}/docs.csv-spec[tag=eval]
----
Returns:
[%header,format=dsv,separator=|]
|===
include::{esql-specs}/docs.csv-spec[tag=eval-result]
|===
If the specified column already exists, the existing column will be dropped, and
the new column will be appended to the table:
[source,esql]
----
include::{esql-specs}/docs.csv-spec[tag=evalReplace]
----
Returns:
[%header,format=dsv,separator=|]
|===
include::{esql-specs}/docs.csv-spec[tag=evalReplace-result]
|===
[discrete]
==== Functions
`EVAL` supports various functions for calculating values. Refer to
<<esql-functions,Functions>> for more information.