elasticsearch/docs/reference/query-languages/esql/_snippets/functions/to_string.md

TO_STRING [esql-to_string]

Syntax

:::{image} ../../../../../images/to_string.svg :alt: Embedded :class: text-center :::

Parameters

field : Input value. The input can be a single- or multi-valued column or an expression.

Description

Converts an input value into a string.

Supported types

field	result
boolean	keyword
cartesian_point	keyword
cartesian_shape	keyword
date	keyword
date_nanos	keyword
double	keyword
geo_point	keyword
geo_shape	keyword
integer	keyword
ip	keyword
keyword	keyword
long	keyword
text	keyword
unsigned_long	keyword
version	keyword

Examples

ROW a=10
| EVAL j = TO_STRING(a)

a:integer	j:keyword
10	"10"

It also works fine on multivalued fields:

ROW a=[10, 9, 8]
| EVAL j = TO_STRING(a)

a:integer	j:keyword
[10, 9, 8]	["10", "9", "8"]