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

TO_LOWER [esql-to_lower]

Syntax

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

Parameters

str

String expression. If null, the function returns null.

Description

Returns a new string representing the input string converted to lower case.

Supported types

str	result
keyword	keyword
text	keyword

Example

ROW message = "Some Text"
| EVAL message_lower = TO_LOWER(message)

message:keyword	message_lower:keyword
Some Text	some text