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

Co-authored-by: Liam Thompson <32779855+leemthompo@users.noreply.github.com>
Co-authored-by: Liam Thompson <leemthompo@gmail.com>
Co-authored-by: Martijn Laarman <Mpdreamz@gmail.com>
Co-authored-by: István Zoltán Szabó <szabosteve@gmail.com>
2025-02-27 17:56:14 +01:00

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LOG [esql-log]

Syntax

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

Parameters

base
Base of logarithm. If null, the function returns null. If not provided, this function returns the natural logarithm (base e) of a value.
number
Numeric expression. If null, the function returns null.

Description

Returns the logarithm of a value to a base. The input can be any numeric value, the return value is always a double. Logs of zero, negative numbers, and base of one return null as well as a warning.

Supported types

base number result
double double double
double integer double
double long double
double unsigned_long double
double double
integer double double
integer integer double
integer long double
integer unsigned_long double
integer double
long double double
long integer double
long long double
long unsigned_long double
long double
unsigned_long double double
unsigned_long integer double
unsigned_long long double
unsigned_long unsigned_long double
unsigned_long double

Examples

ROW base = 2.0, value = 8.0
| EVAL s = LOG(base, value)
base: double value: double s:double
2.0 8.0 3.0 
row value = 100
| EVAL s = LOG(value);
value: integer s:double
100 4.605170185988092