Help Center/ Data Lake Insight/ Spark SQL Syntax Reference/ Built-In Functions/ Mathematical Functions/ log2
Updated on 2023-10-25 GMT+08:00
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log2

This function is used to return the natural logarithm of a given value with a base of 2.

Syntax

log2(DOUBLE a)

Parameters

Table 1 Parameter

Parameter

Mandatory

Type

Description

a

Yes

DOUBLE, BIGINT, DECIMAL, or STRING

The value can be a float, integer, or string.

If the value is not of the DOUBLE type, the system will implicitly convert it to the DOUBLE type for calculation.

Return Values

The return value is of the DOUBLE type.

If the value of a is negative, 0, or NULL, NULL is returned.

Example Code

The value NULL is returned.

select log2(null);

The value NULL is returned.

select log2(0);

The value 3.1699250014423126 is returned.

select log2(9);

The value 4 is returned.

select log2(16);
Parent topic: Mathematical Functions