Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# DLOG1 function
<a name="r_DLOG1"></a>

The DLOG1 function returns the natural logarithm of the input parameter. Synonym of [LN function](r_LN.md).