Amazon Redshift will no longer support the use of Python UDFs after June 30, 2026. We will start enforcing it in phases. For more information on the details of Python end of life and migration options, 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/) that was published on June 30, 2025. 

# HyperLogLog functions
<a name="hyperloglog-functions"></a>

Following, you can find descriptions for the HyperLogLog functions for SQL that Amazon Redshift supports.

**Topics**
+ [HLL function](r_HLL_function.md)
+ [HLL\_CREATE\_SKETCH function](r_HLL_CREATE_SKETCH.md)
+ [HLL\_CARDINALITY function](r_HLL_CARDINALITY.md)
+ [HLL\_COMBINE function](r_HLL_COMBINE.md)
+ [HLL\_COMBINE\_SKETCHES function](r_HLL_COMBINE_SKETCHES.md)