Jan 29, 2026: Apache DataSketches functions (General availability)¶

The following Apache Datasketches functions are now generally available and are no longer in Preview:

Function subcategory	New function	Description
Cardinality estimation	DATASKETCHES_HLL	Returns an approximation of the distinct cardinality of the input (that is, `DATASKETCHES_HLL(col1)` returns an approximation of `COUNT(DISTINCT col1)`).
Cardinality estimation	DATASKETCHES_HLL_ACCUMULATE	Returns the sketch at the end of aggregation.
Cardinality estimation	DATASKETCHES_HLL_COMBINE	Combines (merges) input sketches into a single output sketch.
Cardinality estimation	DATASKETCHES_HLL_ESTIMATE	Returns the cardinality estimate for the given sketch.