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. |