HLL_EMPTY

Description

HLL_EMPTY returns an empty HLL (HyperLogLog) value, representing a data set with no elements.

Syntax

HLL_EMPTY()

Return Value

Returns an empty HLL type value, representing a data set with no elements.

Example

select hll_cardinality(hll_empty());

+------------------------------+
| hll_cardinality(hll_empty()) |
+------------------------------+
|                            0 |
+------------------------------+