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VeloDB Cloud 26.x·Apache Doris 4.x (up to 4.0 supported)·"Since X.Y" tags refer to Apache Doris versionsVersion mapping

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 |
+------------------------------+