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Version: 2.5

hll_raw_agg

Description

This function is an aggregate function that is used to aggregate HLL fields. It returns an HLL value.

Syntax

hll_raw_agg(hll)

Parameters

hll: the HLL column that is generated by other columns or based on the loaded data.

Return value

Returns a value of the HLL type.

Examples

mysql> select k1, hll_cardinality(hll_raw_agg(v1)) from tbl group by k1;
+------+----------------------------------+
| k1 | hll_cardinality(hll_raw_agg(`v1`)) |
+------+----------------------------------+
| 2 | 4 |
| 1 | 3 |
+------+----------------------------------+