Takes one or more HLL++ sketch inputs and merges them into a new sketch.
Each sketch must be built on the same type and the same precision. Attempts to merge sketches for different types or precision results in an error. For example, you cannot merge a sketch built from
INTEGER data with one built from
TEXT data, or a sketch built with 13 precision and a sketch built with 14 precision.
If the input expression is NULL or empty, this function returns NULL.
HLL_COUNT_MERGE_PARTIAL ( <expression> )
|Parameter||Description||Supported input types|
| ||HLL++ sketch in a valid format, e.g. the output of the || |
SELECT HLL_COUNT_MERGE_PARTIAL(hll_sketch) as merged_sketches FROM sketch_table;
A merged HLL++ sketch represented in data type