Gabor Kaszab created IMPALA-9963:
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Summary: Implement ds_kll_n() function
Key: IMPALA-9963
URL: https://issues.apache.org/jira/browse/IMPALA-9963
Project: IMPALA
Issue Type: Improvement
Components: Backend
Reporter: Gabor Kaszab
ds_kll_n() receives a serialized Apache DataSketches KLL sketch and returns how
many values were fed into the sketch.
Returns a bigint.
Example:
{code:java}
select ds_kll_n(ds_kll_sketch(cast(int_col as float))) from table_name;
+------+
| _c0 |
+------+
| 6 |
+------+
{code}
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