Adam Tamas
4cb3c3556e
IMPALA-10108: Implement ds_kll_stringify function
This function receives a string that is a serialized Apache DataSketches
KLL sketch and returns its stringified format.
A stringified format should look like and contains the following data:
select ds_kll_stringify(ds_kll_sketch(float_col))
from functional_parquet.alltypestiny;
+--------------------------------------------+
| ds_kll_stringify(ds_kll_sketch(float_col)) |
+--------------------------------------------+
| ### KLL sketch summary: |
| K : 200 |
| min K : 200 |
| M : 8 |
| N : 8 |
| Epsilon : 1.33% |
| Epsilon PMF : 1.65% |
| Empty : false |
| Estimation mode: false |
| Levels : 1 |
| Sorted : false |
| Capacity items : 200 |
| Retained items : 8 |
| Storage bytes : 64 |
| Min value : 0 |
| Max value : 1.1 |
| ### End sketch summary |
| |
+--------------------------------------------+
Change-Id: I97f654a4838bf91e3e0bed6a00d78b2c7aa96f75
Reviewed-on: http://gerrit.cloudera.org:8080/16370
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
2020-09-02 10:49:10 +00:00
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