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Posted to issues-all@impala.apache.org by "Adam Tamas (Jira)" <ji...@apache.org> on 2020/09/02 13:36:00 UTC

[jira] [Created] (IMPALA-10133) Implement ds_hll_stringify()

Adam Tamas created IMPALA-10133:
-----------------------------------

             Summary: Implement ds_hll_stringify()
                 Key: IMPALA-10133
                 URL: https://issues.apache.org/jira/browse/IMPALA-10133
             Project: IMPALA
          Issue Type: Sub-task
            Reporter: Adam Tamas


This function receives a string that is a serialized Apache DataSketches
HLL sketch and returns its stringified format.

A stringified format should look like and contains the following data:
(select ds_hll_stringify(ds_hll_sketch(i)) from t;)
+----------------------------------------------------+
|                        _c0                         |
+----------------------------------------------------+
| ### HLL SKETCH SUMMARY: 
  Log Config K   : 12
  Hll Target     : HLL_4
  Current Mode   : LIST
  Memory         : true
  LB             : 1.0
  Estimate       : 1.0
  UB             : 1.000049929250618
  OutOfOrder Flag: false
  Coupon Count   : 1
 |
+----------------------------------------------------+



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