Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/16370 )

Change subject: IMPALA-10108: Implement ds_kll_stringify function
......................................................................

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 <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
---
M be/src/exprs/datasketches-functions-ir.cc
M be/src/exprs/datasketches-functions.h
M common/function-registry/impala_functions.py
M testdata/workloads/functional-query/queries/QueryTest/datasketches-kll.test
4 files changed, 59 insertions(+), 1 deletion(-)

Approvals:
  Impala Public Jenkins: Looks good to me, approved; Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I97f654a4838bf91e3e0bed6a00d78b2c7aa96f75
Gerrit-Change-Number: 16370
Gerrit-PatchSet: 9
Gerrit-Owner: Adam Tamas <[email protected]>
Gerrit-Reviewer: Adam Tamas <[email protected]>
Gerrit-Reviewer: Gabor Kaszab <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>

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