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https://issues.apache.org/jira/browse/IMPALA-10133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17190441#comment-17190441
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ASF subversion and git services commented on IMPALA-10133:
----------------------------------------------------------
Commit 99e5f5a8859c58641973bc84058eeb15502da96c in impala's branch
refs/heads/master from Adam Tamas
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=99e5f5a ]
IMPALA-10133:Implement ds_hll_stringify function.
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(float_col)) from
functional_parquet.alltypestiny;
+--------------------------------------------+
| ds_hll_stringify(ds_hll_sketch(float_col)) |
+--------------------------------------------+
| ### HLL sketch summary: |
| Log Config K : 12 |
| Hll Target : HLL_4 |
| Current Mode : LIST |
| LB : 2 |
| Estimate : 2 |
| UB : 2.0001 |
| OutOfOrder flag: false |
| Coupon count : 2 |
| ### End HLL sketch summary |
| |
+--------------------------------------------+
Change-Id: I85dbf20b5114dd75c300eef0accabe90eac240a0
Reviewed-on: http://gerrit.cloudera.org:8080/16382
Reviewed-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
> 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
> Assignee: Adam Tamas
> Priority: Major
>
> 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:
> {code:java}
> (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
> |
> +----------------------------------------------------+
> {code}
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