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https://issues.apache.org/jira/browse/IMPALA-10132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17189257#comment-17189257
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Adam Tamas commented on IMPALA-10132:
-------------------------------------
Impala is not able to give back complex types as of now.
We can either wait until it gets implemented or give back the estimations as a
string with the values separated with commas.
> Implement ds_hll_estimate_bounds()
> ----------------------------------
>
> Key: IMPALA-10132
> URL: https://issues.apache.org/jira/browse/IMPALA-10132
> Project: IMPALA
> Issue Type: Sub-task
> Reporter: Adam Tamas
> Priority: Major
>
> In hive ds_hll_estimate_bounds() gives back an array of doubles.
> An example for a sketch created from a table which contains only a single
> value:
> {code:java}
> (select ds_hll_estimate_bounds(ds_hll_sketch(i)) from t;)
> +-------------------------------+
> | _c0 |
> +-------------------------------+
> | [1.0,1.0,1.0000998634873453] |
> +-------------------------------+
> {code}
> The values of the array is probably a lower bound, an estimate and an upper
> bound of the sketch.
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