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https://issues.apache.org/jira/browse/IMPALA-9520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17185347#comment-17185347
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ASF subversion and git services commented on IMPALA-9520:
---------------------------------------------------------
Commit a8a35edbc407e02187279ac8d090a345d026c57a in impala's branch
refs/heads/master from Gabor Kaszab
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=a8a35ed ]
IMPALA-10019: Implement ds_kll_pmf_as_string() function
This is the support for Probabilistic Mass Function (PMF) from Apache
DataSketches KLL algorithm collection. It receives a serialized KLL
sketch and one or more float values to represent ranges in the
sketched values.
E.g. [1, 5, 10] will mean the following ranges:
(-inf, 1), [1, 5), [5, 10), [10, +inf)
Returns a comma separated string where each value in the string is a
number in the range of [0,1] and shows that what percentage of the
data is in the particular ranges.
Note, ds_kll_pmf() should return an Array of doubles as the result but
with that we have to wait for the complex type support. Until, we
provide ds_kll_pmf_as_string() that can be deprecated once we
have array support. Tracking Jira for returning complex types from
functions is IMPALA-9520.
Example:
select ds_kll_pmf_as_string(ds_kll_sketch(float_col), 2, 4, 10)
from alltypes;
+----------------------------------------------------------+
| ds_kll_pmf_as_string(ds_kll_sketch(float_col), 2, 4, 10) |
+----------------------------------------------------------+
| 0.202192,0.199452,0.598356,0 |
+----------------------------------------------------------+
Change-Id: I222402f2dce2f49ab2b3f6e81a709da5539293ba
Reviewed-on: http://gerrit.cloudera.org:8080/16336
Reviewed-by: Gabor Kaszab <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> Allow returning complex types from UDFs
> ---------------------------------------
>
> Key: IMPALA-9520
> URL: https://issues.apache.org/jira/browse/IMPALA-9520
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend, Frontend
> Reporter: Gabor Kaszab
> Priority: Major
> Labels: complextype
>
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