[jira] [Created] (IMPALA-10105) Rewrite KLL functions to return array of doubles

["Gabor Kaszab (Jira)" <ji...@apache.org>]

Gabor Kaszab created IMPALA-10105:
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             Summary: Rewrite KLL functions to return array of doubles
                 Key: IMPALA-10105
                 URL: https://issues.apache.org/jira/browse/IMPALA-10105
             Project: IMPALA
          Issue Type: New Feature
          Components: Backend
            Reporter: Gabor Kaszab


There are functions that originally meant to return Array<Double> but since Impala doesn't have support for returning complex types these functions were implemented to return a comma separated string.

To avoid breaking compatibility these functions got "_as_string" postfix:
- ds_kll_quantiles_as_string()
- ds_kll_pmf_as_string()
- ds_kll_cdf_as_string()

This ticket is to implement the version of these functions that actually return an array of doubles.
- ds_kll_quantiles()
- ds_kll_pmf()
- ds_kll_cdf()

This is the Jira that track complex types support as return type:
https://issues.apache.org/jira/browse/IMPALA-9520



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