[jira] [Created] (IMPALA-10920) UNNEST function for arrays in the select list

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

Gabor Kaszab created IMPALA-10920:
-------------------------------------

             Summary: UNNEST function for arrays in the select list
                 Key: IMPALA-10920
                 URL: https://issues.apache.org/jira/browse/IMPALA-10920
             Project: IMPALA
          Issue Type: New Feature
          Components: Backend, Frontend
            Reporter: Gabor Kaszab
            Assignee: Gabor Kaszab


There is a need for implementing an UNNEST(array) function that could be given in the select list so that we can replicate Postgres functionality that has the very same.

Considering the following table:

{code:java}
CREATE TABLE tbl (
  id int,
  arr1 array<int>,
  arr2 array<int>)
STORED AS PARQUET;
{code}
with this data:
{code:java}
1, {1,2}, {11,22,33}
{code}

A sample query would look like this:
{code:java}
SELECT id, UNNEST(arr1), UNNEST(arr2) FROM tbl;
{code}
||id||unnest(arr1)||unnest(arr2)||
|1|1|11|
|1|2|22|
|1|null|33|

Not that the expected is to 'zip' the arrays instead of joining their values to have the same behaviour as Postgres 10+.




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