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https://issues.apache.org/jira/browse/PHOENIX-953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14717765#comment-14717765
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Maryann Xue commented on PHOENIX-953:
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Not sure, but guess neither would be too difficult and WITH ORDINALITY should
be a little easier to support. But definitely the ability to UNNEST more than
one array would be beneficial to such use cases and make queries run more
efficiently.
[~julianhyde] Where can I find the spec? Looks like there's no free resource,
right?
BTW, I saw that Hsqldb actually supports UNNEST with one array argument and
with ordinality.
> Support UNNEST for ARRAY
> ------------------------
>
> Key: PHOENIX-953
> URL: https://issues.apache.org/jira/browse/PHOENIX-953
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: James Taylor
> Assignee: Dumindu Buddhika
> Fix For: 4.6
>
> Attachments: PHOENIX-953-v1.patch, PHOENIX-953-v2.patch,
> PHOENIX-953-v3.patch, PHOENIX-953-v4.patch
>
>
> The UNNEST built-in function converts an array into a set of rows. This is
> more than a built-in function, so should be considered an advanced project.
> For an example, see the following Postgres documentation:
> http://www.postgresql.org/docs/8.4/static/functions-array.html
> http://www.anicehumble.com/2011/07/postgresql-unnest-function-do-many.html
> http://tech.valgog.com/2010/05/merging-and-manipulating-arrays-in.html
> So the UNNEST is a way of converting an array to a flattened "table" which
> can then be filtered on, ordered, grouped, etc.
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