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From "Julian Hyde (JIRA)" <>
Subject [jira] [Commented] (PHOENIX-953) Support UNNEST for ARRAY
Date Wed, 12 Aug 2015 20:20:45 GMT


Julian Hyde commented on PHOENIX-953:

I'm skeptical. It's hard to do de-correlation, and even harder if you haven't done semantic
analysis on the sound basis of having implemented LATERAL. Calcite's semantic analyzer and
de-correlation are more advanced than Phoenix's, yet with CALCITE-816 I'm finding and fixing
big holes in Calcite's support for sub-queries and de-correlation.

> Support UNNEST for ARRAY
> ------------------------
>                 Key: PHOENIX-953
>                 URL:
>             Project: Phoenix
>          Issue Type: Sub-task
>            Reporter: James Taylor
>            Assignee: Dumindu Buddhika
>         Attachments: PHOENIX-953-v1.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:
> 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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