[jira] [Work logged] (BEAM-5884) Allow nested types have null value.

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-5884?focusedWorklogId=162712&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-162712 ]

ASF GitHub Bot logged work on BEAM-5884:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 05/Nov/18 19:27
            Start Date: 05/Nov/18 19:27
    Worklog Time Spent: 10m 
      Work Description: kanterov edited a comment on issue #6861: [BEAM-5884] support null values in Array and Map.
URL: https://github.com/apache/beam/pull/6861#issuecomment-436003580
 
 
   >  We should do this regardless, but I'm curious what the SQL standard and other engines support.
   
   @kennknowles Out of my head, limitations in Spark SQL, it doesn't support types like:
   `Map<Optional<?>, ?>`
   `Record(field: Optional<Record(field: Optional<?>)>)`
   
   As I remember, the reason for records is they are stored in the flattened form, that requires expressing `Optional<Optional<?>>` that doesn't work because a boolean flag is used.

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 162712)
    Time Spent: 3.5h  (was: 3h 20m)

> Allow nested types have null value.
> -----------------------------------
>
>                 Key: BEAM-5884
>                 URL: https://issues.apache.org/jira/browse/BEAM-5884
>             Project: Beam
>          Issue Type: Bug
>          Components: dsl-sql
>            Reporter: Rui Wang
>            Assignee: Rui Wang
>            Priority: Major
>          Time Spent: 3.5h
>  Remaining Estimate: 0h
>
> We could allow arbitrary combination of nested types have null value.



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