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From "Wes McKinney (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (ARROW-94) Expand list example to clarify null vs empty list
Date Sun, 03 Apr 2016 23:05:25 GMT

    [ https://issues.apache.org/jira/browse/ARROW-94?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223544#comment-15223544
] 

Wes McKinney edited comment on ARROW-94 at 4/3/16 11:05 PM:
------------------------------------------------------------

There are OmniGraffle files I can send you. I'm thinking it might be better to transition
to plain text "illustrations", i.e. 

{code}
data ["foo", "", null, null, "bar2"]

List
----
bitmap   00010011
length: 5
null_count: 2
offsets: 0  3  3  3  3  7
children:
  - uint8 (char)
    -----
    length: 7
    null_count: 0
    values: f o o b a r 2
{code}


was (Author: wesmckinn):
There are OmniGraffle files I can send you. I'm thinking it might be better to transition
to plain text "illustrations", i.e. 

{code}
data ["foo", "", null, null, "bar2"]

List
----
bitmap   00010011
length: 5
null_count: 2
offsets: 0  3  3  3  3  7
children:
  - Int32
    -----
    length: 7
    null_count: 0
    values: f o o b a r 2
{code}

> Expand list example to clarify null vs empty list
> -------------------------------------------------
>
>                 Key: ARROW-94
>                 URL: https://issues.apache.org/jira/browse/ARROW-94
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Format
>            Reporter: Micah Kornfield
>            Assignee: Micah Kornfield
>
> The current spec seems to make the possibility of an empty list impossible (or at least
conflates it with null).  



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