[jira] [Commented] (ARROW-1574) [C++] Implement kernel function that converts a dense array to dictionary given known dictionary

2020-05-25 Thread Wes McKinney (Jira) 


[ 
https://issues.apache.org/jira/browse/ARROW-1574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17116054#comment-17116054
 ] 

Wes McKinney commented on ARROW-1574:
-

This would be a useful expansion of the functions in vector_hash.cc. We must 
introduce a {{HashOptions}} to be able to supply the known dictionary when 
invoking the functions

> [C++] Implement kernel function that converts a dense array to dictionary 
> given known dictionary
> 
>
> Key: ARROW-1574
> URL: https://issues.apache.org/jira/browse/ARROW-1574
> Project: Apache Arrow
>  Issue Type: New Feature
>  Components: C++
>Reporter: Wes McKinney
>Priority: Major
>  Labels: Analytics
>
> This may simply be a special case of cast using a dictionary type



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[jira] [Commented] (ARROW-1574) [C++] Implement kernel function that converts a dense array to dictionary given known dictionary

2019-06-06 Thread Antoine Pitrou (JIRA) 


[ 
https://issues.apache.org/jira/browse/ARROW-1574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16857796#comment-16857796
 ] 

Antoine Pitrou commented on ARROW-1574:
---

[~fsaintjacques]

> [C++] Implement kernel function that converts a dense array to dictionary 
> given known dictionary
> 
>
> Key: ARROW-1574
> URL: https://issues.apache.org/jira/browse/ARROW-1574
> Project: Apache Arrow
>  Issue Type: New Feature
>  Components: C++
>Reporter: Wes McKinney
>Priority: Major
>  Labels: Analytics
> Fix For: 0.14.0
>
>
> This may simply be a special case of cast using a dictionary type



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[jira] [Commented] (ARROW-1574) [C++] Implement kernel function that converts a dense array to dictionary given known dictionary

2019-02-05 Thread Wes McKinney (JIRA) 


[ 
https://issues.apache.org/jira/browse/ARROW-1574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16761442#comment-16761442
 ] 

Wes McKinney commented on ARROW-1574:
-

Values not found in the dictionary become null

> [C++] Implement kernel function that converts a dense array to dictionary 
> given known dictionary
> 
>
> Key: ARROW-1574
> URL: https://issues.apache.org/jira/browse/ARROW-1574
> Project: Apache Arrow
>  Issue Type: New Feature
>  Components: C++
>Reporter: Wes McKinney
>Priority: Major
>  Labels: Analytics
> Fix For: 0.14.0
>
>
> This may simply be a special case of cast using a dictionary type



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