[jira] [Updated] (ARROW-3978) [C++] Implement hashing, dictionary-encoding for StructArray

2020-05-25 Thread Wes McKinney (Jira) 


 [ 
https://issues.apache.org/jira/browse/ARROW-3978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Wes McKinney updated ARROW-3978:

Labels: query-engine  (was: )

> [C++] Implement hashing, dictionary-encoding for StructArray
> 
>
> Key: ARROW-3978
> URL: https://issues.apache.org/jira/browse/ARROW-3978
> Project: Apache Arrow
>  Issue Type: New Feature
>  Components: C++
>Reporter: Wes McKinney
>Priority: Major
>  Labels: query-engine
>
> This is a central requirement for hash-aggregations such as
> {code}
> SELECT AGG_FUNCTION(expr)
> FROM table
> GROUP BY expr1, expr2, ...
> {code}
> The materialized keys in the GROUP BY section form a struct, which can be 
> incrementally hashed to produce dictionary codes suitable for computing 
> aggregates or any other purpose. 
> There are a few subtasks related to this, such as efficiently constructing a 
> record (that can be hashed quickly) to identify each "row" in the struct. 
> Maybe we should start with that first



--
This message was sent by Atlassian Jira
(v8.3.4#803005)

[jira] [Updated] (ARROW-3978) [C++] Implement hashing, dictionary-encoding for StructArray

2019-06-11 Thread Wes McKinney (JIRA) 


 [ 
https://issues.apache.org/jira/browse/ARROW-3978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Wes McKinney updated ARROW-3978:

Fix Version/s: (was: 0.14.0)
   0.15.0

> [C++] Implement hashing, dictionary-encoding for StructArray
> 
>
> Key: ARROW-3978
> URL: https://issues.apache.org/jira/browse/ARROW-3978
> Project: Apache Arrow
>  Issue Type: New Feature
>  Components: C++
>Reporter: Wes McKinney
>Priority: Major
> Fix For: 0.15.0
>
>
> This is a central requirement for hash-aggregations such as
> {code}
> SELECT AGG_FUNCTION(expr)
> FROM table
> GROUP BY expr1, expr2, ...
> {code}
> The materialized keys in the GROUP BY section form a struct, which can be 
> incrementally hashed to produce dictionary codes suitable for computing 
> aggregates or any other purpose. 
> There are a few subtasks related to this, such as efficiently constructing a 
> record (that can be hashed quickly) to identify each "row" in the struct. 
> Maybe we should start with that first



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

[jira] [Updated] (ARROW-3978) [C++] Implement hashing, dictionary-encoding for StructArray

2019-02-07 Thread Wes McKinney (JIRA) 


 [ 
https://issues.apache.org/jira/browse/ARROW-3978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Wes McKinney updated ARROW-3978:

Fix Version/s: (was: 0.13.0)
   0.14.0

> [C++] Implement hashing, dictionary-encoding for StructArray
> 
>
> Key: ARROW-3978
> URL: https://issues.apache.org/jira/browse/ARROW-3978
> Project: Apache Arrow
>  Issue Type: New Feature
>  Components: C++
>Reporter: Wes McKinney
>Priority: Major
> Fix For: 0.14.0
>
>
> This is a central requirement for hash-aggregations such as
> {code}
> SELECT AGG_FUNCTION(expr)
> FROM table
> GROUP BY expr1, expr2, ...
> {code}
> The materialized keys in the GROUP BY section form a struct, which can be 
> incrementally hashed to produce dictionary codes suitable for computing 
> aggregates or any other purpose. 
> There are a few subtasks related to this, such as efficiently constructing a 
> record (that can be hashed quickly) to identify each "row" in the struct. 
> Maybe we should start with that first



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)