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https://issues.apache.org/jira/browse/BEAM-3647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361303#comment-16361303
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Kenneth Knowles commented on BEAM-3647:
---------------------------------------

I may not understand the request here. It sounds like you want PCollection 
schemas associated with non-Row objects. That is currently under discussion.

But on the other hand, templates with ValueProvider will not work with SQL 
because a SQL statement has a customized expansion, and a template has a fixed 
expansion currently.

> Default Coder/Reading Coder From File 
> --------------------------------------
>
>                 Key: BEAM-3647
>                 URL: https://issues.apache.org/jira/browse/BEAM-3647
>             Project: Beam
>          Issue Type: New Feature
>          Components: beam-model, dsl-sql
>    Affects Versions: 2.2.0
>            Reporter: Kishan Kumar
>            Assignee: Anton Kedin
>            Priority: Critical
>
> *Requirement*-: Need to Run Template With Same Logics on Different Tables 
> Data.(Example is Given Below)
>  
> *Need*: Default Coder is Required So According to Data It Make All Fields as 
> String and Read Data else Thier must be Dynamic Options to Read Coder From 
> GCS as JSON FILE and Parse Data on Basis of That (But We can Pass Location 
> Using ValueProvider) or SomeWhere Else so At Runtime Using ValueProvider.
>  
>  
> *Examples*: I Have Two Tables 1 is Having Column (NAME, CLASS, ROLL, 
> SUB_PRICE)
> And 2 Table is (NAME, ROLL, SUB, TEST_MARKS)
>  
> On Both Tables, I am Just Sorting Table on Basis Of Roll Number so if We can 
> Read Coder at Run Time The Same Template Can Be Used For Different Tables at 
> Run Time.
>  
> Such Situations Make Our Work Easy and Make Our job Easy.
>  



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