[jira] [Reopened] (HUDI-3896) Support Spark optimizations for `HadoopFsRelation`

["Alexey Kudinkin (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HUDI-3896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexey Kudinkin reopened HUDI-3896:
-----------------------------------

> Support Spark optimizations for `HadoopFsRelation`
> --------------------------------------------------
>
>                 Key: HUDI-3896
>                 URL: https://issues.apache.org/jira/browse/HUDI-3896
>             Project: Apache Hudi
>          Issue Type: Bug
>            Reporter: Alexey Kudinkin
>            Assignee: Alexey Kudinkin
>            Priority: Blocker
>             Fix For: 0.12.0
>
>         Attachments: Screen Shot 2022-04-16 at 1.46.50 PM.png
>
>
> After migrating to Hudi's own Relation impls, we unfortunately broke off some of the optimizations that Spark apply exclusively for `HadoopFsRelation`.
>  
> While these optimizations could be perfectly implemented for any `FileRelation`, Spark is unfortunately predicating them on usage of HadoopFsRelation, therefore making them non-applicable to any of the Hudi's relations.
> Proper longterm solutions would be fixing this in Spark and could be either of:
>  # Generalizing such optimizations to any `FileRelation`
>  # Making `HadoopFsRelation` extensible (making it non-case class)
>  
> One example of this is Spark's `SchemaPrunning` optimization rule (HUDI-3891): Spark 3.2.x is able to effectively reduce amount of data read via schema pruning (projecting read data) even for nested structs, however this optimization is predicated on the usage of `HadoopFsRelation`:
> !Screen Shot 2022-04-16 at 1.46.50 PM.png|width=739,height=143!



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