[jira] [Assigned] (ARROW-17648) [C++] Add ScanOptions to support projection and filter in ToProto Read

["Apache Arrow JIRA Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-17648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Arrow JIRA Bot reassigned ARROW-17648:
---------------------------------------------

    Assignee:     (was: Vibhatha Lakmal Abeykoon)

> [C++] Add ScanOptions to support projection and filter in ToProto Read
> ----------------------------------------------------------------------
>
>                 Key: ARROW-17648
>                 URL: https://issues.apache.org/jira/browse/ARROW-17648
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Vibhatha Lakmal Abeykoon
>            Priority: Major
>              Labels: query-engine, substrait, substrait-roundtrip
>
> When converting from an Acero plan to a Substrait plan not all scan options are fully supported.  The `projection` (partial column selection) and `filter` (pushdown filtering) support needs to be added.
> Ref:
>  
> {code:java}
> Result<std::unique_ptr<substrait::ReadRel>> ScanRelationConverter(const std::shared_ptr<Schema>& schema, const compute::Declaration& declaration,    ExtensionSet* ext_set, const ConversionOptions& conversion_options) {  
> auto read_rel = make_unique<substrait::ReadRel>();
> const auto& scan_node_options = checked_cast<const dataset::ScanNodeOptions&>(*declaration.options);  
> auto dataset = dynamic_cast<dataset::FileSystemDataset*>(scan_node_options.dataset.get()); 
> // TODO handle here{code}
>  
>  



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