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https://issues.apache.org/jira/browse/SPARK-41861?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-41861.
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Fix Version/s: 3.4.0
Resolution: Fixed
Issue resolved by pull request 39367
[https://github.com/apache/spark/pull/39367]
> Make v2 ScanBuilders' build() return typed scan
> -----------------------------------------------
>
> Key: SPARK-41861
> URL: https://issues.apache.org/jira/browse/SPARK-41861
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.3.1
> Reporter: Lorenzo Martini
> Assignee: Lorenzo Martini
> Priority: Trivial
> Fix For: 3.4.0
>
>
> The `ScanBuilder` interface has the `build()` method to return `Scan`
> objects. All the different implementations of it return scans that are of the
> type of the builder itself. Eg `ParquetScanBuilder` will return a
> `ParquetScan`, `TextScanBuilder` a `TextScan` etc. However, in the method
> overrides declaration, the return type is not changed to the more specific
> type but left as a generic `Scan`. This is a bit problematic when one has to
> work with scan object because a manual cast is required, even if we know for
> a fact that a `ParquetScanBuilder`'s `build()` method will return a
> `ParquetScan`. For ease of developement (and for stricter correctness checks,
> as we wouldn't want a `ParquetScanBuilder` to return a non-parquet scan I
> would assume), it would be very nice if the `build()` methods of each
> implementation of `ScanBuilder`s returned a more strictly typed object
> instead of the generic `Scan` object
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