[jira] [Created] (SPARK-41861) Make v2 ScanBuilders' build() return typed scan

["Lorenzo Martini (Jira)" <ji...@apache.org>]

Lorenzo Martini created SPARK-41861:
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             Summary: 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


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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