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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