anton5798 opened a new pull request, #55477:
URL: https://github.com/apache/spark/pull/55477
### What changes were proposed in this pull request?
Wrap `projectionFunc` in `scala.util.Try` when remapping
`pushedFilterExpressions` against the pruned scan output in
`V2ScanRelationPushDown.pruneColumns`, and drop filters whose remap fails. The
accompanying `.subsetOf(AttributeSet(output))` filter is retained for the
top-level-column pruning case.
### Why are the changes needed?
After SPARK-56385, `pushedFilterExpressions` are remapped through
`ProjectionOverSchema` to match the post-pruning scan output. When a pushed
filter references a nested struct field that nested schema pruning has dropped,
`ProjectionOverSchema` calls
`StructType.fieldIndex` on the narrowed struct and throws
`SparkIllegalArgumentException: [FIELD_NOT_FOUND]`.
Repro (exercised by the new test):
```
Schema: s: struct<a: int, b: int>, i: int
Query: SELECT s.b FROM t WHERE s.a > 3 (s.a fully pushed)
```
Column pruning narrows `s` to `struct<b>`. The parent `s` is still in the
output, so the existing `.subsetOf` guard passes, but remapping
`GetStructField(s, "a")` through `ProjectionOverSchema` throws because field
`a` is gone.
This does not crash for top-level pruning — when the pruned column is
entirely absent from the output, `ProjectionOverSchema.getProjection` returns
`None` and `transformDown` leaves the expression unchanged, which `.subsetOf`
then drops cleanly.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Added a unit test in `DataSourceV2Suite` that reproduces the crash via a new
`NestedSchemaDataSourceV2` + `SELECT s.b WHERE s.a > 3` pattern.
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### What changes were proposed in this pull request?
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### Why are the changes needed?
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