brkyvz commented on code in PR #59305:
URL: https://github.com/apache/spark/pull/59305#discussion_r4266611868
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sql/api/src/main/scala/org/apache/spark/sql/types/DataType.scala:
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@@ -344,6 +345,16 @@ object DataType {
TimestampNTZNanosType(p)
}
case "timestamp_ltz" => TimestampType
+ case FILE_TYPE(mode) =>
+ // Bare `"file"` resolves differently depending on context: inside a
StructField it is
+ // an external file, which is also what a schema written without any
metadata means; in a
+ // standalone parse (top-level `fromJson` or recursion outside any
StructField) it has no
+ // mode yet, as when a UDF's return type is serialized as a bare
`"file"`.
Review Comment:
this feels a bit awkward. What if a UDF returns a nested type with a File in
it? Don't we want to think that it is FILE unknown?
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