HyukjinKwon commented on code in PR #40677:
URL: https://github.com/apache/spark/pull/40677#discussion_r1161398315
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala:
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@@ -554,6 +554,28 @@ object FileSourceMetadataAttribute {
metadata.getBoolean(FILE_SOURCE_METADATA_COL_ATTR_KEY)
}
+ /**
+ * True if the given data type is supported in file source metadata
attributes.
+ *
+ * Strings are spark [[UTFString]], but implementations can also provide
scala [[String]] and it
+ * will be converted automatically as needed.
+ *
+ * Currently, only a handful of atomic (primitive) types are supported.
+ */
+ def isSupportedType(dataType: DataType): Boolean = dataType match {
+ case _: LongType | _: IntegerType | _: ShortType | _: ByteType => true
+ case _: DoubleType | _: FloatType => true
+ case _: StringType => true
+ case _: TimestampType => true // really just Long
Review Comment:
Should we also add `DateType` (int), `DayTimeIntervalType` (long) and
`YearMonthIntervalType` (int)`?
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