cloud-fan commented on code in PR #40885:
URL: https://github.com/apache/spark/pull/40885#discussion_r1176152776
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sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormat.scala:
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@@ -241,47 +260,74 @@ object FileFormat {
FileSourceConstantMetadataStructField(FILE_BLOCK_LENGTH, LongType,
nullable = false),
FileSourceConstantMetadataStructField(FILE_MODIFICATION_TIME,
TimestampType, nullable = false))
+ /**
+ * All [[BASE_METADATA_FIELDS]] require custom extractors because they are
derived directly from
+ * fields of the [[PartitionedFile]], and do have entries in the file's
metadata map.
Review Comment:
@ryan-johnson-databricks do I understand this correctly?
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