object FileSourceGeneratedMetadataStructField
A StructField that describes a file source generated metadata struct field -- a member of the
metadata struct that maps to some internal column the scanner returns.
- apply() wil create a file source generated metadata struct field - unapply() matches a file source generated metadata struct field, and returns its internal name
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- val FILE_SOURCE_GENERATED_METADATA_COL_ATTR_KEY: String
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We keep generated metadata attributes nullability configurable here: 1.
We keep generated metadata attributes nullability configurable here: 1. Before passing to readers, we create generated metadata attributes as nullable; Because, for row_index, the readers do not consider the column required. row_index can be generated with null in the process by readers. 2. When applying the projection, we restore the nullability specified here; For row_index, it is generated with nulls which are then replaced, so it will not be null in the returned output. See
FileSourceStrategyfor more information -
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- def getInternalNameIfValid(dataType: DataType, metadata: Metadata): Option[String]
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- def isValid(dataType: DataType, metadata: Metadata): Boolean
- def metadata(name: String, internalName: String): Metadata
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