object FileSourceConstantMetadataStructField
A StructField that describes a file source constant metadata struct field -- a member of the
_metadata struct whose value is constant for a whole file (e.g. file name). Values are usually
appended to the output and not generated per row.
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- val FILE_SOURCE_CONSTANT_METADATA_COL_ATTR_KEY: String
- def apply(name: String, dataType: DataType, nullable: Boolean = true): StructField
Constructs a new metadata struct field of the given type; nullable by default
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- def isValid(dataType: DataType, metadata: Metadata): Boolean
- def metadata(name: String): Metadata
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