object FileSourceConstantMetadataAttribute
The internal representation of the FileSourceConstantMetadataAttribute, it sets metadata_col to
and file_source_constant_metadata_coltrue in AttributeReference's metadata. This type
is used to represent metadata that is constant for a whole file, like file name. Values are
usually appended to the output and not generated per row.
- apply() will create a file source metadata attribute reference - unapply() will check if an attribute reference is the file source metadata attribute reference
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- val FILE_SOURCE_CONSTANT_METADATA_COL_ATTR_KEY: String
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