object MetadataAttribute
The internal representation of the MetadataAttribute,
it sets metadata_col to true in AttributeReference metadata
- apply() will create a metadata attribute reference
- unapply() will check if an attribute reference is the metadata attribute reference
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- def isPreservedOnDelete(attr: Attribute): Boolean
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- def isValid(metadata: Metadata): Boolean
- def metadata(col: MetadataColumn): Metadata
- def metadata(name: String): Metadata
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(Since version 9)