MetadataColumn¶

MetadataColumn is an abstraction of metadata columns that can expose additional metadata about a row.

Contract¶

comment¶

String comment()

Documentation of this metadata column

Default: null

dataType¶

DataType dataType()

isNullable¶

boolean isNullable()

Default: true

Name¶

String name()

Used when:

• MetadataColumnsHelper implicit class is requested to asStruct
• DataSourceV2Relation is requested for the metadata columns
• DescribeTableExec is requested to addMetadataColumns

transform¶

Transform transform()

Transform to produce values for this metadata column from data rows

Default: null

MetadataColumnsHelper¶

MetadataColumns can be converted (implicitly) to StructTypes or AttributeReferences using MetadataColumnsHelper implicit class.