DeltaColumnMappingMode¶
DeltaColumnMappingMode is an abstraction of the available column mapping modes in Column Mapping.
Contract¶
Name¶
name: String
Human-friendly name of this DeltaColumnMappingMode used in error reporting
Used when:
DeltaErrorsutility is used to create a DeltaColumnMappingUnsupportedException and aColumnMappingException(for missingColumnId, missingPhysicalName, duplicatedColumnId, duplicatedPhysicalName)DeltaColumnMappingBaseis requested to verifyAndUpdateMetadataChange, getColumnMappingMetadata and createPhysicalSchema
Implementations¶
Sealed Trait
DeltaColumnMappingMode is a Scala sealed trait which means that all of the implementations are in the same compilation unit (a single file).
Learn more in the Scala Language Specification.
IdMapping¶
This mode uses the column ID as the identifier of a column.
Name: id
Used for tables converted from Apache Iceberg.
This mode does require a new protocol
NameMapping¶
Name: name
This mode does require a new protocol
NoMapping¶
No column mapping and the display name of a column is the only valid identifier to read and write data.
Name: none
This mode does not require a new protocol