object FileSourceGeneratedMetadataAttribute
The internal representation of the FileSourceGeneratedMetadataAttribute. It sets metadata_col to
and file_source_generated_metadata_coltrue in AttributeReference's metadata. In
contrast to FileSourceConstantMetadataAttribute it represents metadata columns that are not
constant per file and are generated as part of the scan.
- apply() will create a file source generated metadata attribute reference - unapply() will check if an attribute reference is the file source generated metadata attribute reference
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- val FILE_SOURCE_GENERATED_METADATA_COL_ATTR_KEY: String
- def apply(name: String, dataType: DataType, nullable: Boolean = false): AttributeReference
We keep generated metadata attributes nullability configurable here: 1.
We keep generated metadata attributes nullability configurable here: 1. Before passing to readers, we create generated metadata attributes as nullable; Because, for row_index, the readers do not consider the column required. row_index can be generated with null in the process by readers. 2. When applying the projection, we change the nullability back to not-nullable; For row_index, it is generated with nulls which are then replaced, so it will not be null in the returned output. See
FileSourceStrategyfor more information - final def asInstanceOf[T0]: T0
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- def isGeneratedMetadataColumn(structField: StructField): Boolean
True if
structFieldrepresents a file source generated metadata column. - final def isInstanceOf[T0]: Boolean
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