case class ProjectionOverSchema(schema: StructType, output: AttributeSet) extends Product with Serializable
A Scala extractor that projects an expression over a given schema. Data types, field indexes and field counts of complex type extractors and attributes are adjusted to fit the schema. All other expressions are left as-is. This class is motivated by columnar nested schema pruning.
- schema
nested column schema
- output
output attributes of the data source relation. They are used to filter out attributes in the schema that do not belong to the current relation.
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ProjectionOverSchema(schema: StructType, output: AttributeSet)
- schema
nested column schema
- output
output attributes of the data source relation. They are used to filter out attributes in the schema that do not belong to the current relation.
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- val output: AttributeSet
- val schema: StructType
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