Packages

object SelectedField

A Scala extractor that builds a org.apache.spark.sql.types.StructField from a Catalyst complex type extractor. For example, consider a relation with the following schema:

root
|-- name: struct (nullable = true)
|    |-- first: string (nullable = true)
|    |-- last: string (nullable = true)

Further, suppose we take the select expression name.first. This will parse into an Alias(child, "first"). Ignoring the alias, child matches the following pattern:

GetStructFieldObject(
  AttributeReference("name", StructType(_), _, _),
  StructField("first", StringType, _, _))

SelectedField converts that expression into

StructField("name", StructType(Array(StructField("first", StringType))))

by mapping each complex type extractor to a org.apache.spark.sql.types.StructField with the same name as its child (or "parent" going right to left in the select expression) and a data type appropriate to the complex type extractor. In our example, the name of the child expression is "name" and its data type is a org.apache.spark.sql.types.StructType with a single string field named "first".

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