ScalaReflection

ScalaReflection is the contract and the only implementation of the contract with…FIXME

`serializerFor` Object Method

serializerFor[T : TypeTag](inputObject: Expression): CreateNamedStruct

serializerFor firstly finds the local type of the input type T and then the class name.

serializerFor uses the internal version of itself with the input inputObject expression, the tpe type and the walkedTypePath with the class name found earlier (of the input type T).

- root class: "[clsName]"

In the end, serializerFor returns one of the following:

The CreateNamedStruct expression from the false value of the If expression returned only if the type T is definedByConstructorParams
Creates a CreateNamedStruct expression with the Literal with the value as "value" and the expression returned

import org.apache.spark.sql.functions.lit
val inputObject = lit(1).expr

import org.apache.spark.sql.catalyst.ScalaReflection
val serializer = ScalaReflection.serializerFor(inputObject)
scala> println(serializer)
named_struct(value, 1)

Note	`serializerFor` is used when…FIXME

`serializerFor` Internal Method

serializerFor(
  inputObject: Expression,
  tpe: `Type`,
  walkedTypePath: Seq[String],
  seenTypeSet: Set[`Type`] = Set.empty): Expression

serializerFor…FIXME

Note	`serializerFor` is used exclusively when `ScalaReflection` is requested to serializerFor.

`localTypeOf` Object Method

localTypeOf[T: TypeTag]: `Type`

localTypeOf…FIXME

import org.apache.spark.sql.catalyst.ScalaReflection
val tpe = ScalaReflection.localTypeOf[Int]
scala> :type tpe
org.apache.spark.sql.catalyst.ScalaReflection.universe.Type

scala> println(tpe)
Int

Note	`localTypeOf` is used when…FIXME

`getClassNameFromType` Object Method

getClassNameFromType(tpe: `Type`): String

getClassNameFromType…FIXME

import org.apache.spark.sql.catalyst.ScalaReflection
val tpe = ScalaReflection.localTypeOf[java.time.LocalDateTime]
val className = ScalaReflection.getClassNameFromType(tpe)
scala> println(className)
java.time.LocalDateTime

Note	`getClassNameFromType` is used when…FIXME

`definedByConstructorParams` Object Method

definedByConstructorParams(tpe: Type): Boolean

definedByConstructorParams…FIXME

Note	`definedByConstructorParams` is used when…FIXME

ScalaReflection