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https://issues.apache.org/jira/browse/SPARK-4791?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust resolved SPARK-4791.
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Resolution: Fixed
Assignee: Joseph K. Bradley
> Create SchemaRDD from case classes with multiple constructors
> -------------------------------------------------------------
>
> Key: SPARK-4791
> URL: https://issues.apache.org/jira/browse/SPARK-4791
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.3.0
> Reporter: Joseph K. Bradley
> Assignee: Joseph K. Bradley
> Priority: Minor
>
> Issue: One can usually take an RDD of case classes and create a SchemaRDD,
> where Spark SQL infers the schema from the case class metadata. However, if
> the case class has multiple constructors, then ScalaReflection.schemaFor gets
> confused.
> Motivation: In spark.ml, I would like to create a class with the following
> signature:
> ```
> case class LabeledPoint(label: Double, features: Vector, weight: Double) {
> def this(label: Double, features: Vector) = this(label, features, 1.0)
> }
> ```
> Proposed fix: Change ScalaReflection.schemaFor so it checks for whether there
> are multiple constructors. If there are multiple ones, it should take the
> primary constructor. This will not change the behavior of existing code
> since it currently only supports case classes with 1 constructor.
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