[jira] [Updated] (SPARK-7727) Avoid inner classes in RuleExecutor

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-7727?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen updated SPARK-7727:
-----------------------------
    Assignee: Stephan Kessler

> Avoid inner classes in RuleExecutor
> -----------------------------------
>
>                 Key: SPARK-7727
>                 URL: https://issues.apache.org/jira/browse/SPARK-7727
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.3.1
>            Reporter: Santiago M. Mola
>            Assignee: Stephan Kessler
>              Labels: easyfix, starter
>             Fix For: 2.0.0
>
>
> In RuleExecutor, the following classes and objects are defined as inner classes or objects: Strategy, Once, FixedPoint, Batch.
> This does not seem to accomplish anything in this case, but makes extensibility harder. For example, if I want to define a new Optimizer that uses all batches from the DefaultOptimizer plus some more, I would do something like:
> {code}
> new Optimizer {
>     override protected val batches: Seq[Batch] =
>       DefaultOptimizer.batches ++ myBatches
>  }
> {code}
> But this will give a typing error because batches in DefaultOptimizer are of type DefaultOptimizer#Batch while myBatches are this#Batch.
> Workarounds include either copying the list of batches from DefaultOptimizer or using a method like this:
> {code}
>     private def transformBatchType(b: DefaultOptimizer.Batch): Batch = {
>       val strategy = b.strategy.maxIterations match {
>         case 1 => Once
>         case n => FixedPoint(n)
>       }
>       Batch(b.name, strategy, b.rules)
>     }
> {code}
> However, making these classes outer would solve the problem.



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