Apache Spark commented on SPARK-17986:

User 'drewrobb' has created a pull request for this issue:

> SQLTransformer leaks temporary tables
> -------------------------------------
>                 Key: SPARK-17986
>                 URL: https://issues.apache.org/jira/browse/SPARK-17986
>             Project: Spark
>          Issue Type: Bug
>          Components: ML
>    Affects Versions: 2.0.1
>            Reporter: Drew Robb
>            Priority: Minor
> The SQLTransformer creates a temporary table when called, and does not delete 
> this temporary table. When using a SQLTransformer in a long running Spark 
> Streaming task, these temporary tables accumulate.
> I believe that the fix would be as simple as calling  
> `dataset.sparkSession.catalog.dropTempView(tableName)` in the last part of 
> `transform`:
> https://github.com/apache/spark/blob/v2.0.1/mllib/src/main/scala/org/apache/spark/ml/feature/SQLTransformer.scala#L65.

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