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https://issues.apache.org/jira/browse/SPARK-17986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15584466#comment-15584466
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Apache Spark commented on SPARK-17986:
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User 'drewrobb' has created a pull request for this issue:
https://github.com/apache/spark/pull/15526
> 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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