Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19772#discussion_r151732579
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/SQLTransformer.scala ---
@@ -70,7 +70,8 @@ class SQLTransformer @Since("1.6.0") (@Since("1.6.0")
override val uid: String)
dataset.createOrReplaceTempView(tableName)
val realStatement = $(statement).replace(tableIdentifier, tableName)
val result = dataset.sparkSession.sql(realStatement)
- dataset.sparkSession.catalog.dropTempView(tableName)
--- End diff --
It seems like a bug: when you cache a dataframe, create a view from the
dataframe, and drop the view, Spark should not uncache the original dataframe.
We can discuss more later.
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