spark git commit: [SPARK-17986][ML] SQLTransformer should remove temporary tables

[yl...@apache.org]

Repository: spark
Updated Branches:
  refs/heads/master 01b26a064 -> ab3363e9f


[SPARK-17986][ML] SQLTransformer should remove temporary tables

## What changes were proposed in this pull request?

A call to the method `SQLTransformer.transform` previously would create a temporary table and never delete it. This change adds a call to `dropTempView()` that deletes this temporary table before returning the result so that the table will not remain in spark's table catalog. Because `tableName` is randomized and not exposed, there should be no expected use of this table outside of the `transform` method.

## How was this patch tested?

A single new assertion was added to the existing test of the `SQLTransformer.transform` method that all temporary tables are removed. Without the corresponding code change, this new assertion fails. I am not aware of any circumstances in which removing this temporary view would be bad for performance or correctness in other ways, but some expertise here would be helpful.

Author: Drew Robb <dr...@gmail.com>

Closes #15526 from drewrobb/SPARK-17986.


Project: http://git-wip-us.apache.org/repos/asf/spark/repo
Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/ab3363e9
Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/ab3363e9
Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/ab3363e9

Branch: refs/heads/master
Commit: ab3363e9f6b1f7fc26682509fe7382c570f91778
Parents: 01b26a0
Author: Drew Robb <dr...@gmail.com>
Authored: Sat Oct 22 01:59:36 2016 -0700
Committer: Yanbo Liang <yb...@gmail.com>
Committed: Sat Oct 22 01:59:36 2016 -0700

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 .../main/scala/org/apache/spark/ml/feature/SQLTransformer.scala  | 4 +++-
 .../scala/org/apache/spark/ml/feature/SQLTransformerSuite.scala  | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/spark/blob/ab3363e9/mllib/src/main/scala/org/apache/spark/ml/feature/SQLTransformer.scala
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diff --git a/mllib/src/main/scala/org/apache/spark/ml/feature/SQLTransformer.scala b/mllib/src/main/scala/org/apache/spark/ml/feature/SQLTransformer.scala
index 259be26..b25fff9 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/feature/SQLTransformer.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/feature/SQLTransformer.scala
@@ -67,7 +67,9 @@ class SQLTransformer @Since("1.6.0") (@Since("1.6.0") override val uid: String)
     val tableName = Identifiable.randomUID(uid)
     dataset.createOrReplaceTempView(tableName)
     val realStatement = $(statement).replace(tableIdentifier, tableName)
-    dataset.sparkSession.sql(realStatement)
+    val result = dataset.sparkSession.sql(realStatement)
+    dataset.sparkSession.catalog.dropTempView(tableName)
+    result
   }
 
   @Since("1.6.0")

http://git-wip-us.apache.org/repos/asf/spark/blob/ab3363e9/mllib/src/test/scala/org/apache/spark/ml/feature/SQLTransformerSuite.scala
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diff --git a/mllib/src/test/scala/org/apache/spark/ml/feature/SQLTransformerSuite.scala b/mllib/src/test/scala/org/apache/spark/ml/feature/SQLTransformerSuite.scala
index 2346407..753f890 100644
--- a/mllib/src/test/scala/org/apache/spark/ml/feature/SQLTransformerSuite.scala
+++ b/mllib/src/test/scala/org/apache/spark/ml/feature/SQLTransformerSuite.scala
@@ -43,6 +43,7 @@ class SQLTransformerSuite
     assert(result.schema.toString == resultSchema.toString)
     assert(resultSchema == expected.schema)
     assert(result.collect().toSeq == expected.collect().toSeq)
+    assert(original.sparkSession.catalog.listTables().count() == 0)
   }
 
   test("read/write") {


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