Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/6042#discussion_r53744424
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameStatSuite.scala ---
@@ -269,3 +291,41 @@ class DataFrameStatSuite extends QueryTest with
SharedSQLContext {
assert(0.until(1000).forall(i => filter4.mightContain(i * 3)))
}
}
+
+
+class DataFrameStatPerfSuite extends QueryTest with SharedSQLContext with
Logging {
+
+ // Turn on this test if you want to test the performance of approximate
quantiles.
+ ignore("describe() should not be slowed down too much by quantiles") {
--- End diff --
minor: the name is not accurate before we add quantiles to `describe`.
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