Github user carsonwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/9991#discussion_r45948964
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/ui/SQLListenerSuite.scala
---
@@ -343,6 +343,8 @@ class SQLListenerMemoryLeakSuite extends SparkFunSuite {
.set("spark.sql.ui.retainedExecutions", "50") // Set it to 50 to run
this test quickly
val sc = new SparkContext(conf)
try {
+ // Clear the sql listener created by a previous test suite.
+ SQLContext.clearSqlListener()
--- End diff --
Previously each `SQLContext` has its own `sqlListener`. Because now the SQL
events are posted to the event bus. All `SQLContext` now share a single
`sqlListener`. I don't think a user need clear `SQLContext.sqlListener`. This
is only used by the unit tests.
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