HyukjinKwon commented on a change in pull request #25891: 
[SPARK-29203][SQL][TESTS] Reduce shuffle partitions in SQLQueryTestSuite
URL: https://github.com/apache/spark/pull/25891#discussion_r326899726
 
 

 ##########
 File path: 
sql/core/src/test/scala/org/apache/spark/sql/test/SharedSparkSession.scala
 ##########
 @@ -72,6 +72,8 @@ trait SharedSparkSessionBase
       // this rule may potentially block testing of other optimization rules 
such as
       // ConstantPropagation etc.
       .set(SQLConf.OPTIMIZER_EXCLUDED_RULES.key, 
ConvertToLocalRelation.ruleName)
+      // Reduce shuffle partitions to reduce testing time.
+      .set(SQLConf.SHUFFLE_PARTITIONS.key, "5")
 
 Review comment:
   I think I am hesitant since the affected scope is almost global. Let's see 
the test results first.

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