[GitHub] [spark] HyukjinKwon commented on a change in pull request #25271: [SPARK-28536][SQL][PYTHON][TESTS] Reduce shuffle partitions in Python UDF tests in SQLQueryTestSuite

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HyukjinKwon commented on a change in pull request #25271: [SPARK-28536][SQL][PYTHON][TESTS] Reduce shuffle partitions in Python UDF tests in SQLQueryTestSuite
URL: https://github.com/apache/spark/pull/25271#discussion_r307951512
 
 

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 File path: sql/core/src/test/scala/org/apache/spark/sql/SQLQueryTestSuite.scala
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 @@ -279,6 +279,10 @@ class SQLQueryTestSuite extends QueryTest with SharedSQLContext {
 
     testCase match {
       case udfTestCase: UDFTest =>
+        // In Python UDF tests, the number of shuffle partitions matters considerably in
+        // the testing time because it requires to fork and communicate between external
+        // processes.
+        localSparkSession.conf.set(SQLConf.SHUFFLE_PARTITIONS.key, 8)
 
 Review comment:
   We could ..... I don't know lower than 8 is good enough though.. let's see if it really decreases the time first in Jenkins .. :-)

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