viirya commented on a change in pull request #23628: [SPARK-26702][TEST] Create 
a test trait for Parquet and Orc test
URL: https://github.com/apache/spark/pull/23628#discussion_r250873312
 
 

 ##########
 File path: 
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/orc/OrcQuerySuite.scala
 ##########
 @@ -270,7 +270,10 @@ abstract class OrcQueryTest extends OrcTest {
   test("appending") {
     val data = (0 until 10).map(i => (i, i.toString))
     spark.createDataFrame(data).toDF("c1", "c2").createOrReplaceTempView("tmp")
-    withOrcTable(data, "t") {
+    // The test closure has side effect that changes table 't'. Running it 
without resetting
+    // the table data twice with vectorized=true and false will fail at the 
second time.
+    // Since it cares about inserting, we only do testing for vectorized=false.
 
 Review comment:
   Ok. Because the test closure has side effect, I can't use `withOrcTable` for 
it. I slightly change the test but keep original semantic.

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