Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20266#discussion_r161653251
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/FileBasedDataSourceSuite.scala ---
    @@ -0,0 +1,66 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
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    +
    +package org.apache.spark.sql
    +
    +import org.apache.spark.sql.test.SharedSQLContext
    +
    +class FileBasedDataSourceSuite extends QueryTest with SharedSQLContext {
    +  import testImplicits._
    +
    +  Seq("orc", "parquet", "csv", "json", "text").foreach { format =>
    --- End diff --
    
    instead of iterating all data source names and put the name in test name, 
can we create a base suite and create `ORCDataSourceSuite`, 
`ParquetDataSourceSuite`, etc.? It will be much easier if we wanna test more 
data sources in the future.


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