[GitHub] [spark] gengliangwang opened a new pull request #24094: [SPARK-27162][SQL] Add new method getOriginalMap in CaseInsensitiveStringMap

[GitBox <gi...@apache.org>]

gengliangwang opened a new pull request #24094: [SPARK-27162][SQL] Add new method getOriginalMap in CaseInsensitiveStringMap
URL: https://github.com/apache/spark/pull/24094
 
 
   ## What changes were proposed in this pull request?
   
   Currently, DataFrameReader/DataFrameReader supports setting Hadoop configurations via method `.option()`. 
   E.g, the following test case should be passed in both ORC V1 and V2
   ```
     class TestFileFilter extends PathFilter {
       override def accept(path: Path): Boolean = path.getParent.getName != "p=2"
     }
   
     withTempPath { dir =>
         val path = dir.getCanonicalPath
   
         val df = spark.range(2)
         df.write.orc(path + "/p=1")
         df.write.orc(path + "/p=2")
         val extraOptions = Map(
           "mapred.input.pathFilter.class" -> classOf[TestFileFilter].getName,
           "mapreduce.input.pathFilter.class" -> classOf[TestFileFilter].getName
         )
         assert(spark.read.options(extraOptions).orc(path).count() === 2)
       }
     }
   ```
   While Hadoop Configurations are case sensitive, the current data source V2 APIs are using `CaseInsensitiveStringMap` in the top level entry `TableProvider`. 
   To create Hadoop configurations correctly, I suggest adding a new method `getOriginalMap` in `CaseInsensitiveStringMap`.
   
   
   ## How was this patch tested?
   
   Unit test
   

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