[GitHub] [spark] dongjoon-hyun commented on a change in pull request #29191: [SPARK-32364][SQL][FOLLOWUP] Add toMap to return originalMap

[GitBox]

dongjoon-hyun commented on a change in pull request #29191:
URL: https://github.com/apache/spark/pull/29191#discussion_r459225681



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File path: sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala
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@@ -361,7 +361,7 @@ class DataFrameReader private[sql](sparkSession: 
SparkSession) extends Logging {
       connectionProperties: Properties): DataFrame = {
     assertNoSpecifiedSchema("jdbc")
     // connectionProperties should override settings in extraOptions.
-    val params = extraOptions.toMap ++ connectionProperties.asScala.toMap
+    val params = extraOptions ++ connectionProperties.asScala

Review comment:
       `extraOptions ++ connectionProperties.asScala` will guarantee 
`connectionProoperties` overrides the `extraOption`. We added `++` operation 
for that~
   
   Also, `new JDBCOptions(url, table, params)` works like this. The passed 
`params: CaseInsensitiveMap` guarantees that JDBC_URL and JDBC_TABLE_NAME 
override `parameters`.
   ```
     def this(url: String, table: String, parameters: Map[String, String]) = {
       this(CaseInsensitiveMap(parameters ++ Map(
         JDBCOptions.JDBC_URL -> url,
         JDBCOptions.JDBC_TABLE_NAME -> table)))
     }
   ```
   
   The above code is for your logic.




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