gaborgsomogyi opened a new pull request #25418: [SPARK-28695][SS] Use 
CaseInsensitiveMap in KafkaSourceProvider to make source param handling more 
robust
URL: https://github.com/apache/spark/pull/25418
 
 
   ## What changes were proposed in this pull request?
   
   [SPARK-28163](https://issues.apache.org/jira/browse/SPARK-28163) fixed a bug 
and during the analysis we've concluded it would be more robust to use 
`CaseInsensitiveMap` inside Kafka source. This case less lower/upper case 
problem would rise in the the future.
   
   Please note this PR doesn't intend to solve any kind of actual problem but 
finish the concept added in 
[SPARK-28163](https://issues.apache.org/jira/browse/SPARK-28163) (in a fix PR I 
didn't want to add too invasive changes). In this PR I've changed `Map[String, 
String]` to `CaseInsensitiveMap[String]` to enforce the usage. These are the 
main use-cases:
   * `contains` => `CaseInsensitiveMap` solves it
   * `get...` => `CaseInsensitiveMap` solves it
   * `filter` => keys must be converted to lowercase because there is no 
guarantee that the incoming map has such key set
   * `find` => keys must be converted to lowercase because there is no 
guarantee that the incoming map has such key set
   * passing parameters to Kafka consumer/producer => keys must be converted to 
lowercase because there is no guarantee that the incoming map has such key set
   
   ## How was this patch tested?
   
   Existing unit tests.
   

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