Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12962#discussion_r62416413
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
 ---
    @@ -118,6 +118,9 @@ class SessionCatalog(
       }
     
       def dropDatabase(db: String, ignoreIfNotExists: Boolean, cascade: 
Boolean): Unit = {
    +    if (db == "default") {
    --- End diff --
    
    You are asking a very great question! Actually, I am not very sure how it 
works. 
    
    First, the current code base is not considering case sensitivity in 
database names. That part is missing. I think we should call `toLowerCase` for 
all the cases.
    
    Second, I saw we have a function `formatTableName` for formatting table 
names based on the configuration of `CASE_SENSITIVE`. However, the underlying 
Hive metastore is not case sensitive. See the document: 
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL
    
    My question is how to achieve the case sensitivity when using Hive 
metastore? also cc @yhuai 


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