HyukjinKwon commented on code in PR #43630:
URL: https://github.com/apache/spark/pull/43630#discussion_r1379454389


##########
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceManager.scala:
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@@ -20,35 +20,60 @@ package org.apache.spark.sql.execution.datasources
 import java.util.Locale
 import java.util.concurrent.ConcurrentHashMap
 
+import org.apache.spark.annotation.Unstable
 import org.apache.spark.sql.SparkSession
 import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
+import org.apache.spark.sql.catalyst.util.CaseInsensitiveMap
 import org.apache.spark.sql.errors.QueryCompilationErrors
 import org.apache.spark.sql.types.StructType
-import org.apache.spark.sql.util.CaseInsensitiveStringMap
 
+/**
+ * A manager for user-defined data sources. It is used to register and lookup 
data sources by
+ * their short names or fully qualified names.
+ */
+@Unstable

Review Comment:
   This too. Let's just remove this `@Unstable`.



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