pvk2727 commented on a change in pull request #25448: [SPARK-28697][SQL] 
Invalidate Database/Table names starting with underscore
URL: https://github.com/apache/spark/pull/25448#discussion_r314594157
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
 ##########
 @@ -102,7 +102,7 @@ class SessionCatalog(
   @GuardedBy("this")
   protected var currentDb: String = formatDatabaseName(DEFAULT_DATABASE)
 
-  private val validNameFormat = "([\\w_]+)".r
+  private val validNameFormat = "([a-zA-Z0-9]+[\\w]*)".r
 
 Review comment:
   and abiding by hive standard

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