cloud-fan commented on a change in pull request #29834:
URL: https://github.com/apache/spark/pull/29834#discussion_r496752829



##########
File path: 
sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkGetSchemasOperation.scala
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@@ -77,7 +77,8 @@ private[hive] class SparkGetSchemasOperation(
 
       val globalTempViewDb = 
sqlContext.sessionState.catalog.globalTempViewManager.database
       val databasePattern = 
Pattern.compile(CLIServiceUtils.patternToRegex(schemaName))
-      if (databasePattern.matcher(globalTempViewDb).matches()) {
+      if (schemaName == null || schemaName.isEmpty ||

Review comment:
       Given that changing from Hive behavior to JDBC standard is a very 
breaking change ('' is not wildcard anymore), I'd prefer to fix this small 
behavior for global temp view here.




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