shounakmk219 commented on code in PR #13544:
URL: https://github.com/apache/pinot/pull/13544#discussion_r1697929757


##########
pinot-common/src/main/java/org/apache/pinot/common/utils/DatabaseUtils.java:
##########
@@ -155,4 +157,18 @@ public static String extractDatabaseFromQueryRequest(
     String database = databaseFromHeaders != null ? databaseFromHeaders : 
databaseFromOptions;
     return Objects.requireNonNullElse(database, 
CommonConstants.DEFAULT_DATABASE);
   }
+
+  /**
+   * Extract the database name from the prefix of fully qualified table name.
+   * If no prefix is present "default" database is returned
+   */
+  public static String extractDatabaseFromFullyQualifiedTableName(String 
fullyQualifiedTableName) {

Review Comment:
   `fullyQualifiedTableName = <databaseName>.<logicalTableName>`
   and we allow the databaseName to be skipped or have `default` value for 
backward compatibility hence table name without database prefix is also a valid 
`fullyQualifiedTableName`



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