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https://issues.apache.org/jira/browse/FLINK-6574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012228#comment-16012228
]
ASF GitHub Bot commented on FLINK-6574:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3913#discussion_r116721391
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/catalog/ExternalCatalog.scala
---
@@ -34,41 +34,33 @@ trait ExternalCatalog {
/**
* Get a table from the catalog
*
- * @param dbName The name of the table's database.
* @param tableName The name of the table.
- * @throws DatabaseNotExistException thrown if the database does not
exist in the catalog.
* @throws TableNotExistException thrown if the table does not exist
in the catalog.
* @return the requested table
*/
- @throws[DatabaseNotExistException]
@throws[TableNotExistException]
- def getTable(dbName: String, tableName: String): ExternalCatalogTable
+ def getTable(tableName: String): ExternalCatalogTable
/**
* Get a list of all table names of a database in the catalog.
*
- * @param dbName The name of the database.
- * @throws DatabaseNotExistException thrown if the database does not
exist in the catalog
* @return The list of table names
*/
- @throws[DatabaseNotExistException]
- def listTables(dbName: String): JList[String]
+ def listTables(): JList[String]
/**
* Gets a database from the catalog.
*
- * @param dbName The name of the database.
- * @throws DatabaseNotExistException thrown if the database does not
exist in the catalog
* @return The requested database
*/
@throws[DatabaseNotExistException]
- def getDatabase(dbName: String): ExternalCatalogDatabase
+ def getSubCatalog(dbName: String): ExternalCatalog
/**
* Gets a list of all databases in the catalog.
*
* @return The list of database names
*/
- def listDatabases(): JList[String]
+ def listSubCatalog(): JList[String]
--- End diff --
+s `listSubCatalogs()`
> Support nested catalogs in ExternalCatalog
> ------------------------------------------
>
> Key: FLINK-6574
> URL: https://issues.apache.org/jira/browse/FLINK-6574
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: Haohui Mai
> Assignee: Haohui Mai
> Priority: Critical
> Fix For: 1.3.0
>
>
> We found out that the current external catalog requires three layers of
> references for any tables. For example, the SQL would look like the following
> when referencing external table:
> {noformat}
> SELECT * FROM catalog.db.table
> {noformat}
> It would be great to support only two layers of indirections which is closer
> to many of the deployment on Presto / Hive today.
> {noformat}
> SELECT * FROM db.table
> {noformat}
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