[jira] [Commented] (HIVE-26227) Add support for Catalog related statements in HiveQL

["Denys Kuzmenko (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-26227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18016031#comment-18016031 ] 

Denys Kuzmenko commented on HIVE-26227:
---------------------------------------

hi [~wechar], how did you picture the catalog selection? For databases, we type "USE database_name";
USE catalog_name.database_name ?

> Add support for Catalog related statements in HiveQL
> ----------------------------------------------------
>
>                 Key: HIVE-26227
>                 URL: https://issues.apache.org/jira/browse/HIVE-26227
>             Project: Hive
>          Issue Type: Task
>          Components: Hive
>            Reporter: Wechar
>            Assignee: Wechar
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 4.1.0
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> Catalog concept is proposed to Hive 3.0 to allow different systems to connect to different catalogs in the metastore. But so far we can not query catalog through Hive ql, this task aims to implement the ddl statements related to catalog.
> *Create Catalog*
> {code:sql}
> CREATE CATALOG [IF NOT EXISTS] catalog_name
> LOCATION hdfs_path
> [COMMENT catalog_comment];
> {code}
> LOCATION is required for creating a new catalog now.
> *Alter Catalog*
> {code:sql}
> ALTER CATALOG catalog_name SET LOCATION hdfs_path;
> {code}
> Only location metadata can be altered for catalog.
> *Drop Catalog*
> {code:sql}
> DROP CATALOG [IF EXISTS] catalog_name;
> {code}
> DROP CATALOG is always RESTRICT, which means DROP CATALOG will fail if there are non-default databases in the catalog.
> *Show Catalogs*
> {code:sql}
> SHOW CATALOGS [LIKE 'identifier_with_wildcards'];
> {code}
> SHOW CATALOGS lists all of the catalogs defined in the metastore.
> The optional LIKE clause allows the list of catalogs to be filtered using a regular expression.
> *Describe Catalog*
> {code:sql}
> DESC[RIBE] CATALOG [EXTENDED] cat_name;
> {code}
> DESCRIBE CATALOG shows the name of the catalog, its comment (if one has been set), and its root location on the filesystem.
> EXTENDED also shows the create time.



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