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https://issues.apache.org/jira/browse/FLINK-25684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17503297#comment-17503297
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Jark Wu commented on FLINK-25684:
---------------------------------
Sure. I will review it.
> Support enhanced show databases syntax
> --------------------------------------
>
> Key: FLINK-25684
> URL: https://issues.apache.org/jira/browse/FLINK-25684
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Reporter: Moses
> Assignee: Moses
> Priority: Major
> Labels: pull-request-available
>
> Enhanced `show databases` statement like ` show databasesfrom like 'db%' `
> has been supported broadly in many popular SQL engine like Spark SQL/MySQL.
> We could use such statement to easily show the databases that we wannted.
> h3. SHOW DATABSES [ LIKE regex_pattern ]
> Examples:
> {code:java}
> Flink SQL> create database db1;
> [INFO] Execute statement succeed.
> Flink SQL> create database db1_1;
> [INFO] Execute statement succeed.
> Flink SQL> create database pre_db;
> [INFO] Execute statement succeed.
> Flink SQL> show databases;
> +------------------+
> | database name |
> +------------------+
> | default_database |
> | db1 |
> | db1_1 |
> | pre_db |
> +------------------+
> 4 rows in set
> Flink SQL> show databases like 'db1';
> +---------------+
> | database name |
> +---------------+
> | db1 |
> +---------------+
> 1 row in set
> Flink SQL> show databases like 'db%';
> +---------------+
> | database name |
> +---------------+
> | db1 |
> | db1_1 |
> +---------------+
> 2 rows in set
> Flink SQL> show databases like '%db%';
> +---------------+
> | database name |
> +---------------+
> | db1 |
> | db1_1 |
> | pre_db |
> +---------------+
> 3 rows in set
> Flink SQL> show databases like '%db';
> +---------------+
> | database name |
> +---------------+
> | pre_db |
> +---------------+
> 1 row in set
> {code}
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