Gravitino supported Catalogs

The catalogs currently supported by the Gravitino connector are as follows:

• Hive
• Iceberg
• MySQL
• PostgreSQL

Create catalog

Trino itself does not support creating catalogs. Users can create catalogs through the Gravitino connector and then load them into Trino. The Gravitino connector provides the following stored procedures to create, delete, and alter catalogs. User can also use the system table catalog to describe all the catalogs.

Create catalog:

create_catalog(CATALOG varchar, PROVIDER varchar, PROPERTIES MAP(VARCHAR, VARCHAR), IGNORE_EXIST boolean);

• CATALOG: The catalog name to be created.
• PROVIDER: The catalog provider, currently only supports hive, lakehouse-iceberg, jdbc-mysql, jdbc-postgresql.
• PROPERTIES: The properties of the catalog.
• IGNORE_EXIST: The flag to ignore the error if the catalog already exists. It's optional, the default value is false.

The type of catalog properties reference:

• Hive catalog
• Iceberg catalog
• MySQL catalog
• PostgreSQL catalog

Drop catalog:

drop_catalog(CATALOG varchar, IGNORE_NOT_EXIST boolean);

• CATALOG: The catalog name to be deleted.
• IGNORE_NOT_EXIST: The flag to ignore the error if the catalog does not exist. It's optional, the default value is false.

Alter catalog:

alter_catalog(CATALOG varchar, SET_PROPERTIES MAP(VARCHAR, VARCHAR), REMOVE_PROPERTIES ARRY[VARCHAR]);

• CATALOG: The catalog name to be altered.
• SET_PROPERTIES: The properties to be set.
• REMOVE_PROPERTIES: The properties to be removed.

These stored procedures are under the gravitino connector and the system schema. So you need to use the following SQL to call them in the trino-cli:

Describe catalogs:

The system table gravitino.system.catalog is used to describe all the catalogs.

select * from gravitino.system.catalog;

The result is like:

     name     | provider |                                                 properties
--------------+----------+-------------------------------------------------------------------------------------------------------------
 gt_hive      | hive     | {gravitino.bypass.hive.metastore.client.capability.check=false, metastore.uris=thrift://trino-ci-hive:9083}

Example: You can run the following SQL to create a catalog named mysql with jdbc-mysql provider.

-- Call stored procedures with position.
call gravitino.system.create_catalog(
    'mysql',
    'jdbc-mysql',
    Map(
        Array['jdbc-url', 'jdbc-user', 'jdbc-password', 'jdbc-driver'],
        Array['jdbc:mysql:192.168.164.4:3306?useSSL=false', 'trino', 'ds123', 'com.mysql.cj.jdbc.Driver']
    )
)
call gravitino.system.drop_datalog('mysql');

-- Call stored procedures with name.
call gravitino.system.create_catalog(
    catalog =>'mysql',
    provider => 'jdbc-mysql',
    properties => Map(
        Array['jdbc-url', 'jdbc-user', 'jdbc-password', 'jdbc-driver'],
        Array['jdbc:mysql:192.168.164.4:3306?useSSL=false', 'trino', 'ds123', 'com.mysql.cj.jdbc.Driver']
    ),
    ignore_exist => true
)

call gravitino.system.drop_datalog(
    catalog => 'mysql'
    ignore_not_exist => true
);

call gravitino.system.alter_catalog(
    catalog => 'mysql',
    set_properties=> Map(
        Array['jdbc-url'],
        Array['jdbc:mysql:127.0.0.1:3306?useSSL=false']
    ),
    remove_properties => Array['jdbc-driver']
)

if you need more information about catalog, please refer to: Create a Catalog.

Passing Trino connector configuration

A Gravitino catalog is implemented by the Trino connector, so you can pass the Trino connector configuration to the Gravitino catalog. For example, you want to set the hive.config.resources configuration for the Hive catalog, you can pass the configuration to the Gravitino catalog like this:

call gravitino.system.create_catalog(
    'gt_hive',
    'hive',
    map(
        array['metastore.uris', 'trino.bypass.hive.config.resources'],
        array['thrift://trino-ci-hive:9083', "/tmp/hive-site.xml,/tmp/core-site.xml"]
    )
);

A prefix with trino.bypass. in the configuration key is used to indicate Gravitino connector to pass the Trino connector configuration to the Gravitino catalog in the Trino runtime.

More trino connector configurations can refer to:

• Hive catalog
• Iceberg catalog
• MySQL catalog
• PostgreSQL catalog

Data type mapping between Trino and Gravitino

Gravitino connector supports the following data type conversions between Trino and Gravitino currently. Depending on the detailed catalog, Gravitino may not support some data types conversion for this specific catalog, for example, Hive does not support TIME data type.

Gravitino Type	Trino Type
BooleanType	BOOLEAN
ByteType	TINYINT
ShortType	SMALLINT
IntegerType	INTEGER
LongType	BIGINT
FloatType	REAL
DoubleType	DOUBLE
DecimalType	DECIMAL
StringType	VARCHAR
VarcharType	VARCHAR
BinaryType	VARBINARY
DateType	DATE
TimeType	TIME
TimestampType	TIMESTAMP
ArrayType	ARRAY
MapType	MAP
StructType	ROW

For more about Trino data types, please refer to Trino data types and Gravitino data types, please refer to Gravitino data types.