add jdbc extra options parameter

README.md

@@ -11,6 +11,7 @@ Databricks output plugin for Embulk loads records to Databricks Delta Table.
 ## Configuration
 
 - **driver_path**: path to the jar file of the JDBC driver. If not set, [the bundled JDBC driver](https://docs.databricks.com/en/integrations/jdbc/index.html) will be used. (string, optional)
+- **options**: extra JDBC properties (hash, default: {})
 - **server_hostname**: The Databricks compute resource’s Server Hostname value, see [Compute settings for the Databricks JDBC Driver](https://docs.databricks.com/en/integrations/jdbc/compute.html). (string, required)
 - **http_path**: The Databricks compute resource’s HTTP Path value, see [Compute settings for the Databricks JDBC Driver](https://docs.databricks.com/en/integrations/jdbc/compute.html). (string, required)
 - **personal_access_token**: The Databaricks personal_access_token, see [Authentication settings for the Databricks JDBC Driver](https://docs.databricks.com/en/integrations/jdbc/authentication.html#authentication-pat). (string, required)

src/main/java/org/embulk/output/DatabricksOutputPlugin.java

@@ -91,6 +91,7 @@ protected JdbcOutputConnector getConnector(PluginTask task, boolean retryableMet
     props.put("SSL", "1");
     props.put("ConnCatalog", t.getCatalogName());
     props.put("ConnSchema", t.getSchemaName());
+    props.putAll(t.getOptions());
     logConnectionProperties(url, props);
     return new DatabricksOutputConnector(
         url, props, t.getTransactionIsolation(), t.getCatalogName(), t.getSchemaName());