feat(databricks-driver): Support for intervals and CURRENT_DATE for sql push down (#9000)

* add single intervals transformation for databricks

* add CURRENTDATE support for Databricks SQL Push down

Author: KSDaemon

packages/cubejs-databricks-jdbc-driver/src/DatabricksQuery.ts

@@ -186,6 +186,7 @@ export class DatabricksQuery extends BaseQuery {
 
   public sqlTemplates() {
     const templates = super.sqlTemplates();
+    templates.functions.CURRENTDATE = 'CURRENT_DATE';
     templates.functions.DATETRUNC = 'DATE_TRUNC({{ args_concat }})';
     templates.functions.DATEPART = 'DATE_PART({{ args_concat }})';
     templates.functions.BTRIM = 'TRIM({% if args[1] is defined %}{{ args[1] }} FROM {% endif %}{{ args[0] }})';
@@ -197,6 +198,7 @@ export class DatabricksQuery extends BaseQuery {
     templates.functions.TRUNC = 'CASE WHEN ({{ args[0] }}) >= 0 THEN FLOOR({{ args_concat }}) ELSE CEIL({{ args_concat }}) END';
     templates.expressions.timestamp_literal = 'from_utc_timestamp(\'{{ value }}\', \'UTC\')';
     templates.expressions.extract = 'EXTRACT({{ date_part }} FROM {{ expr }})';
+    templates.expressions.interval_single_date_part = 'INTERVAL \'{{ num }}\' {{ date_part }}';
     templates.quotes.identifiers = '`';
     templates.quotes.escape = '``';
     // TODO: Databricks has `TIMESTAMP_NTZ` with logic similar to Pg's `TIMESTAMP`