fix(cubesql): Fix TRUNC SQL push down for Databricks

Author: MazterQyou

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

@@ -194,6 +194,7 @@ export class DatabricksQuery extends BaseQuery {
     templates.functions.DATEDIFF = 'DATEDIFF({{ date_part }}, DATE_TRUNC(\'{{ date_part }}\', {{ args[1] }}), DATE_TRUNC(\'{{ date_part }}\', {{ args[2] }}))';
     templates.functions.LEAST = 'LEAST({{ args_concat }})';
     templates.functions.GREATEST = 'GREATEST({{ args_concat }})';
+    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.quotes.identifiers = '`';