snowflake - group by all (#3644)

Author: mlorek

sql/snowflake/SnowflakeParser.g4

@@ -4200,6 +4200,7 @@ group_item
 group_by_clause
     : GROUP BY group_item (COMMA group_item)* having_clause?
     | GROUP BY (CUBE | GROUPING SETS | ROLLUP) LR_BRACKET group_item (COMMA group_item)* RR_BRACKET
+    | GROUP BY ALL
     ;
 
 having_clause

sql/snowflake/examples/select.sql

@@ -49,4 +49,7 @@ SELECT * FROM (VALUES (1), (2)) AS v1;
 SELECT * FROM (VALUES (1), (2));
 SELECT * FROM T1 SAMPLE BLOCK (1);
 SELECT * FROM T1 SAMPLE ROW (10 ROWS);
-SELECT * FROM splittable, LATERAL SPLIT_TO_TABLE(splittable.v, '.');
+SELECT * FROM splittable, LATERAL SPLIT_TO_TABLE(splittable.v, '.');
+
+with t as (select 1 as c, 2 as d)
+select * from t group by all;