diff --git a/pegjs/snowflake.pegjs b/pegjs/snowflake.pegjs
index 4de13408..2e79ba96 100644
--- a/pegjs/snowflake.pegjs
+++ b/pegjs/snowflake.pegjs
@@ -2536,9 +2536,10 @@ where_clause
   = KW_WHERE __ e:or_and_where_expr { /* => binary_expr */ return e; }
 
 group_by_clause
-  = KW_GROUP __ KW_BY __ e:expr_list {
+  = KW_GROUP __ KW_BY __ e:(KW_ALL / expr_list) {
+    const columns = e === 'ALL' ? [{ type: 'origin', value: 'all'}] : e.value
     return {
-      columns: e.value
+      columns
     }
   }
 
diff --git a/test/snowflake.spec.js b/test/snowflake.spec.js
index c9a7b49a..496614ce 100644
--- a/test/snowflake.spec.js
+++ b/test/snowflake.spec.js
@@ -242,6 +242,13 @@ describe('snowflake', () => {
         'CREATE TABLE "1dog" ("id" INT)'
       ]
     },
+    {
+      title: 'group by all',
+      sql: [
+        'SELECT A, B, COUNT(*) FROM T GROUP BY All',
+        'SELECT "A", "B", COUNT(*) FROM "T" GROUP BY ALL'
+      ]
+    },
   ]
   SQL_LIST.forEach(sqlInfo => {
     const { title, sql } = sqlInfo