Add test for filtering on computed column with optional args

Author: benjie

__tests__/fixtures/queries/computedColumns.graphql

@@ -1,5 +1,6 @@
 query {
   computed_equalTo_test_computed: allFilterables(filter: { computed: { equalTo: "test computed" } }) { ...computedConnection }
+  computed_equalTo_test_computed_with_optional: allFilterables(filter: { computedWithOptional: { equalTo: "test default" } }) { ...computedConnection }
   computedIntArray_equalTo_2_20: allFilterables(filter: { computedIntArray: { equalTo: [2, 20] } }) { ...computedConnection }
   computedIntArray_equalTo_empty: allFilterables(filter: { computedIntArray: { equalTo: [] } }) { ...computedConnection }
   allFilterables_computedSetofChild_name_equalTo_child2: allFilterables { nodes { id, computedSetofChild(filter: { name: { equalTo: "child2" } }) { ...childConnection } } }

__tests__/integration/__snapshots__/queries.test.ts.snap

@@ -5433,6 +5433,13 @@ exports[`computedColumns.graphql 1`] = `
         },
       ],
     },
+    "computed_equalTo_test_computed_with_optional": {
+      "nodes": [
+        {
+          "id": 4,
+        },
+      ],
+    },
     "filterableById_1_computedSetofChild_name_equalTo_child2": {
       "computedSetofChild": {
         "nodes": [

__tests__/p-schema.sql

@@ -223,6 +223,10 @@ create function p.filterable_computed(filterable p.filterable) returns text as $
   select filterable."text" || ' computed'
 $$ language sql stable;
 
+create function p.filterable_computed_with_optional(filterable p.filterable, suffix text = ' default') returns text as $$
+  select filterable."text" || suffix
+$$ language sql stable;
+
 create function p.filterable_computed2(filterable p.filterable) returns text as $$
   select filterable."text" || ' computed2'
 $$ language sql stable;