Type Cast Parentheses Problem (#152)

* Add support for CREATE DOMAIN

CREATE DOMAIN us_postal_code AS TEXT
CHECK(
   VALUE ~ '^\d{5}$'
OR VALUE ~ '^\d{5}-\d{4}$'
);

* Type Cast Parentheses Problem

Query:
SELECT * FROM kodsis WHERE create_date BETWEEN (CURRENT_DATE - 5)::DATE AND CURRENT_DATE

Deparser Result:
SELECT * FROM kodsis WHERE create_date BETWEEN CURRENT_DATE - 5::DATE AND CURRENT_DATE

Result is not same the original query. I fixed it.

New Deparser Result:
SELECT * FROM kodsis WHERE create_date BETWEEN (CURRENT_DATE - 5)::date AND CURRENT_DATE

lib/pg_query/deparse.rb

@@ -1159,7 +1159,8 @@ def deparse_typecast(node)
       if deparse_item(node['typeName']) == 'boolean'
         deparse_item(node['arg']) == "'t'" ? 'true' : 'false'
       else
-        deparse_item(node['arg']) + '::' + deparse_typename(node['typeName'][TYPE_NAME])
+        context = true if node['arg']['A_Expr']
+        deparse_item(node['arg'], context) + '::' + deparse_typename(node['typeName'][TYPE_NAME])
       end
     end
 

spec/lib/pg_query/deparse_spec.rb

@@ -519,6 +519,12 @@
         it { is_expected.to eq query }
       end
 
+      context 'with parentheses' do
+        let(:query) { "SELECT (1 + 3)::int8" }
+
+        it { is_expected.to eq query }
+      end
+
       context 'regclass' do
         let(:query) { "SELECT ?::regclass" }