fix(datatypes): add length to Postgres character type

lib/dialects/postgres/query-generator.js

@@ -101,7 +101,7 @@ const QueryGenerator = {
     }
     return 'SELECT pk.constraint_type as "Constraint", c.column_name as "Field", ' +
               'c.column_default as "Default", c.is_nullable as "Null", ' +
-              'CASE WHEN c.udt_name = \'hstore\' THEN c.udt_name ELSE c.data_type END as "Type", ' +
+              '(CASE WHEN c.udt_name = \'hstore\' THEN c.udt_name ELSE c.data_type END) || (CASE WHEN c.character_maximum_length IS NOT NULL THEN \'(\' || c.character_maximum_length || \')\' ELSE \'\' END) as "Type", ' +
               '(SELECT array_agg(e.enumlabel) ' +
               'FROM pg_catalog.pg_type t JOIN pg_catalog.pg_enum e ON t.oid=e.enumtypid ' +
               'WHERE t.typname=c.udt_name) AS "special" ' +

test/integration/query-interface.test.js

@@ -174,7 +174,7 @@ describe(Support.getTestDialectTeaser('QueryInterface'), () => {
           let assertVal = 'VARCHAR(255)';
           switch (dialect) {
             case 'postgres':
-              assertVal = 'CHARACTER VARYING';
+              assertVal = 'CHARACTER VARYING(255)';
               break;
             case 'mssql':
               assertVal = 'NVARCHAR';