Skip complex expression parenthesis wrap for function parameters.

mysql/expressions.go

@@ -87,7 +87,7 @@ var (
 	RawDate      = jet.RawDate
 )
 
-// Func can be used to call an custom or as of yet unsupported function in the database.
+// Func can be used to call custom or unsupported database functions.
 var Func = jet.Func
 
 // NewEnumValue creates new named enum value

mysql/select_statement_test.go

@@ -147,10 +147,10 @@ func TestSelect_NOT_EXISTS(t *testing.T) {
 				))), `
 SELECT table1.col_int AS "table1.col_int"
 FROM db.table1
-WHERE (NOT (EXISTS (
+WHERE NOT (EXISTS (
           SELECT table2.col_int AS "table2.col_int"
           FROM db.table2
           WHERE table1.col_int = table2.col_int
-     )));
+     ));
 `)
 }