[feat] 丰富错误提示信息

builder_test.go

@@ -0,0 +1,10 @@
+package db
+
+import "testing"
+
+func TestJoinSub(t *testing.T) {
+	b := NewBuilder(conn)
+	b.Grammar = &Sqlite3Grammar{}
+
+	t.Log(b.On("Select 1 as a, 2 as b", "t1", "true").ToSql())
+}