Bool expression refactoring.

sqlbuilder/alias_projection.go

@@ -0,0 +1,34 @@
+package sqlbuilder
+
+import "bytes"
+
+type Alias struct {
+	Clause
+
+	expression Expression
+	alias      string
+}
+
+func NewAlias(expression Expression, alias string) *Alias {
+	if !validIdentifierName(alias) {
+		panic("Invalid alias")
+	}
+
+	return &Alias{
+		expression: expression,
+		alias:      alias,
+	}
+}
+
+func (a *Alias) SerializeSql(out *bytes.Buffer) error {
+
+	err := a.expression.SerializeSql(out)
+
+	if err != nil {
+		return err
+	}
+
+	out.WriteString(" AS \"" + a.alias + "\"")
+
+	return nil
+}