Package path refactor.

alias.go

@@ -0,0 +1,39 @@
+package jet
+
+type alias struct {
+	expression Expression
+	alias      string
+
+	subQuery ExpressionTable
+}
+
+func newAlias(expression Expression, aliasName string) projection {
+	return &alias{
+		expression: expression,
+		alias:      aliasName,
+	}
+}
+
+func (a *alias) from(subQuery ExpressionTable) projection {
+	newAlias := *a
+	newAlias.subQuery = subQuery
+	return &newAlias
+}
+
+func (a *alias) serializeForProjection(statement statementType, out *queryData) error {
+	if a.subQuery != nil {
+		out.writeIdentifier(a.subQuery.Alias())
+		out.writeByte('.')
+		out.writeQuotedString(a.alias)
+	} else {
+		err := a.expression.serialize(statement, out)
+
+		if err != nil {
+			return err
+		}
+	}
+
+	out.writeString(`AS "` + a.alias + `"`)
+
+	return nil
+}